[Intel-gfx] ILK output training hangs

[Dave Airlie]

On Tue, Aug 3, 2010 at 10:40 AM, Jin, Gordon <gordon.jin at intel.com> wrote:
> Dave Airlie wrote on Monday, August 02, 2010 6:39 PM:
>> On Mon, Aug 2, 2010 at 7:09 PM, Jin, Gordon <gordon.jin at intel.com>
>> wrote:
>>> Dave Airlie wrote on Friday, July 30, 2010 2:13 PM:
>>>> Current testing machine is an HP 2740p with Ironlake graphics.
>>>>
>>>> Test sequence:
>>>>
>>>> boot with no VGA plugged in.
>>>> get up to gnome logged in,
>>>> plug in VGA,
>>>>
>>>> one of three things occur,
>>>> a) it works,
>>>> b) it hangs in FDI link training (endless while loop wtf?)
>>>> c) it gets past the hang but nothing on the monitor.
>>>>
>>>> If (a) happens and I suspend/resume the monitor invariably gets
>>>> wrong timings, in this case it appears we set the fbcon mode, but
>>>> when we go to change to the X mode, the PCH DPLL won't accept the
>>>> new values.
>>>> It won't even dpms off.
>>>>
>>>> Just posting in case anyone else can reproduce or has any insight,
>>>> I'm not running a fully upstream kernel (testing on RHEL6 with lots
>>>> of backports). and we don't  seem to have a tree with all the
>>>> patches on the list collected.
>>>
>>> I can't reproduce it on Thinkpad T410 (also with Ironlake graphics)
>>> with 2.6.35-rc6 kernel. I've performed 10 times of the test
>>> sequence.
>>
>> Does the T410 have eDP? I think it only matter with eDP where the FDI
>> isn't setup by the BIOS.
>
> No, my T410 has LVDS not eDP. Would you file a bug on fd.o so it could be tracked?
>

I'll just make sure I can reproduce everything on master, at the
moment I'm hitting the BSD_RING breaks suspend with drm-intel-next.

Also I'm seeing the dpms on twice in a row issue, I'll send a trivial
fix that seems to avoid it, so far drm-intel-next seems to be a bit
happier than what I was using before.

Dave.