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3 Posts

06-10-2012

Edinburgh, UK

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t420s discrete graphics issue

2013-12-21, 6:13 AM

Hello guys,

 

My Thinkpad T420S (4171CTO) is freezing when I set BIOS to use only discrete graphics with OPTIMUS detection off.

 

Windows 8.1 Pro is booting up fine, but maybe within 20s after booting up the laptop freezes. Even if I will not log in and leave the system running for 20-30s it freezes as well. There is no BSOD, it's simply mouse and keyboard not responding and I have to hold the power button to shut down. 

 

I've installed Debian Wheezey 7.3 and it freezes as well.

 

When I set BIOS to use OPTIMUS, then Windows 8.1 Pro works fine and Debian Wheezy wors great as well, but it's only limited to Intel HD3000 integrated card. 

 

How can I diagnose my discrete graphics? 

 

Thank you

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10 Posts

01-21-2014

toronto

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Re: t420s discrete graphics issue

2014-01-27, 23:21 PM

I have this exact issue. I found a partial fix. You need to uninstall the lenovo monitor driver from device manager, but then you lose brightness control, so it's a driver issue on Lenovo's end.

 

Have you found a solution?

 

http://forums.lenovo.com/t5/T400-T500-and-newer-T-series/Windows-8-1-freezes-while-booting-up-with-discrete-graphic-card/td-p/1405507

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6 Posts

05-23-2016

United States of America

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Re: t420s discrete graphics issue

2016-05-26, 5:58 AM

You need to download Lenovo Thinpad LCD INF file in support.lenovo.com and follow Readme to install this can fix your issue. I had the same with T430, Win10 and resolved successfully.

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1 Posts

04-09-2017

United States of America

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Re: t420s discrete graphics issue

2017-04-09, 13:49 PM

Issue persists also to Windows 10.

I downloaded the ThinkPad Monitor INF File for Windows 10 (32-bit, 64-bit) - Laptop version 5.07 at 13/07/2015 and installed it.

Nothing changed, problem still exists.
Discrete graphics mode still causes freeze.

Please provide the solution to fix this problem. Thanks alot.

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33 Posts

12-17-2016

Sweden

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Re: t420s discrete graphics issue

2017-04-12, 19:03 PM

Have you tried to update your graphic and also the chipset drivers?
And if you have a update for BIOS or Intel Management Engine 11.6 Firmware try to update that as well.

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