ThinkPad t420 cant power on after some water...

An accident happened today morning. I was drinking above my laptop and accidently some juice is spilled into the keyboard of my T420. After that I plugged out the AC and removed the battery immadiately. It dried out and I tried to power it on. The windows was booted, but suddenly the laptop powered off. Since than I cant power it on. I made a video of its behaviour:
http://www.youtube.com/watch?v=3iZykN4Dtz0&feature=youtu.be
If I plug in the AC power, it is blinking like this and when I try to power on, it cant start.
Can you help me? What is the problem with it?
Solved!
Go to Solution.

However, you should still removethe keyboard and clean up all the juice residue. Acidity and sugars can cause problems down the road and none of that is covered by warranty if there is any indication of liquid damage.
Unplug everything, remove the battery and keyboard and cleaneverything with a cotton swab moistened with isopropyl alcohol. Let dry and reassemble.
For water damage, remove the battery and keyboard and place the affected item (cell phone, computer etc) in a classic bag with desiccant. Rice works in a pinch but not as well. Leave itthere for two or three days.
DO NOT TRY TO START THE DEVICE ONCE IT HAS GOTTEN WET UNTIL YOU HAVE DRIED IT OUT USING ONE OF THE METHODS ABOVE.
I know it is hard not to try to restart it right after it has gotten wet but that may cause additional damage.
Lesson learned - don't eat or drink by your computer..

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Keyboard dead after some water

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That would be the best thing to do unless the part number has been superceded with another in the maintenence & Service guide for your notebook series. Check in the addendum in the end of the first section of the guide.
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Thinkpad T420 with Optimus: Card is turning on at random

Hey yall,
I'm using bumblebeed on my Thinkpad T420 and upgraded to bbswitch for power management. The discrete card still shows up in lspci when it's 'turned off" but power consumption goes down and bumblebee says its off, so I figure that's the best I'm gonna get.
Weird thing is, it keeps turning itself on for no good reason. I manually switch the daemon on and off, which I thought was completely controlling all software interface with the card. Apparently ACPI is turning the card on for some reason, and I don't want it to. The only reason I noticed is because I was watching the logs to figure out unrelated ACPI behavior. Pasted below is when I unplugged the laptop and plugged it back in a couple times to see what happened. About a minute later, ACPI wakes up the card. The stuff after that is me running a script that cycles the daemon, which is the most consistent way I have to disable the card manually. I think I pressed a laptop button in there somewhere too.
Does anyone know why ACPI might be waking up the card at random, and how to get it to stop? I have a feeling it's eating away at my battery without my knowledge by turning itself on when I'm on the road.
Apr 1 03:54:11 localhost josh: ACPI action undefined: PNP0C0A:00
Apr 1 03:54:11 localhost laptop-mode: Laptop mode
Apr 1 03:54:11 localhost laptop-mode: enabled,
Apr 1 03:54:11 localhost laptop-mode: not active [unchanged]
Apr 1 03:54:11 localhost josh: ACPI action undefined: PNP0C0A:00
Apr 1 03:54:11 localhost laptop-mode: Laptop mode
Apr 1 03:54:11 localhost laptop-mode: enabled,
Apr 1 03:54:11 localhost laptop-mode: not active [unchanged]
Apr 1 03:55:01 localhost kernel: [43515.975286] nvidia 0000:01:00.0: power state changed by ACPI to D0
Apr 1 03:55:01 localhost kernel: [43515.975304] nvidia 0000:01:00.0: power state changed by ACPI to D0
Apr 1 03:55:01 localhost kernel: [43515.975308] nvidia 0000:01:00.0: enabling device (0000 -> 0003)
Apr 1 03:55:01 localhost kernel: [43515.975313] thinkpad_acpi: EC reports that Thermal Table has changed
Apr 1 03:55:01 localhost kernel: [43515.975316] nvidia 0000:01:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
Apr 1 03:55:01 localhost kernel: [43515.975329] vgaarb: device changed decodes: PCI:0000:01:00.0,olddecodes=none,decodes=none:owns=none
Apr 1 03:55:01 localhost kernel: [43515.975477] NVRM: loading NVIDIA UNIX x86_64 Kernel Module 295.33 Sat Mar 17 14:55:45 PDT 2012
Apr 1 03:55:01 localhost josh: ACPI group/action undefined: ibm/hotkey / LEN0068:00
Apr 1 03:55:38 localhost bumblebeed[13836]: /usr/sbin/bumblebeed 3.0 started
Apr 1 03:55:38 localhost kernel: [43553.070886] bbswitch: disabling discrete graphics
Apr 1 03:55:38 localhost kernel: [43553.083249] pci 0000:01:00.0: Refused to change power state, currently in D0
Apr 1 03:55:38 localhost kernel: [43553.083871] thinkpad_acpi: EC reports that Thermal Table has changed
Apr 1 03:55:38 localhost josh: ACPI group/action undefined: ibm/hotkey / LEN0068:00
Apr 1 03:55:38 localhost bumblebeed[13839]: Received Terminated signal.
Apr 1 03:55:38 localhost kernel: [43553.091937] pci 0000:01:00.0: power state changed by ACPI to D3

Ok, so, apparently it is turning itself on when I'm using Flash. I am scratching my head. My browser should have no idea that card exists, because I use optirun to select things to run in that layer. And the bumblebee daemon is off. This seems like a security issue! I'm only able to control the card with root privileges; how on earth is Flash getting around that?
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My thinkpad t420s doesn't last 2 hours

hardware and software:
* thinkpad t420s, brand new with standard battery
* CPU: i7-2640M CPU @ 2.80GHz, 4 cores. frequency scaling is enabled, they all usually run at 800MHz (ondemand governor)
* intel SSD, no HDD
* wifi: iwlwifi: Intel(R) Centrino(R) Advanced-N 6205 AGN, REV=0xB0
* thinkfan is installed, but couldn't get it configured properly. TODO
* kernel args
[dieter@dieter-t420s ~]$ cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-linux root=/dev/mapper/cryptpool-root ro root=/dev/mapper/cryptpool-root cryptdevice=/dev/sda3:sda3crypt:allow-discards ro add_efi_memmap i915.modeset=1 i915.i915_enable_rc6=1 i915.i915_enable_fbc=1 i915.lvds_downclock=1 pcie_aspm=force quiet quiet add_efi_memmap
bios options:
* graphics is set to optimus (though i don't have bumblebee/optimus enabled right now, I haven't needed to attach an external display). TODO force "built-in GPU" in bios, maybe that helps.
* intel speedstep set to optimal battery usage when not on AC
* adaptive thermal management set to "balanced" (it's that or performance)
* cpu power management enabled
* pci-e power management enabled
test:with some basic usage (say 40 min of browsing over wifi and watching some vids, and the rest idle) it doesn't last 2 hours. (about 1h50min)
although I think I have all the most important things taken care of, I'll also have a look at https://bbs.archlinux.org/viewtopic.php?id=134109 and maybe laptop mode tools (I did look at it, but as i don't have a HDD and i have frequency scaling already enabled...)
I'll also need to try some power diagnostic tools like powertop or whatever it was.
any more tips? this is kindof disappointing, I was expecting 4-5-6 hours.. thanks!
Last edited by Dieter@be (2012-05-22 08:54:48)

Dieter@be wrote:
jdahm wrote:
I have a T420 (didn't want to bother with the dedicated GPU) and get 6+ hours. I followed the steps on 'Laptop' on the wiki, installed tp_smapi, thinkfan, granola, etc.
i also had trouble getting thinkfan to work. The trick I found with it is to stop the daemon and launch it manually (with the -n flag, as shown in the rc.d daemon script) to see what it complains about. After a few iterations to thinkfan.conf the daemon seemed to start without problem. This thread (found on the thinkwiki AUR page) helped me the most: http://ubuntuforums.org/showthread.php?t=1749186&page=1.
thanks, so what's your thinkfan config?
Here it is. Hope this is helpful. You'll probably need to run that find command and replace the four lines which start with "sensor".
## Notes:
# sources:
# + [url]http://ubuntuforums.org/showthread.php?t=1749186&page=1[/url]
# Use this command to find devices:
# find /sys/devices -type f -name "temp*_input"
# Specify the fan to use
fan /proc/acpi/ibm/fan
# Sensors
sensor /sys/devices/platform/coretemp.0/temp1_input
sensor /sys/devices/platform/coretemp.0/temp2_input
sensor /sys/devices/platform/coretemp.0/temp3_input
sensor /sys/devices/virtual/hwmon/hwmon2/temp1_input
#(0, 0, 55)
#(1, 48, 60)
#(2, 50, 61)
#(3, 52, 63)
#(4, 56, 65)
#(5, 59, 66)
#(7, 63, 32767)
# More conservative settings
(0, 0, 35)
(1, 33, 38)
(2, 36, 45)
(3, 39, 49)
(4, 46, 58)
(5, 50, 62)
(7, 56, 32767)
Last edited by jdahm (2012-05-24 01:29:35)

Coffee spilled underneath ThinkPad T420

Today I managed to tip over a cup of (lightly sugared) coffee on the table where my ThinkPad T420 was running. Fortunately it was at sufficient distance that it didn't tip into the laptop, but the liquid spill went underneath.
I quickly removed it from the spill, disconnected power and turned off, and attempted to clean up what I could. Unfortunately in handling the laptop I didn't keep it upright the whole time, so there was some spread of liquid across the bottom of the machine, albeit not a large amount.
So far as I can see, the major risks to the machine have been that:
Liquid may have leaked into the fan vents on the bottom of the machine;
There seems to have been some leakage into the cracks around the battery; although I removed the battery and cleaned up what I could, I imagine there may still be residue in various crevices
There may have been some leakage into things on the side of the machine, such as the SD card reader
Having left it standing for some time (correct way up so liquid would not propagate further into the system), with the battery removed, I decided to risk turning it back on with battery only just to make a backup of files and type this message. There's no obvious problem, but I'm going to turn the system back off again immediately after finishing typing. ;-)
I'd appreciate advice on the general risk to the machine here and how I should proceed with getting it cleaned up beyond what I've already done. I imagine the interior is fairly well guarded against liquid entering whether from top or bottom, but I can imagine there might be some corrosion risk from coffee/sugar getting into the ventilation system.
Thanks in advance for any advice!
Solved!
Go to Solution.

if you are worried about spillage and seepage into the laptop, then i would recommend you dismantle the laptop, and give everything a good clean to make sure no stray liquid got onto the laptop. This will prevent future headaches (if you intend to keep the machine for a while).
Once you have the motherboard by itself, you can see whether any traces of your coffee got onto the laptop and see whether the laptop casing has traces. You can clean the liquid residues off using all good PCB board cleaning fluids.
http://support.lenovo.com/en_AU/guides-and-manuals/detail.page?LegacyDocID=MIGR-76853
Regards,
Jin Li
May this year, be the year of 'DO'!
I am a volunteer, and not a paid staff of Lenovo or Microsoft

Thinkpad T420 Intermittent Freezing / Lockup

Thinkpad T420 Intermittent Freezing / Lockup
My Thinkpad T420 keeps intermittently permanently freezing / locking up. However it seems that anything that uses hardware acceleration makes the system suddenly lockup. For instance, boot into Windows 7 and open Chrome Browser play a YouTube Video and it will lock up or enable the Windows Areo Theme and try looking at the event manager will also make the system permanently lock-up.
Here is the troubleshooting that I have tried so far:
Fresh OS installation from the recovery partition and update using Lenovo System Recovery but problem still persists. ( includes updated BIOS )
Run Lenovo Diagnostics ( 20 times pass over ) and no fault reported. ( no test in Diagnostics for CPU Graphics )
Tried a known good harddrive and loaded Windows 7 and applied Lenovo System update and problem still persists.
Tried using a known good memory module ( Lenovo T420 memory module ) tested separately in each memory bank, the problem still persists.
Used the machine with out the Battery, using just power cord and problem persisted.
Used the machine with just the battery and the problem still persisted.
Using the machine with Battery connected plus power adapter and problem persists.
Removed the DVD drive and the problem persisted.
Removed the Wifi Card and the problem still persisted.
Removed the 3GS card and problem still persisted.
Swapped over another keyboard from another Thinkpad T420 and problem still persists.
Disabled Fingerprint reader in BIOS and problem still persists.
Confirmed no freezes if Thinkpad is booted into the BIOS and left for some hours.
Booted machine with a live Linux Mint 16 DVD and problem still persists ( Freezes straight away )
No freezing when the laptop is used in Windows 7safemode.
No freezing when the laptop is used with Linux Mint in safe mode though Mint does confirm that hardware acceleration has been disabled.
CPU tempertures are within the normal range.
The troubleshooting confirms that the problem is a hardware fault. So I logged a warranty call and explained that it was likely a fault with the System Board or the CPU. The engineer replaced the system board and the problem still remained.
So it look most likely that the integrated graphics seem to be causing the problem, especially when the system freezes when hardware acceleration is used. Has anyone else had a similar problem. I'm now waiting for the next plan of action form Lenovo. I did confirm the system freezing problem with Windows 7 and Mint 16 after the engineer replaced the system board and before he left. I'm still waiting on Lenovo getting back.

I done extensive testing, it was not the hard drive. It turned out that the integrated graphics on the cpu were faulty. The CPU has since been replaced and the problem solved. As per my first post, anything that used hardware acceleration would cause the freeze hence my suspicion about it being the cpu or planer board. It would freeze in windows and when using a live mint Linux cd, so the mint live cd ruled out the hard drive and preloaded software on it.
Thanks,

[SOLVED] Huge power consumption after kernel upgrade.

Dear All,
I have recently bought the new lenovo thinkpad X1 equipped with a Core I5 processors and 4GB of RAM.
I am quite satisfied with this machine except for the fact that the fan is extremely loud (but perhaps a bios upgrade will fix problem).
Now my problem:
When I first installed Arch (first days of August) I ran powertop and the power consumption was around 10 Watts when idle with wifi card turned off.
Now, after some upgrades, the power consumption raises to 18W in idle and consequently the battery lasts less than 2h.
Here my current configuration:
Linux think-x1 3.0-ARCH #1 SMP PREEMPT Tue Aug 30 08:53:25 CEST 2011 x86_64 Intel(R) Core(TM) i5-2520M CPU @ 2.50GHz GenuineIntel GNU/Linux
and here the powertop output obtained with the cpu frequency governor set to "On demand":
Cn Avg residency P-states (frequencies)
C0 (cpu running) ( 5.3%) Turbo Mode 0.1%
polling 0.0ms ( 0.0%) 2.50 Ghz 0.0%
C1 mwait 0.2ms ( 0.1%) 2.21 Ghz 0.0%
C2 mwait 0.3ms ( 0.0%) 1200 Mhz 0.1%
C3 mwait 2.4ms ( 0.0%) 800 Mhz 99.8%
C4 mwait 13.1ms (94.6%)
Wakeups-from-idle per second : 76.1 interval: 3.0s
Power usage (ACPI estimate): 15.7W (2.8 hours)
Top causes for wakeups:
46.5% (135.7) kworker/0:0
17.7% ( 51.7) PS/2 keyboard/mouse/touchpad interrupt
11.9% ( 34.7) [kernel scheduler] Load balancing tick
8.6% ( 25.0) [iwlagn] <interrupt>
2.9% ( 8.3) [i915] <interrupt>
2.6% ( 7.7) [acpi] <interrupt>
1.8% ( 5.3) chromium
1.6% ( 4.7) [kernel core] hrtimer_start (tick_sched_timer)
1.5% ( 4.3) kworker/0:1
0.7% ( 2.0) minilogd
0.7% ( 2.0) [kernel core] iwl_bg_watchdog (iwl_bg_watchdog)
0.6% ( 1.7) X
0.6% ( 1.7) [kernel core] intel_gpu_idle_timer (intel_gpu_idle_timer)
0.3% ( 1.0) Terminal
0.3% ( 1.0) [kernel core] tpt_trig_timer (tpt_trig_timer)
0.2% ( 0.7) [mmc0, mei, ehci_hcd:usb3] <interrupt>
0.2% ( 0.7) upowerd
0.1% ( 0.3) init
0.1% ( 0.3) gpg-agent
0.1% ( 0.3) [kernel core] ieee80211_sta_reset_conn_monitor (ieee80211_sta_conn_mon_timer)
0.1% ( 0.3) wicd-client
0.1% ( 0.3) kworker/u:3
0.1% ( 0.3) watchdog/0
I have also tried to disable most of the running daemons and unload some modules, but I have never got less than 14/15W when idle, which in my opinion is definitely too much!
As far as I'm concerned, the kworker process is responsible most of the wakeups.
Any ideas?
Last edited by jacopo_c (2011-09-05 13:12:16)

pogeymanz wrote:I read somewhere that the kernel devs really don't see this as an issue. They just expect that laptop owners should know to try these boot parameters. So, definitely not by 3.1.
from https://bugzilla.redhat.com/show_bug.cgi?id=727579:
Dave Jones 2011-08-03 15:32:21 EDT
enabling it by default in 3.0 caused regressions for some people, so it was
disabled. Hopefully Intel figures it out, and we can switch it back on by
default in 3.1 / 2.6.41 (until then, you'll have to set it by hand).
Interesting stuff, also recommend this thread on phoronix:
http://phoronix.com/forums/showthread.p … Regression
Last edited by masteryod (2011-09-12 00:30:00)

Thinkpad T420s - is it safe to run the CPU on PM 'Maximum Turbo' mode 24/7?

Hi guys,
I have been playing around with Power manager system settings and observed following core frequency behaviour:
Maximum Turbo - clocks all cores close to their Turbo Frequency (3.2GHz on mine) and they stay there, regardless if
                             under load or not
Turbo - frequency jumps between 2.4GHz and 3.2GHz
           - under load jumps to 3.2GHz and stays there (while under load)
Balanced - frequency jumps between 2.2GHz and 2.7Ghz
                 - under load jumps to 2.7GHz and stays there (while under load)
Low - frequency locked to 800Mhz, regardless if under load or not
First, I would like to ask for confirmation if this is really how it should work, and/or if someone is able to observe different behaviour.
Secondly, there is virtually NOTHING in the PM documentation that describes these parameters and what they do!
My main question: How safe is it to use the Maximum Turbo mode 24/7?
I can imagine that this CPU was not designed to run on 3.2GHz 24/7 and that the Turbo Boost is expected to occur only ocassionally.
Even if I choose to ignore the heat factor, would this mean increased wear on CPU?
Could the 'Turbo' mode be regarded as safe?
After some extensive testing, I can really see performance boost between 'Balanced' (which doesn't use Turbo) and 'Turbo'.
What I don't understand is why 'Turbo' seems to be jumping to Turbo Frequency, when the CPU is idle.
I would appreciate any comments and observations.
many thanks
//Matt
I used HWInfo64 to observe the CPU frequency and Prime95 to generate the load
CPU: Intel Core i7-2620M
Solved!
Go to Solution.

I have the T420s with the Core i5 processor. My observations are similar to yours, except when I'm on the Balanced and Turbo settings, the frequency drops to 800mhz when the CPU is not under load.
There is one option you forgot to describe: the "Lenovo Turbo Boost+" option in the power manager. This option appears to lock the fan at a high RPM to cool the CPU more quickly. This would reduce any thermal throttling when running at high clock speeds for a long period of time.
Regarding why "Turbo seems to be jumping to Turbo Frequency when the CPU is idle", please note that your CPU is never completely idle. WIndows and its applications run many processes and tasks in the background, and it is normal to see a burst of CPU activity every couple of seconds. To observe this, download the "Sysinternals process monitor" utility and watch all of the background activity that occurs.
Regarding the increased wear on CPU, running at high temperatures reduces the lifetime of electronic components. There are no problems other than the "heat factor", but excessive heat can be a significant problem.

Thinkpad Yoga, not waking up after sleep

I have an issue with my Thinkpad Yoga (20CD).
Sometimes after I have left my Yoga unattended. I come back and find that it's on (red light on) but screen is black, but nothing happends when moving mouse or pressing keys.
I believe this is happens with regards to sleep mode.
I still have some analysis to do wether it happens when power is connected or not, external monitor is connected or not.
I have installed all the latest drivers from lenovos website.

Hi Henrikh,
Welcome to Lenovo Community Forums!
I’m sorry to hear that your ThinkPad Yoga goes to sleep and doesn’t resume normally.
To disable the system from going automatically to sleep mode, go to control panel -> Power options -> on the left hand side, Change when the computer sleeps -> Change “Put the computer to sleep” to never.
To enable a device to wake up the system from sleep, Go to control panel -> Device manager -> Go to "Mice and other pointing devices" and double click on the mouse which you are using and check "Allow this device to wake the computer". Press OK.
Do the same for keyboard as well.
Do let me know if it helped!
Best regards,
Mithun.
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ThinkPad t420 cant power on after some water...

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