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T420, Black screen after switching to discrete graphics in BIOS

T400/410/420 and T500/510/520 series specific matters only
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zoboomafo
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Joined: Sun Sep 08, 2019 8:56 pm
Location: San Diego, California

T420, Black screen after switching to discrete graphics in BIOS

#1 Post by zoboomafo » Sun Sep 08, 2019 9:09 pm

I was trying to get my t420 to use the Nvidia 4200m graphics in liunx so i went into the BIOS and changed the display to Discrete. Now it boots to a black screen. The back light turns of for a few seconds then goes out. It appears to be booting normally and i was able to navigate the BIOS blind to switched it back integrated. I tried to update my bios. Its now on bios version 1.52 and still has the same problem. I have a 1080p screen installed. Could that be causing the problem? Or is my Nvidia chip dead?

zoboomafo
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Joined: Sun Sep 08, 2019 8:56 pm
Location: San Diego, California

Re: T420, Black screen after switching to discrete graphics in BIOS

#2 Post by zoboomafo » Mon Sep 09, 2019 10:59 pm

Can someone confirm wether or not the discrete graphicss setting in bios works with the 1080p screen upgrade?

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Re: T420, Black screen after switching to discrete graphics in BIOS

#3 Post by RealBlackStuff » Tue Sep 10, 2019 12:33 am

Check the "stickies" at the top of this forum page for the FHD upgrade kits.
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zoboomafo
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Joined: Sun Sep 08, 2019 8:56 pm
Location: San Diego, California

Re: T420, Black screen after switching to discrete graphics in BIOS

#4 Post by zoboomafo » Tue Sep 10, 2019 9:18 am

I have. There is no mention of anyone attempting to change to discrete in bios. I'm just going to have to assume my Nvidia chip is dead and order a new motherboard.

freeagent
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Re: T420, Black screen after switching to discrete graphics in BIOS

#5 Post by freeagent » Sat Nov 09, 2019 4:47 pm

I'm just going to have to assume my Nvidia chip is dead and order a new motherboard.
In doing some troubleshooting, I also had that black screen happen. This on my T520. I also had nvidia disappear altogether from Device Manager. I have Win7, so not the same as Linux, but all I did, was turn power off. Then restart computer into BIOS and switch back to another Display setting. Finally got back to working system with Nvidia and Intel showing in device manager.

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