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

[Jesse Barnes]

On Tue, 26 Aug 2014 13:09:54 -0400
Charles Devereaux <intelgfx at guylhem.net> wrote:

> Hello
> 
> I'm trying to use i915.fastboot on a Thinkpad X60t. The bios has been
> replaced by coreboot, which supports native video init.
> 
> The goal is to boot to a console on a debian in less than 2 seconds
> (kernel
> + systemd), systemd is just fine in 0.6s but the kernel takes a long
> time, with apparently 1 full second spend on the video mode
> initialization, just as if fastboot was ignored.
> 
> Coreboot is starting a grub2 payload, which is in the appropriate vesa
> mode, and has option set gfxpayload=keep to pass it to the kernel.
> 
> The 3.14.16 kernel start in the appropriate vesa mode, but there is
> some flickering at one time, which indicates the drivers tries to
> reinitialize the video card, before returning to this same mode.

Your config looks ok, but it sounds like the i915 driver may be doing a
full mode set.  Doing a drm.debug=6 with fastboot enabled should give
us clues about why in the dmesg.

Jesse