[Intel-gfx] i915.fastboot bug report - not working on coreboot

[Jesse Barnes]

On Thu, 23 Oct 2014 16:44:26 -0400
Charles Devereaux <intelgfx at guylhem.net> wrote:

> [    0.529733] [drm:intel_set_config_compute_mode_changes], modes are
> different, full mode set
> [    0.529736] [drm:drm_mode_debug_printmodeline], Modeline 0:"" 0 54167
> 1024 1048 1184 1344 768 771 777 806 0x0 0xa
> [    0.529740] [drm:drm_mode_debug_printmodeline], Modeline 11:"1024x768"
> 60 65000 1024 1048 1184 1344 768 771 777 806 0x48 0xa

This looks like the issue.  The BIOS programs a slightly different
1024x768 mode than what the kernel tries to apply.  Looks like reduced
vs non-reduced blanking approximately.

We could adjust the fastboot code to handle that, or change coreboot to
use the preferred mode from the EDID of the display or make the VBT
match, which is presumably what the kernel is using.

-- 
Jesse Barnes, Intel Open Source Technology Center