Yoga 2 Pro Need Previous BIOS

Hi folks,
I was wondering if anyone has the BIOS installer previous to the 76CN38WW.
I'm currently running the 76CN38WW and ever since I updated it, my wireless stops work "suddenly" (with no apparent reason).
In Lenovo's support site (http://support.lenovo.com/us/en/products/laptops-and-netbooks/yoga-series/yoga-2-pro-lenovo//downloa... the current BIOS (76CN41WW) is said to "Add security patch for UEFI". I have absolutely no interest on such feature, as I dual boot into Linux and it was a pain to make it boot after I upgrade to the 76CN38WW.
Just in case you ask yourselves, I tested the wireless in both Linux and Windows. So yes, I'm sure it's not an OS issue. I also replaced my wireless card twice to make sure it's not a hardware problem. The remaning alternatives are either the BIOS or motherboard. I do not believe in the motherboard because everytime I boot my computer (again, Windows or Linux, indifferently) the wireless works for a random period of time.
In Linux I get the following error from dmesg:
iwlwifi 0000:01:00.0: Failed to wake NIC for hcmd
iwlwifi 0000:01:00.0: Error sending REMOVE_STA: enqueue_hcmd failed: -5
iwlwifi 0000:01:00.0: Failed to remove station. Id=0
iwlwifi 0000:01:00.0: failed to remove AP station

BWT, Lenovo could improve the "change log" of the drivers/BIOS installers. Simply saying that "Latest version BIOS fixed all merged issues from previous" is insulting: we purchased the hardware, we are well aware of it's issues, it wouldn't hurt to tell us what exactly you are doing with the drivers/BIOS that influence our experience with our machines.
In my case, for example, Lenovo's "security patch for UEFI" is prohibiting me from doing what I want with my hardware. It ships with Windows, OK. But I'm not obliged to stick with it. I'm not asking for Operating System support either, simply want the hardware to work as it was supposed to.
NOTE: I'm saying that the UEFI patch is prohibiting me from doing what I want because last time I upgraded the BIOS it was a nightmare to boot back to Linux. I haven't installed the latest BIOS (76CN41WW) and I do not intend to unless I know exactly what it will do.

Similar Messages

Corrupt MBR on Yoga 2 Pro - Need advice

Hi,
I have tried to install dual-boot on my Lenovo Yoga 2 pro, but unsuccessfully. Once I gave up on the idea, I rebooted and Windows woudn't start, instead I am getting the following error:
Default Boot Device Missing or Boot Failed.
Insert Recovery Media and Hit any key
Then Select 'Boot Manager' to choose a new Boot Device or to Boot Recovery Media
(If I disable UEFI, then I get "Missing operating system")
Unfortunately I don't have a recovery disc.
According to a third-party repair tool I have on a USB, the MBR is corrupted, and all attempts at using the command prompt returned "command not found" (as the same 3rd party suggested I run "chkdsk C: /f") . Since the computer is new, I have no problem if all memory is wiped (there was hardly anything on it), but I'd really like to return to my original Windows configuration. Unfortunately, without any recovery disc, and as I don't have a product key for win 8.1, I'm not sure what are my options.
Any advice or suggestion, anyone?
Thanks!
Solved!
Go to Solution.

If you repaired the MBR and it will not boot this AM I would just take it back and exchange it. Chances are very good there is a problem with the harddrive.
Hoov
Microsoft MVP - Consumer Security
SpywareHammer.com

Lenovo Yoga 3 Pro Power bank

Hello, I have a Lenovo Yoga 3 pro and as we all know the yoga 3 pro has a disappointing battery life. I know i cant use a normal Power bank for ex. phones because the yoga 3 pro need 20v. Lenovo does not either sell a power bank that's compatible. So what can I do? I'm almost willing to build it my self, but I don't know which components i need.

Welcome to the Lenovo Community !
Sorry to hear of your problems. Since the adapter is making noise and getting hot I would recommend you discontinue using it until you get a replacement. Continued use may cause additional damage.
As far as why it happened, it is difficult to say. Most likely there is a short in the wiring if it is getting hot near the end. Possibly the wire had gotten twisted or bent or there is problem with the end piece itself.

Yoga 2 Pro Went DEAD After BIOS Update

Had a horrible experience .. with good ending ... when upgrading Bios for my Yoga 2 Pro. So I'd like to share with others. I bought my Yoga 2 Pro last June (Man 3/22/14) and love it! But, it had problem restarting automatically after Windows Update. At least 3 times (That I can recall. Did not use it briefly from June 30 - July 22), the screen reminding user not to shutdown after Windows the update would stay on until I manually powered it down and restarted it. Last July 23, it did again after Windows Update. Searched Lenovo web-site and found a Bios Update for Yoga 2 Pro (Win 8.1 64-bit). Downloaded the new Bios (dated July 11, 2014) and went through the instruction striclty. First of, the screen responses were not at all as detailed in the instruction. So, the instruction is not very good. Received 2 warnings: Make sure the laptop is connected to the charger during the procedure, and the bios is for Yoga 2 Pro ONLY do not install it on any other models. As part fo the procedure, the laptop switched to a Bios Utility program. Again received the aforementioned warnings. Update progress was shown on the screen. All of a sudden, then screen went blank and the keyboard stayed lit. Waited for about 30 minutes. Still the same. Press and held the power button down (not sure for how long) ... nothing! Just no response from the latop. Called Tech support. She (the tech support lady) said that ... it is not recommended for user to go through the BIOS upgrade! What? Then why post it on Lenovo.com? She also said that I should not have downloaded software from the internet and upgrade, especially for BIOS. Well, I told her that I did not download the program from ANY web-site, I downloaded it from LENOVO.com. She said further that looks like the BIOS update had damaged my mother-board, there is a problem with Win 8 & 8.1, and because it was my own doing ... the damage would not be covered by the warranty! Considering the circumstance, Lenovo would waiver the initial $99 fee to assess the damage, but I would have to pay for any repair costs. In any case, I was so fumed at Lenove Tech Support responses that I hung up. close my laptop and put it aside. Almost 24 hours later, when the battery drained completely, I connected the laptop to the charger, press the power button to turn it on ... and ... to my surprise, the laptop booted and everything came back normal! The last (7/25) auto restart seemed to go well. Not sure if the auto restart problem is fixed with the new BIOS, but it seems to be. Time will tell.

Thank you for your posting. I searched the net when I ran into the problem, but could not find any help. Obviously, my search was not exhaustive. I was trying to make the following: a. Lenov should be more specific in their BIOS update instruction. Their instruction was ... far ... far from reality. b. Lenovo tech assistance was ... not much help. After listening to the description of my prolem, the tech lady immediately said that the operation must have damaged the mother-board, and that the operation is not ... recommended. No guidance on draining the battery a or how to restart the machine, etc... What I received was confusing that caused more panic! As a note, I had done BIOS upgrade on DELL PC/laptop before w/o any problem. I fully understand the implication of a BIOS upgrade, but trusted that manufacturer fully tested whatever that they post in their web-site. Oh well, live ... and learn! All in all, the Yoga 2 Pro is a great machine and I love it! Hope that anyone who runs into the same problem will be able to get the needed help in time! Cheers,

Yoga 2 Pro : BIOS Update on a clean Windows 8.1 Pro install

Hi,
I recently bought the Yoga 2 Pro. Like everybody I have the yellow problem.
After buying it, I reinstalled my computer with a fresh Windows 8.1 pro install.
I was wondering if anybody has already tried updating the BIOS on a clean Windows 8.1 install ?
And also if there is any reported bug with the BIOS update.
I already crashed a while back one of my previous computer and I would prefer if this don't append again
Thanks,
Best,

Not, i'm speaking about the BIOS update. The windows 8.1 pro installation was fine.

Yoga 2 Pro BIOS UI corrupted after clean install Win 8.1 Pro

Hi all.
First of all sorry for my bad English.
And here is my problem:
I just bought a new laptop "Yoga 2 Pro". Because I have a legal copy of Windows 8.1 Pro I decided to reinstall the system. Before re installing BIOS UI looked normal but after re installation of the operating system BIOS UI looks strange and can not use it. You can see it on the attached photos. I tried to reinstall the system a few times but immediately after installation BIOS UI looked like in the pictures. Interesting that after removing system from SSD, BIOS UI is starting to look normal and is fully functional. I even tried different versions of the operating system because I thought that the cause lies with the ISO file. The effect has always been the same.
Does anyone have any idea what might be causing this problem?
I will be grateful for any suggestions.

I did try removig the Lenovo energy management software, but that didn't work. I also then reinstalled and tried setting it to Performance mode. However, I didn't look for a Windows power mgmt solution.
What's weird is that after I powered down and used the Novo button to check the BIOS version (just to confirm what I said earlier), when I restarted Windows again I did not see the Hyper-V error message. I haven't restarted again, but will check again tomorrow morning when Windows starts again.

I need help with finding right stylus pen for lenovo yoga 2 pro!

I did read other person's post, but I did not find my answer. I am currently using my fingers to write my notes and it drives me nuts! I do have a stylus pen that have huge round fabric tip. It does not write well. I want a stylus pen with pointy end so I can acturally take my notes on OneNote. I writes equations down so it is very hard to write small and neat with my hand. I do know that my laptop is touch sensitive so it only works with rubber or fabric tips! I could not find any stylus pen with those tip that are pointy.... I need help on finding pointy tipped stylus pen that will let me write well. I am ordering ati-glare screen protector because I can see myself on the screen like a mirror... lol Hopefully this will not keep me from finding a pen that works well! Please give me link to the pen, if you can! Thank you for reading!

ColonelONeill is correct.
The Yoga 2 Pro does not have a digitizer, so a capacitative stylus, which mimics a fingertip, is what you'd need.
Regards.
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Yoga 3 Pro BIOS Update A6CN47WW

Someone knows whats better with this Bios Update?
Solved!
Go to Solution.

According to the support site:
Summary of changes
==================
General Information:
A6CN47WW
1. Add security patch for UEFI
2. Support 5Y71&5Y51
Source: http://support.lenovo.com/us/en/products/laptops-and-netbooks/yoga-series/yoga-3-pro-1370-laptop-len...
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A31/i1600/G40/R50p/R61i/S30/SL510/2*T22/4*T4x/11*T6x/6*T4x0x/6*T5x0/3*W5x0/W700/3*X2x/4*X3x/3*X4x/5*X6x/3*X6xT/10*X2xx/2*X200T/4*X30x/Z60m/3*Z61x
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Solved! Fix / Repair Nova Button / One Key Recovery after replacing SSD - Walkthru! Yoga 2 Pro

I created this full walkthru for people who upgrade / or replace their hard drive / SSD drive on the Lenovo Yoga 2 Pro or other Lenovo products that has the Nova button - One Key recovery solution. I did this on my Yoga 2 Pro. So it should work perfectly for those owners for others I'm not certian but it should be similiar for other Lenovos.
Essentially this will rebuild your laptop back to factory settings including full nova button functionality without having to buy the lenovo recovery disks. It took me several days to piece this together from everything on the web into an easy to follow step by step process so I hope you appreciate / enjoy it And I hope it saves you lots of time.
The process is not that hard but you are completely wiping your hard drive yourself. All your data will be gone. Bear this in mind. You have to be bold enough to try it. And it's not for the faint of heart.
Read through the whole thing first before doing it step by step.
Here we go.
There are a lot of steps but it's a fairly simple process.
Requirements at least 2 USB sticks - One 4 GB or more
Necessary Files:
1. Okr8 Engineer - Wipes the hard drive and creates the necessary paritions to bring Lenovo drive back to initial state.
This is the file you really need.
Download here:
http://www.filedropper.com/win8okr80withoutos > my personal upload <
https://torrent.pl/de/0438900090510,lenovo-okr8-one-key-recovery-8 or do a search for OKR8.
2. Power Iso - Properly burns Okr8 on a bootable USB for installation purposes.
http://www.poweriso.com/
3. Download copy of Windows 8.1 OEM version - Wish I had found this link before!
http://windows.microsoft.com/en-CA/windows-8/create-reset-refresh-media
For the Yoga Pro 2 you do not need the Windows 8.1 serial as it's imprinted directly onto the bio for others laptops laptops. Use produkey to find you're serail if you lost it you don't have a Bio embedded laptop: http://www.nirsoft.net/utils/product_cd_key_viewer.html
4. Get Necessary Lenovo Drivers - Easily accessible on the Lenovo website. Just go and download the drivers you need for you laptop.
Links to hard to find drivers
Veriface 4.0 : https://forums.lenovo.com/t5/Yoga-Flex-Laptops-and/Veriface-Download/td-p/1459391
Dolby v4 : http://support.lenovo.com/us/en/downloads/ds027444
First section:
1. Download the OKR8 file. You'll need to install utorrent or bitorrent if you downloaded it as a torrent and not my personal file.
2. Download, Install, then Open PowerISO.
3. Select - Tools - Create Bootable USB drive - Select Yes to Run as administrator - Find the OKR 8.iso on your hard drive and burn to the USB stick.
4. Next create the windows 8.1 usb stick as well. Download Windows 8.1: http://windows.microsoft.com/en-CA/windows-8/create-reset-refresh-media
5. Run the Microsoft file and select English > Windows 8.1 and > 64 bit
6. Burn the Windows 8.1 to USb through the software.
7. Relax and have a coffee while it creates the usb stick.
8. Download and save the necessary lenovo drivers onto another USB stick, external hard drive or onto one of the 2 USB sticks you are already using. Valuable if you only have one computer.
Please note: You install all this stuff at your own risk. Propertly back up and save all your old personal data first onto an external hard drive. This process will wipe everything off your drive, including all the paritions (including the old recovery parition if you have one there) and you'd won't be able to get it back.
Having access to two computers is helpful. But if done property you should be good with one. I will not be responsible for any mishaps. This is cowboy computing. Typically for people with too much time on their hands or who are obsessive compulsive types
Second section:
1. Turn off computer.
2. Press Nova button, wait, enter into Bios. Goto to boot mode and switch boot from UEFI only to 'legacy mode". This allows you to boot to the OKR 8 USB your prepared.
3. Shut down computer
4. Insert OKR 8 USB
5. Press Nova button again - Select Boot- Select - USB drive with OKR 8 on it.
6. Let the OKR 8 USB load. - A Windows 8 screen comes up.
7. Once it loads click the check mark and hit the button with chinese letters. This whole software is in Chinese and not in English. Don't worry.
8. Wait patiently. It will say 'done' but it's not all done until the popup windows appears and says All Done. Then REMOVE the usb and reboot.
9. Important* - Reboot the computer and let the OKR 8 software load and install on the recovery parition - It finishes the installation after you reboot. It will reboot again and load into the One Key Recovery Panel software.
Yay! Now select shutdown from the One Key Recovery environment.
10. Press Nova button again > enter bio > and switch back to UEFI mode. *Important* If you try to install Windows through USB legacy mode. You will get a GPT error when trying to install windows onto the hard drive.
11. Shutdown again.
12. Insert the Windows 8.1 USB. Press the Nova button again. Select Boot Options: Boot from the Windows 8.1 USB.
13. Windows 8.1 loads. Select Install.
14. Choose Custom Install and Install Windows 8.1 to Parition 5 - "Windows8_OS"
15. Let Windows Install. Remove USB stick when asked.
16. Reboot. Go through standard windows setup. Install all drivers and program you want in preparation to save the intial factory recovery state.
17. Get your yoga 2 pro or laptop up to the initial specifications you want and then shut down.
Section 3:
1. Now it's time to create the initial backup onto the hidden recovery parition so you can reset the laptop back to inital specs whenever you wish including when you want to sell or give away the laptop..
2. From a shutdown state - Goto system recovery through novo button again.
3. Once it's loaded press CTRL+Shift+O to pull up the command prompt window (Shift + F10 was previously suggested. It did not work for me, maybe on older machines)
4. At the command prompt type in: diskpart
5. type: list volume
6. Look for the letter of volume that is labelled PBR_DRV (eg. H) - This is the hidden Lenovo recovery partition where the initial factory backup image will be saved to.
7. type exit
8. type: H: or whatever volume it is.
9. Your directory should change to H:
10. Type: cd onekey\osimage > This takes you to the correct directory.
11.. You're almost at the end!
12.. Type: osimage /nopbr
13. Type: osimage /fb
14. Wait ten minutes while the initial backup is saved onto the hidden recovery parition
15.. Profit!
16. type exit - Reboot - You're Good to Go.
17. Rock On!
18. Enjoy Life again.
Lots of work but worth it in the end !
Should also work for when windows 10 comes out.

As far as I can tell, Windows 8.1 is merely an windows update, so the license key from your BIOS should still work. If you already updated your machine to Windows 8.1, and a fresh install of 8.1 didn't complain about license key, then you should be able to create a new recovery image from it. For Windows 10, if I am not mistaken, when you upgrade from Windows 7/8/8.1, some hardware ID is stored on a MS server to flag this machine has a windows 10 license, to make it possible to perform fresh windows 10 install in the future if needed. This means if you never have windows 10 installed, then you cannot use it to build the recovrey image (the key from BIOS won't work). But if you have 10 installed, you can always activate it during the process of creating recovery image. Once again, all these are based on my knowledge and I haven't attempt to do them, so I cannot tell if this will definitely work. Try it and let us know

Yoga 2 Pro - Keyboard Not Working

My issue is that the keyboard of my Lenovo Yoga 2 Pro disables itself intermittently in Laptop Mode. I purchased this laptop (i7 cpu, 256GB SSD, 8GB memory) from BB a week ago and get it replaced twice (3 different units) and all had the same issue. Case of the first one I purchased was also cracked on the rear side. I powered the laptop to test it before I return it. Then I realized this keyboard issue. I was using it in laptop mode and keyboard backlight was going off by itself. First I thought it was just the backlight but keys were not functioning as well. Touchpad and Touchscreen were still functional. Time to time keyboard came back to life by itself and sometimes I needed to restart couple of times to get it work.
Next day I went to another BB store to get it replaced (the one I burchased was the last unit in other store). So I also got the last unit in this other BB store and went to school. After my classes I realised this one had the same keyboard issue. I checked if I had latest BIOS, drivers and software and updated everything. But there was no solution. I called lenovo tech support and the guy on the phone told me that it seems like a hardware issue and suggested me to get it replaced again via BB. I didn't think that it was a hardware issue. It seemed to me like the sensors drivers or firmware were thinking that I put the yoga in tablet mode and was disableing keyboard even in laptop mode. I tried uninstalling yoga software , disabling services such as YMC and intel thermal and power management from bios etc. etc. These things seemed to lower the number of issues but still keyboard was disableing itself time to time.
I went BB again to get another one. But of course I had to find another store that have the exact same model (and of course they had only one unit). I went and get that one. Guess what? It is same. I tried everythin. Installed my own copy of Windows 8.1 Pro and didn't install any lenovo software etc. Didnt work. I recovered to factory OS still same. I called lenovo tech support again to find some help. Only thing they could recommend me was to send the laptop for repair but I can not simply live without computer (I am computer science PhD. student need it access to a computer all the time).
I like the laptop so much and honestly I couldn't find another brand model with very high resolution screen i7 processor at least 8gb memory and 256GB ssd etc at this priice range. So I want to be able to use it. But every other minute or hour the keyboard disables itself. With the latest unit I got moving the lid (pushing and pulling screen back and forth) seems to help sometimes. Also tilting the laptop some times works.
Is there anyone else having this kind of issues? And more importantly is there anyone who managed to solve it?
I do not want to talk to tech support again. If possible I want to get in touch with some people from Lenovo software and drivers team so that I can help them diagnose the issue and test beta software firmware they might have.
PS: Why no bios/driver update for last couple of months?

As stupid as it sounds, try folding the laptop fully into tablet mode, then fold it back to regular mode. This has been working for one of my clients.
NOT a driver issue - definitely a physical issue. Hopefully the folding back/forth continues to work.
(and since I'm a support resource, this kind of stuff makes me look bad when I recommend it to a client: "Yes, it is possibly the coolest laptop available on the market, but you just have to deal with a few issues like keyboard randomly stopping working and the wireless driver load intermittently not working after waking the laptop up. Other than those two minor issues, it's a great laptop!!"

Yoga 3 pro : problem connecting to HD TV with micro/mini HDMI to HDMI

I purchased a YOGA 3 PRO (512GB) and couldn't be happier with how light and slim this jewel is. The CPU works fast and overall it's a gret UltraBook.
BUT
I just can't connect my Yoga 3 Pro to my TV. I purchased this Ultra Book at BEST BUY (this model is apparently an "exclusive" of Best Buy), and since I knew i need to connect it to an external monitor to do real work on photoshop, I also purchased an INSIGNIA micro-HDMI to HDMI cable.
As shown below, my 32" HD TV (one of the latest models from LG / ref. 32LB5800) is recognized by Windows 8.1 and the INTEL HD Graphics 5300 Display driver (which i updated to the latest version 10.18.10.3960), but unfortunately the TV says "NO SIGNAL".
Link to image
I've tried to connect the Insighnia mini-HDMI to HDMI cable in all 3 HDMI inputs on my TV, but same pathetic result. The first input is HDMI ARC, the second one is regular HDMI and the third one is for mobile devices (HDMI MHL), but all 3 returned the same "NO SIGNAL".
So I figured maybe it was the TV. Thus i plugged my Yoga 3 Pro to a Pioneer Plasma TV that was about 3-4 years old, straight to one of HDMI inputs and same thing, no image. However, Windows 8.1 found the TV and even suggests the ideal resolution.
In both cases the TV model was found by Windows 8.1 and shown under the "Screen Resolution" menu. I selected "Extend these displays" to use the TV as a main monitor, but of course this doesn't help the case.
So i started digging this forum and read a lot of coomplaints about the previous version of the YOGA PRO and that the micro-HDMI plug was poorly designed and the cable connector needed to be "trimmed" a little by 1mm or so to allow it plug fully into the port. So i tried that too, and even though i succesfully removed 1mm of rubber around my Insignia cable connector, it didn't help whatsoever since apparently, the new YOGA 3 PRO doesn't have this issue any longer, its design solved indeed that weakness of its predecessor.
So I'm asking: what the hell is the problem then? it's driving me crazy. I've literrally spent the past 6 hours trying to figure it out, but without any success. This forum has ZERO post about a problem of connection of a YOGA 3 PRO to an HDTV. I know it's a very recent model, but still, I can't believe to be the only one experiencing this issue.
If I don't find a solution quickly I'm afraid I'll have no other choice but to return it. It's unbelievable that both the latest iterations of the LENOVO YOGA PRO are having issues (likely different) connecting to an HD TV using the mini/micor HDMI port.
Not sure if this is a hardware or software problem, but LENOVO better get their act together and fix this stat!
UPDATE: i also noticed that when the cable is plugged into the micro-HDMI port, there's no more sound on the ultrabook. I played a video while the cable was plugged in and NO SOUND. I'm not sure if this is normal or not. I would assume connecting the Yoga 3 Pro with the cable into the TV makes it believe that the sound shall be directed towards the TV now, hence the disabled sound on the Ultrabook, even though on the receiving side, the TV still doesn't get any signal from that cable, neither video nor audio.
Moderator note: large image(s) converted to link(s): About Posting Pictures In The Forums
Solved!
Go to Solution.

well it turned out the culprit was the INSIGNIA Micro-HDMI to HDMI cable sold by Best Buy. I tried another cable brand and now it's working just fine! Go figure...

Yoga 2 Pro: Touchpad doesn't disable in Tablet or Stand

When I flip to tablet or stand mode (i even get the toast notification that it's switched), the touchpad doesn't disable. I am still able to move the pointer and click. The keyboard however is disabled.
I have installed the bios update, energy manager thing, and latest firmware from Synpatics.
Anyone else have this issue?
Solved!
Go to Solution.

indest wrote:
Cleo_Lenovo wrote:
Just would like to share my view here. Customers are always advised to use Lenovo's drivers because they have been re-packaged to fit to Lenovo machines.
At times, the Lenovo driver comes with serious bugs that never gets fixed. The trackpad and wifi driver are perfect example of such drivers. Do you know how sad it is that I am using a DELL trackpad driver on my Yoga?
Trackpad issue: http://forums.lenovo.com/t5/Idea-Windows-based-Tablets-and/Yoga-2-Pro-TouchPad-Deselects-Selection-I...
Wifi issue: http://forums.lenovo.com/t5/Idea-Windows-based-Tablets-and/Re-Yoga-2-Pro-Wifi-Problems/td-p/1452437 (84 pages -.-)
Hi indest,
I understand you and the users frustration. I agree that sometimes things just do not work as they should. Anyway, thanks for bringing up the issues. I'll need to check into the trackpad thread before escalate this case in full to engineering.
In regard to the WiFi issue, we had escalated this case much earlier but due to this model comes with different wifi card as well as situation changes based on different routers used, it was very difficult for the enginering team to pin point out the real root case. I'm sorry that it haas been dragged this long. But based on the information I have currently, our engineering team is testing on a beta driver provided by Intel and we're also trying to get affected machines as a sample for our further analysis. I'll need to catch up with a few folks in regard to this issue.
Best regards,
Cleo
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Yoga 2 Pro Tent Mode/Mode Switch Issues

Hi, I can't get my lenovo yoga 2 pro to go into tent mode. In fact, the screen won't even do a full 180 degree flip, but it will do a 90 degree flip to vertical (so I know the screen flip is working to a degree). Further, when switching to tablet mode, it says that it is in stand mode. Any thoughts? Thanks,Spencer

i had this problem out of the box. The sensor which tells the Yoga which mode it is in and which way up was not working properly so that the screen was at 90 degrees to the right way up and it said tent when in tablet; laptop in tablet etc. Researched it and saw that someone had resolved it by installaing Windows updates - but couldnt get Windows Update to work - it either found no updates or failed on install. I found that I needed to install updated drivers from the Lenovo support site (not sure which one did it, but it included a BIOS update, display driver and others), which then allowed Windows update to work. Installed all outstanding updates and it now senses correctly.

Yoga 2 Pro, Etekcity 16Ah power bank and some additional measurements

Hello guys, this would be my short review of Etekcity Wingman external battery I use with y2p. As you know, the y2p battery performance is a little disappointing for a Haswell ultrabook (at least for some), so it's a good idea to have some additional external battery beforehand. After some research I found the interesting candidate, the 16.000 mAh external battery manufactured somewhere in chinese factory (Shenzen?) and then being sold under many different brands (I found at least 5 of them on Amazon). I bought the Etekcity Wingman, as it was the cheapest, for 69$
No links here, but you will find it easily. It has a classy aluminium shell, very good overall build quality, features 5V USB output and additional 12, 16 and 19V outputs with many different plugs. There is no rectangular Lenovo Yoga tip, but in the package you can find the Lenovo X1 big circular plug. So you need an additional converter Cable Adapter from Lenovo, part no. 0B47046 and voila, everything fits.
This external battery can provide up to 19V and as you are aware, y2p needs 20V. But this is not a problem, it's only 5% difference and nothing to be worry about. As to the amperage, the battery can provide max 3A at 19V and y2p original power adapter is rated at 3.25A - but this is not a problem either, as during my actual measurements I never saw the current more than 3A (more about it later).
16.000 mAh for li-po cells 3,7V gives about 59Wh of power capacity and this is important. The internal y2p battery is rated 54Wh, so 'theoretically' the external battery should more than double our y2p working time. Well, theoretically, because: 1. as for chinese products they almost always overrate battery specs 2. there is a limited efficiency for internal voltage conversion inside the battery electronics, so there are some losses (heat).
So, what is the REAL capacity of this thing?
I did a test. I depleted internal y2p battery to 20% and then I plugged in the Etekcity Wingman, set at 19V. It was able to charge the WORKING laptop for 1 hour and 25 minutes and y2p battery charged from 20% to 85% before the Wingman shut down. It was a little warm while working, but not hot at all (aluminium shell dissipates heat very good).
What it means is that this external battery was able to provide about 2/3 (65%) of total internal y2p battery capacity and during that time the laptop was working consuming additional energy from the Wingman (70% brightness, wifi/BT on, some light browsing, nothing demanding). I am estimating that if the y2p was depleted completely and shut down, then the external battery would be able to charge it to about 80-85%. I find this result pretty good.
So if you are able to achieve some 6.5h on internal y2p battery, this external battery gives you another 5h more, for total 11.5h working time out of the socket. Not bad.
I have a laboratory digital power source, so I was able to do some additional interesting measurements (thanks to the cables and adapters):
1. The Yoga 2 Pro starts charging at about 16.5V voltage level(!) Anything lower - it won't charge, higher - it will (no BIOS warnings whatsoever).
2. The charging current for non-working laptop is about 1.6A (I did not set quick charge at Energy Manager).
3. 70% brightness, "daily" power mode, wifi/BT on, keyboard lighting on and doing some lazy internet browsing needs about 470mA of current (averaged, idle is about 415 mA, as each wifi activity creates current jumps). For 20V it gives 9.4 Wh of power consumption and for 54Wh y2p internal battery it gives about 5h 45min of working time. Lets set this situation as a "base" level.
4. Same as above, but power mode changed to "stable". Yellow turns mustard, but brightness intensity remains at 70%. The current goes down to about 420mA (50mA less!). It gives you additional 40 minutes for a total 6h 25min of working time.
5. Same as above, but keyboard light is off. About 20mA of savings, + 15 min for a total 6h 40 min
6. Same as above, airplane mode (wifi/BT off) - another 20mA of savings (not much), but there are no wifi current spikes so it's like idle mode - about 330mA of current consumption, giving about 8h 15min of working (word editing etc.)
7. Same as above, 50% brightness (still pretty usable) - 305mA for a total 8h 50min of working time.
8. Same as above, but with 16.000 mAh external battery - well, you figure it out (+80%)
Happy New Year!

20V/3.25A means that if looking for an external power bank for your y2p the voltage must be exactly 20V and the amperage must be 3.25A or more (3.25 is minimum value). These are perfect values.
But in real world some little deviances are permissible, like 5%. 19V and 3A are examples and I made sure that my external battery rated 19V/3A works good with Yoga 2 Pro. There are more 19V external power banks than 20V models out there and I've chosen my Wingman battery because it was really cheap. But it is always better to find one that meets voltage/amperage ratings perfectly.
The Energizer XP18000 would be a perfect choice, because it can provide 20V/3.5A. But I dont know if the Lenovo plug is inside the package. And it's expensive.
The "big circular plug" is 7.9 x 5.4 x 0.9mm plug for some other Lenovo machines, like Carbon X1. I never found an external power bank with "rectangular" y2p plug anyway.

Yoga 2 Pro (Win 8.1) wifi adapter go missing once a while

Dear Yoga 2 Pro fans,I'm sharing my fix here. I'm a device driver/firmware s/w developer so I know a few things My Y2P (bought in April 2014) works fine except that the Wifi adapter need to be disable/enable (via Ctrl Panel->Networks) to make it find my wifi router after power up, or after wake up from sleep. I've been living with this product defect but tolerable, and the wifi speed and stability is normal. I only use Y2P in laptop mode.I was using :* Intel(R) Wireless-N 7260, driver 11/17/2014 v17.13.2.2 (was update via 'Update Driver...' button in the Driver Properties), -- "Allow..device to save power"=checked, -- Advanced tab's U-APSD Support = Enabled* Intel Smart Connect (ISCT) is installed but turned off* Intel PROSet/Wireless Tools v17.14.0* BIOS was 76CN38WW Until 2 weeks ago, I updated the N7260 wifi adapter driver to12/16/2014 v17.13.12.1 (was update via 'Update Driver...' button in the Driver Properties), and hell broke loss... The wifi adapter will go missing randomly, i.e. midway when transfering files in the LAN, or after power up from shutdown, or after return from sleep. Subsequent shutdown and power on will not recover the missing N7260 wifi adaptor !! No overheating issue as I was using battery at 60% full.And more strange, I leave Y2P over night, or a couple of hours, and the N7260 wifi adaptor appear (be detected by Win8.1) the next morning....Bluetooth is always working and no problem. After spending one day, reading both Lenovo and Intel N7260 forums, I think I solved it but it wasn't easyas there are many combinations. Here's my final config* BIOS is 76CN43WW 5/5/2015, with Lenovo Fast Startup = Disable* Intel Smart Connect (ISCT) - uninstalled with Control Panel > Programs* Intel PROSet/Wireless Tools v17.14.0 - uninstalled with Control Panel > Programs* While N7260 wifi adaptor is in 'missing' state, via Dev Mgr > View > Show hidden devices -> Uninstall drivers & remove files, and reboot Y2P* Download from Lenovo Support Y2P and install 13kd018f.exe (while N7260 wifi adaptore is in 'missing' state), shutdown and wait for 1-2 hours.* Power up, and hopefully N7260 re-appears, check via Devi Mgr -> Intel(R) Wireless-N 7260, driver 5/26/2014, 17.0.3.3 -- "Allow..device to save power"= Unchecked, -- Advanced tab's U-APSD Support = Disable -- Power provide set Max Performance on Battery and Plugged-In I've used this for a day and is stable, will monitor more, and report back !

Ok, the above doesn't work, but at leas the Wifi adapter now consistently disappear the 2nd time when Y2P boots up after a shutdown or from sleep. I've brought it to Lenovo Service Center (Shenzhen), and found it's h/w issue, both the Wifi card has to be replaced as well as the 'sound card' that has connectors to hold the wifi card to the motherboard Checking fee: CNY 50Wifi card: CNY 380Sound card: CNY 280Cleaning fee: CNY 50 Gee.. my Y2P is just 2 months past the 1 year warranty

Yoga 2 Pro Need Previous BIOS

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