[Intel-gfx] ILK output training hangs

[Dave Airlie]

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.

Dave.