Re: IVB-eDP regression with on latest git

[Oleksij Rempel <bug-track@fisher-privat.net>]

I'll repost it, looks like last message got lost.

Am 14.10.2012 14:49, schrieb Oleksij Rempel:
> Am 14.10.2012 10:55, schrieb Daniel Vetter:
>> On Sun, Oct 14, 2012 at 9:18 AM, Oleksij Rempel
>> <bug-track@fisher-privat.net> wrote:
>>> With latest kernel (vanilla/master, or intel.drm-next) i do not have
>>> image
>>> on build in screen (eDP). Hardware Asus Zenbook UX32A. Vendor: 0x8086,
>>> Device: 0x0166, Revision: 0x09 (??)
>>> Is it know issue?
>>
>> Nope, this is a new one. Can you grab the dmesg with drm.debug=0xe of
>> the broken kernel please? Also, a bisect usually helps a lot, too.
>>
>> Thanks, Daniel
>>
>
>
> I can't access this laptop with broken kernel.
>
> The patch caused this regression is:
> commit 2477367083b3eaa97f87993ab26627a02f350551
> Author: Chris Wilson <chris@chris-wilson.co.uk>
> Date:   Wed Sep 26 16:48:30 2012 +0100
>
>      drm/i915: Try harder to complete DP training pattern 1
>
>      In commit cdb0e95bf571dccc1f75fef9bdad21b167ef0b37
>      Author: Keith Packard <keithp@keithp.com>
>      Date:   Tue Nov 1 20:00:06 2011 -0700
>
>          drm/i915: Try harder during dp pattern 1 link training
>
>      extra passes were made to retry the same voltage and then retry a full
>      clock reset. However, as coverity pointed out, we never tried the full
>      clock reset as we broke out of the loop early.
>
>      Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
>      Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
>
>
> Reverting it makes laptop work again.
>


-- 
Regards,
Oleksij