linux-kernel - Re: [BUG][REGRESSION] mangled display since -rc1

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Message-ID: <87h97j8a4q.fsf@intel.com>
Date:   Mon, 07 Nov 2016 19:36:53 +0200
From:   Jani Nikula <jani.nikula@...ux.intel.com>
To:     Martin Kepplinger <martink@...teo.de>,
        Martin Steigerwald <martin@...htvoll.de>
Cc:     Thorsten Leemhuis <regressions@...mhuis.info>,
        Joerg Roedel <jroedel@...e.de>,
        Linux kernel <linux-kernel@...r.kernel.org>,
        torvalds@...ux-foundation.org, daniel.vetter@...el.com
Subject: Re: [BUG][REGRESSION] mangled display since -rc1

On Mon, 07 Nov 2016, Martin Kepplinger <martink@...teo.de> wrote:
> Am 2016-11-07 um 17:01 schrieb Martin Steigerwald:
>> Hello.
>> 
>> Am Montag, 7. November 2016, 16:34:35 CET schrieb Martin Kepplinger:
>>> Chris Clayton wrote off list and the mentioned patch fixes the problem
>>> for me too, as it does for others. I hope it make it's way into the tree
>>> soon:
>> 
>> With 4.9-rc4 I have corruptions that look like the ones reported in this 
>> thread.
>> 
>> I reported my finding on LKML thread about 3.9-rc4. And in Bugzilla in a bug 
>> report with an attachment that shows the same type of corruptions as here in 
>> this thread:
>> 
>> https://patchwork.freedesktop.org/patch/116808/
>> 
>> mentioned in the other bug report and the following LKML thread does not fix 
>> the issue for me:
>> 
>> Re: [REGRESSION] Linux 4.9-rc4: gfx glitches on Intel Sandybridge (was: Re: 
>> Linux 4.9-rc4)
>> https://lkml.org/lkml/2016/11/6/70
>> 
>> https://bugzilla.kernel.org/show_bug.cgi?id=177701#c4

That bug conflates two issues, with the main issue being unrelated to
corruption.

>> In my case it looks like this:
>> 
>> https://martin-steigerwald.de/tmp/display-issues-with-kernel-4.9-rc4.png
>> 
>> 
>>  I have a busy week, so I won´t to any bisecting at the moment. I am
>> happy to test another patch during breaks between holding the
>> training, but please point me specifically to what patch to
>> test. Thank you.
>
> this one: I just replaced max with roundup manually:

As I wrote in another thread, the fix has now been pushed to
drm-intel-fixes branch of http://cgit.freedesktop.org/drm-intel. It's
-rc4 plus half a dozen fixes, including "drm/i915: Round tile chunks up
for constructing partial VMAs" which should fix the corruption.

Please try that, and report back. If it doesn't fix the issue, please
file a bug at the freedesktop.org bugzilla.

BR,
Jani.

-- 
Jani Nikula, Intel Open Source Technology Center