[PATCH v3 01/13] firmware/sysfb: Fix EFI/VESA format selection

[Javier Martinez Canillas]

"Pierre Asselin" <pa at panix.com> writes:

Hello Pierre,

> Oh oh, I just reproduced the problem on a desktop tower, a Dell Precision
> T3610, probably 2019 vintage.  The only thing in common with the old
> laptop, that I can think of, is that both use the legacy BIOS.  The Dell
> has EFI but the graphics card may not support that; there is no integrated
> graphics, if I switch to EFI and lose the video I may not be able to switch
> back.
>

Can you please share you grub config file? It seems that is set to
GRUB_GFXMODE=1024x768x32 but the actual mode is set to 1024x768x24 ?

That is, it fails when the picked format is DRM_FORMAT_RGB8888 but
works when is DRM_FORMAT_XRGB888. I can't spot any error in Thomas'
patch so I wonder if the problem is with what grub is passing to the
kernel.

The mentioned vga=0x318 workaround that you mentioned makes the mode
passed to match the selected DRM_FORMAT_RGB888 which I guess is why
that worked for you.

-- 
Best regards,

Javier Martinez Canillas
Core Platforms
Red Hat