RF transmission power control

Hi,
One of our customer is using two 7920 phones through two AP1200 access points with IOS 12.3(2)JA, in a room.
The customer experienced reset of 7920 frequently from the beginning.
However, after we changed RF transmission power settings for AP1200, the resetting problem was decreased very much.
We added the following configuration into the AP.
interface dot11radio0
power local 20
power client 20
Could anyone advise me about the reason why decreasing the TX power is effective for the problem?
Are you supposed to control the TX RF power generally for wireless LAN system or wireless VoIP system?
Best regards,
Kawakami

So with 1.08 firmware or higher the 7920 can adjust it's transmit power dynamically via the "power client X" command. For transmit power settings, this all depends on the site survey for that environment which is required to deploy the 7920 successfully. Need to ensure the noise is kept ot a minimal and that SNR of 25db is met in all areas. Refer to http://www.cisco.com/en/US/products/hw/phones/ps379/products_implementation_design_guide_book09186a00802a029a.html for more info.
Also we don't recommend 12.3(2)JA as there is a bug related to QBSS, where the CU is falsely advertised. Use 12.3(2)JA2 or higher. For 7920, 1.09 was just released and can download from http://www.cisco.com/cgi-bin/tablebuild.pl/ip-7900ser-crypto.

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Transmission power output settings

Dear all,
Does anyone know if there is a way to control wi-fi output transmission power on MacBook Pro? Some sort of direct driver control/sysctl/anything else?
Thanks!

Please look at the Tech Specs posted on Apple's website, if the information you are asking about isn't posted then Apple does not publish it to the general public.

HP AC POWER CONTROLL don't work with F 35 A BIOS

The HP AC POWER CONTROL IN VERSION 1.00 DOES NOT WORK PROPERLY B AFTER UPDATE BIOS F.35 A REVISION TO THE Notebook-in HP Pavilion 17-e135sw SERIAL NUMBER PRODUCT [edited Serial by moderator]# AKD.
Despite reinstalling the HP AC POWER CONTROL and set the interval again, the battery is not charging when the time interval has elapsed. There is a minimum charge level maintained at 15%, the computer shows the power is not charging the battery status.
The suggestion to donate 1
Please improve application performance
The suggestion to pass 2
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Example Tayfa G12w distributor tauron:
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@Marcin_Pudełko
‎Thank you for using HP Support Forum. I have brought your issue to the appropriate team within HP. They will likely request information from you in order to look up your case details or product serial number. Please look for a private message from an identified HP contact. Additionally, keep in mind not to publicly post ( serial numbers and case details).
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I Work for HP

[solved] systemd power control doesn't work

Since there is no way of getting systemctl power control work without sudo, I tried modifying sudoers to allow my user to operate them without password.
However, it still won't work.
I tried that
cross ALL = NOPASSWD: /usr/sbin/hibernate,/usr/bin/systemctl suspend,/usr/bin/systemctl reboot,/usr/bin/systemctl suspend,/usr/bin/systemctl hibernate
and I tried that
cross ALL = NOPASSWD: /usr/bin/systemctl
The result was the same:
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Failed to issue method call: Access denied
Failed to issue method call: Access denied
Last edited by impact (2012-11-09 11:28:17)

impact wrote:
Since there is no way of getting systemctl power control work without sudo, I tried modifying sudoers to allow my user to operate them without password.
However, it still won't work.
I tried that
cross ALL = NOPASSWD: /usr/sbin/hibernate,/usr/bin/systemctl suspend,/usr/bin/systemctl reboot,/usr/bin/systemctl suspend,/usr/bin/systemctl hibernate
and I tried that
cross ALL = NOPASSWD: /usr/bin/systemctl
The result was the same:
$ systemctl suspend
Failed to issue method call: Access denied
Failed to issue method call: Access denied
you have to use "sudo systemctl suspend" still, sudoers is only affecting sudo behavior as it was mentioned...
nahuy_systemd wrote:systemd very bad system. I solved this. I moved to CRUX.
...and you registered to the forum just to tell us that? well, if I were you, i would either change the doctor or make him prescribe me another pills

K430/K450: here`s the SOLUTION to Lenovo Power control switch not working anymore.

If your power control switch isn`t working anymore BUT you didn`t unistall it or erase some of his files, chances are that over time some software/update took control of some setting used by the Lenovo switch.
If this is the case, before reinstalling the software, try the following:
1 - Check your power plan option, if is on something else than Lenovo change your power plan option (scheme) to Lenovo Power Scheme.
2 - Access your pc advanced startup setting (win+x) check for the services LitModeCtrl and LenovoComService and set the two services to automatically start when the computer startsup. If it`s not working 99% is because some software (the most common is Samsung SSD Magician) has set the two to "Manual". Change to "Auto".
3 - Reboot and the Power control switch software will be working again.
I wonder why no one from Lenovo advice this, but i`ve had to find a solution myself after countless hit & miss attempts.

hi FlashOfLight,
Welcome to the Forums.
Have you tried performing a system restore to undo the changes? (by default, this feature is set to enabled)
regards,
neokenchi
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RE: Ideacentre K430 Power Control Switch (need the original cpu meter)

Dear Lenovo,
I buyed this desktop, and it worked well...BUT!... ->
I reinstalled (full HDD format) the Windows 7, and deleted my backup (recovery?) partition. When i finished the installing of Windows 7, the power control switch doesn't work anymore and the CPU meter has gone. Installed all drivers, downloaded from lenovo.com but there is no software for Power Control Switch and Cpu meter.
Here is the manual, - i need this funktion. <<<<< LINK
You should upload (or make) a software for power control switch with the original CPU meter.
You should support the users!
Thanks...

Do you have W7 64 bit OS. If so, I can help.

K450 doesn't have Power control switch?

Hi,
I recently bought a Lenovo Ideacentre K450 (refurbished) from lenovo outlet. When I received it I was a bit surprised that it doesn't have the power control switch, and there's no LED lighting as well. It looks more like a low-end K410. I suppose all K450 would have the power control switch, or am I actually wrong? The model # of my machine is 57314032, with i7-4770, 16GB DDR3 and 2TB hard drive.
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Solved!
Go to Solution.

hi adcmaker,
Thanks for Posting!
I suggest you contact Lenovo Post sales.
The Power Control Switch is a solid feature and not part of the optional ones.
It would be best if you would hear it from them since the unit is refurbished Im not sure if this is really how the system is.
Regards
Solid Cruver
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If you find a post helpful and it answers your question, please mark it as an "Accepted Solution"! This will help the rest of the Community with similar issues identify the verified solution and benefit from it.
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K430 Power Control Switch software

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thanks

I was puzzled by this too. You can pull up the switch by clicking on its icon down in the tray by your taskbar, which just makes a speedometer-thingy appear on your desktop. Tis completely useless as far as I can tell, aside from changing colors as I manually flip the switch atop the computer. Am I missing something?
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Lenovo Power Control Switch

When trying to install a program, I accidentally uninstalled the Power Control Switch. I can not find a download for it.
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hi FlashOfLight,
Welcome to the Forums.
Have you tried performing a system restore to undo the changes? (by default, this feature is set to enabled)
regards,
neokenchi
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If you find a post helpful and it answers your question, please mark it as an "Accepted Solution"! This will help the rest of the Community with similar issues identify the verified solution and benefit from it.
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I have an IdeaCentre K430 on which I would like to do a clean Win 8.1 installation. I have the Win 8.1 installation DVD from Microsoft. If I do this clean installation of Win 8.1, is there any way for me to then install the Lenovo Power Control Switch software on my K430? I ask this because I can't find this software available for download anywhere on the Lenovo site. Thanks for your help.

hi sermak,
Thanks you for using Lenovo Community Forums!
I'm afraid that you cannot install the software back, Since it is one of the Proprietary software that came preload on your machine a download link for this is not available online.
I have encountered thread here with similar concern.
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Regards
Solid Cruver
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If you find a post helpful and it answers your question, please mark it as an "Accepted Solution"! This will help the rest of the Community with similar issues identify the verified solution and benefit from it.
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Lenovo Power Control Switch or Power Dial software

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hi FlashOfLight,
Welcome to the Forums.
Have you tried performing a system restore to undo the changes? (by default, this feature is set to enabled)
regards,
neokenchi
Did someone help you today? Press the star on the left to thank them with a Kudo!
If you find a post helpful and it answers your question, please mark it as an "Accepted Solution"! This will help the rest of the Community with similar issues identify the verified solution and benefit from it.
Follow @LenovoForums on Twitter!

Klaptop - power control

hi..
i want configure klaptop but when u go to power control and button action i can't because i have to enbale acpi suspend/resume options in acpi panel..... where i can enable this options?

If it can be of any help to troubleshoot the issue, here`s the log of the MS file inside the power control switch directory:
ModeSwitch 2014- 3-26 18:23: 0:969 : Create Log File: C:\Program Files\Lenovo\Power Control Switch\MS.log
ModeSwitch 2014- 3-26 18:23: 0:969 : Device Path: \\?\scsi#cdrom&ven_pioneer&prod_bd-rw___bdr-208d#4&47a8656&0&030000#{53f56308-b6bf-11d0-94f2-00a0c91efb8b}
ModeSwitch 2014- 3-26 18:23: 0:969 : Create Device Path: \\?\scsi#cdrom&ven_pioneer&prod_bd-rw___bdr-208d#4&47a8656&0&030000#{53f56308-b6bf-11d0-94f2-00a0c91efb8b}
ModeSwitch 2014- 3-26 18:23: 0:969 : Device Path: \\?\scsi#cdrom&ven_dvdfab&prod_virtual_drive&rev_1.1#1&1843ccbc&0&000000#{53f56308-b6bf-11d0-94f2-00a0c91efb8b}
ModeSwitch 2014- 3-26 18:23: 0:969 : Create Device Path: \\?\scsi#cdrom&ven_dvdfab&prod_virtual_drive&rev_1.1#1&1843ccbc&0&000000#{53f56308-b6bf-11d0-94f2-00a0c91efb8b}
ModeSwitch 2014- 3-26 18:23: 0:969 : ODD Handel:      2a4
ModeSwitch 2014- 3-26 18:23: 0:969 : ODD Target ID:    0
ModeSwitch 2014- 3-26 18:23: 0:969 : ODD Handel Found:      2a4
ModeSwitch 2014- 3-26 18:23: 0:969 : ODD Mode: NORMAL
ModeSwitch 2014- 3-26 18:23: 0:985 : Buffer Data 56 90
ModeSwitch 2014- 3-26 18:23: 0:985 : ODD Max Speed: 22160
ModeSwitch 2014- 3-26 18:23: 0:985 : CPU Freq: 3401
ModeSwitch 2014- 3-26 18:23: 0:985 : ODD Mode: NORMAL
ModeSwitch 2014- 3-26 18:23: 1:469 : CPU Freq: 3401
ModeSwitch 2014- 3-26 18:23: 1:469 : ODD Mode: NORMAL

Power control unit interface problem

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I apologize, I didn't realize how vague I was being. I am trying to make it so that the front panel will basically mimic the instrument itself. I am not able, however, to do so because when I write the code with a while loop I use 'ok buttons' and 'power lights' and place them on the inside of the while loop. I will turn on the power to a switch and when the loop goes through the first iteration the power light and button will reset itself to the default position (light off and button labeled off) I have attatched the very basics of what i am having troubles with (both front panel and block diagram). Thanks.
Attachments:
screen_shot_ipc1.bmp ‏1826 KB
screen_shot_ipc2.bmp ‏2808 KB

RF transmission power control

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