[coreboot] Problems with NVidia on Lenovo ThinkPad T430

Christoph Pomaska christoph.pomaska at posteo.de
Wed Apr 4 15:25:14 CEST 2018

Hi Tobias,

I used UEFItool to extract the Nvidia option ROM, that wiki page under 
"UEFI method":


On the T430 I found two blobs, one of about 60k in size and one that's 
about double the size, but I wasn't able to properly test yet which one is 

Best regards
Christoph Pomaska / Sellerie

Am 4. April 2018 12:41:35 nachm. schrieb Tobias Dausend 
<t.dausend at openmails.org>:

Hello Tobias,

You can switch between GPUs by changing the value of the
hybrid_graphics_mode CMOS setting using nvramcui or nvramtool.
Currently, for the T430 this field can be set to either Integrated only
or Dedicated only. Make sure you are using CMOS for configuration
values. Unfortunately, I was unable to switch the power for the dGPU
off at all, which resulted in rather high power consumption even if
only the integrated GPU is enabled.

Micha? Kope?

thanks for the feedback. What version of Coreboot did you use? Is the
stable 4.7 enough or should I use a snapshot from the git-repository?
Also the question how to include the VGA-bios for the NVidia-card. I did
a compilation with the VGA-bios for Intel and included the rom
afterwards with cbfstool. Is this the correct way to do as "optional rom"?



coreboot mailing list: coreboot at coreboot.org

More information about the coreboot mailing list