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78 Posts

05-15-2011

USA

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  • Message 21 of 55

Re: X220 uncontrollably switches to 50Hz refresh rate upon unplug from power source

2011-07-04, 0:31 AM

All,

 

Hate to revive this, but as far as I can tell, the issue only exists on Lenovo laptops, in spite of Intel's software having something to do with it.  Doesn't that mean there has to be some sort of cause stemming from the laptop telling the Intel software to switch the refresh rate?

 

Thanks as always for any insight, as this is driving me nuts, crashing my games, and all sort of other unexpected stuff...

Owner/Technology Specialist
Triple-S Computers - http://www.TripleSComputers.com
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78 Posts

05-15-2011

USA

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  • Message 22 of 55

Re: X220 uncontrollably switches to 50Hz refresh rate upon unplug from power source

2011-07-04, 0:42 AM

Nevermind -- Just solved the problem with the help of another post by JameZ on another Lenovo forum (regarding the same problem with another Lenovo laptop).  Here's the deal:

 

http://forum.lenovo.com/t5/T400-T500-and-newer-T-series/T420s-Screen-refresh-rate-drop-to-50Hz-when-on-Battery/ta-p/461845

 

Follow these instructions using the Intel driver of your choice, with one difference:

 

Search for 0xF800 instead and replace it with 0xF840.  There are two matches for this which require replacement in the driver inf file.

 

I used the newest Intel drivers instead of Lenovo's drivers from the support site, but you may use either.  If you choose to go the Intel driver route, you will need to force installation via Have Disk... from the Device Manager interface.

 

My problem is no solved, and I am much happier. Hope this helps someone else.  :-)

 

Moderator edit five weeks later: This is fixed by Lenovo and Intel in the latest graphics driver:

 

64 bit:

http://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles/83d631ww.txt

http://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles/83d631ww.exe

 

32 bit:

http://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles/83d531ww.txt

http://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles/83d531ww.exe

Owner/Technology Specialist
Triple-S Computers - http://www.TripleSComputers.com

0 person found this solution to be helpful.

This helped me too

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23 Posts

05-21-2011

Germany

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  • Message 23 of 55

Re: X220 uncontrollably switches to 50Hz refresh rate upon unplug from power source

2011-07-04, 7:27 AM
0xF900, not 0xF800.
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78 Posts

05-15-2011

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  • Message 24 of 55

Re: X220 uncontrollably switches to 50Hz refresh rate upon unplug from power source

2011-07-04, 16:26 PM

In my inf file it was 0xF800... so perhaps each version is different (Lenovo vs. Intel provided?). 

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Triple-S Computers - http://www.TripleSComputers.com
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84 Posts

04-12-2011

United Arab Emirates

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  • Message 25 of 55

Re: X220 uncontrollably switches to 50Hz refresh rate upon unplug from power source

2011-07-06, 10:24 AM

I hate to to make changes myself (not a professional) so wonder if Lenovo technical team will soon issue some sort of patch or update to resolve this issue ??:smileysad:

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55 Posts

05-24-2011

New York City

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  • Message 26 of 55

Re: X220 uncontrollably switches to 50Hz refresh rate upon unplug from power source

2011-07-17, 19:55 PM

wrote:

Nevermind -- Just solved the problem with the help of another post by JameZ on another Lenovo forum (regarding the same problem with another Lenovo laptop).  Here's the deal:

 

http://forum.lenovo.com/t5/T400-T500-and-newer-T-series/T420s-Screen-refresh-rate-drop-to-50Hz-when-on-Battery/ta-p/461845

 

Follow these instructions using the Intel driver of your choice, with one difference:

 

Search for 0xF800 instead and replace it with 0xF840.  There are two matches for this which require replacement in the driver inf file.

 

I used the newest Intel drivers instead of Lenovo's drivers from the support site, but you may use either.  If you choose to go the Intel driver route, you will need to force installation via Have Disk... from the Device Manager interface.

 

My problem is no solved, and I am much happier. Hope this helps someone else.  :-)

 


Thanks for posting this, it fixed the issue for me. I got 0xF900 also, and not the 0xF800. Don't know what the difference is, but my drivers are directly from Lenovo X220 drivers download. Thanks a lot.

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32 Posts

06-03-2011

UK

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  • Message 27 of 55

Re: X220 uncontrollably switches to 50Hz refresh rate upon unplug from power source

2011-07-18, 12:31 PM

Thanks OtherSteve!

 

Went for the original Intel drivers this time around and it worked perfectly with 0xF840 like you suggested. 

 

Gundy 

X220 4286 CTO, i7-2620M, 8GB RAM (2x4), 320GB HDD+Intel mSATA 80 GB, IPS display, BT 3.0, Intel 6205 WiFi, Finger Print Reader, Win7 Pro 64
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271 Posts

05-31-2011

San Francisco

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  • Message 28 of 55

Re: X220 uncontrollably switches to 50Hz refresh rate upon unplug from power source

2011-07-18, 16:11 PM

Are there any drawbacks to keeping the refresh at 60Hz? Perhaps power consumption? How much of a difference does it make?

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1 Posts

07-19-2011

Israel

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  • Message 29 of 55

blank screen for a second while connecting / disconnecting power supply thinkpad t510

2011-07-19, 18:36 PM

i had the same symptoms on my thinkpad t510 win7.

 

i solved the problem by switching the display refresh rate from 60 to 50 Hz while AC connected.

 

the machine can't switch from 50 to 50 Hz - so the display stays on - permanently 50 Hz.

 

i figured my eyes don't do 60 Hz anyway, and my brains max. 20 Hz - so 50 Hz is more than enough for me :smileywink:

 

Btw. - i don't have patience to go deeper into that -  but there is a option in the lenovo power manager / idle timers / lower display refresh rate to 50, you can choose there "never" or change to lower to "60" - this has no effect at all.

 

There seems to be an over ruling by windows control panel power options. i didn't find there a possibility to influence on screen resolution.

 

But if the windows power options is the boss anyway - what do i need the lenovo power manager for?

Or is there a way to disable the windows build in power options?

 

greetings, HaZZ 

 

 

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5526 Posts

04-25-2008

United States of America

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  • Message 30 of 55

Re: X220 uncontrollably switches to 50Hz refresh rate upon unplug from power source

2011-08-11, 8:52 AM

This is fixed by Lenovo and Intel in the latest graphics driver. I added the links to the previous solution:

 

http://forums.lenovo.com/t5/X-Series-ThinkPad-Laptops/X220-uncontrollably-switches-to-50Hz-refresh-rate-upon-unplug/m-p/472155#M26660

USB-C: Just cos it fits don't mean it works.
I don't work for Lenovo. I'm a crazy volunteer!
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