Hi,
On 17-06-16 22:37, David Airlie wrote:
----- Original Message -----
> From: "Hans de Goede" <hdegoede(a)redhat.com>
> To: kernel(a)lists.fedoraproject.org
> Cc: "Lyude" <cpaul(a)redhat.com>, "Rob Clark"
<rclark(a)redhat.com>
> Sent: Saturday, 18 June, 2016 1:52:07 AM
> Subject: Backporting skl_update_other_pipe_wm intel drm fixes to the Fedora 4.6
kernel
>
> Hi Fedora kernel team,
>
> If you look at:
>
>
https://retrace.fedoraproject.org/faf/problems/
>
> And look for skl_update_other_pipe_wm there, you will see
> that it is completely dominating the problem report stats
> (listed 4 times on the first page, 5 times on the second).
I talked to #intel-gfx, they said the warn was pretty harmless and we could
also just propose a stable patch to drop that warning.
The warning is mostly harmless, except in the cases where it isn't
when using display-port displays (including edp for laptop panels),
the warning is actually not harmless (it causes display fifo
under-runs leading to the lcd panel flickering to black and back
to the picture a few times every 5 minutes or so).
We've reports of similar flickering issues with external dp
monitors on skylake.
And according to Lyude it can even cause hangs in some cases.
Regards,
Hans
>
> Though I'm also okay with backporting fixes.
>
> Dave.
>>
>> As such I'm thinking about backporting the patches:
>>
http://www.spinics.net/lists/intel-gfx/msg95595.html
>>
>> To the Fedora 4.6 kernel.
>>
>> Some of the reported problems are only a WARN_ON triggering,
>> but there are also quite a few cases of actually wrong
>> watermark settings causing various real problems.
>>
>> These patches have been around for a long time, but they missed
>> the 4.6 merge window, and then also the 4.7 merge window, they
>> are in next now. But IMHO we should grab them now since the
>> problems they are causing are too big to wait for 4.8
>> hitting Fedora.
>>
>> So I would like to backport these to the 4.6 Fedora kernel
>> and have this completed before we start pushing 4.6 updated
>> to updates-testing. This way we can use the entire Fedora 4.6
>> testing phase to also test the backported fixes.
>>
>> Before I spend time on this, does this sound like a good
>> plan ? I've already discussed this within the graphics
>> team and the consensus there seems to be that this is a good
>> idea.
>>
>> Regards,
>>
>> Hans
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>>
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>>