linux-kernel - Re: [Intel-gfx] [REGRESSION] Linux 4.9-rc4: gfx glitches on Intel Sandybridge (was: Re: Linux 4.9-rc4)

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Date:   Wed, 09 Nov 2016 09:20:31 +0100
From:   Martin Steigerwald <martin@...htvoll.de>
To:     intel-gfx@...ts.freedesktop.org
Cc:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Intel Gfx Mailing List <intel-gfx@...edesktop.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [Intel-gfx] [REGRESSION] Linux 4.9-rc4: gfx glitches on Intel      Sandybridge (was: Re: Linux 4.9-rc4)

Am Dienstag, 8. November 2016, 16:17:59 CET schrieb Martin Steigerwald:
> Am Dienstag, 8. November 2016, 16:11:31 CET schrieb Martin Steigerwald:
> > Am Montag, 7. November 2016, 19:09:36 CET schrieb Jani Nikula:
> > > On Mon, 07 Nov 2016, Martin Steigerwald <martin@...htvoll.de> wrote:
> > > > It is also the same kind of corruptions as shown in
> > > > 
> > > > [Bug 177701] warning in intel_dp_aux_transfer
> > > > https://bugzilla.kernel.org/show_bug.cgi?id=177701
> > > > 
> > > > Just compare
> > > > 
> > > > https://bugzilla.kernel.org/attachment.cgi?id=241801
> > > > 
> > > > with
> > > > 
> > > > https://martin-steigerwald.de/tmp/display-issues-with-kernel-4.9-rc4.p
> > > > ng
> > > > 
> > > > 
> > > > However that bug report links to
> > > > 
> > > > https://bugs.freedesktop.org/show_bug.cgi?id=97344
> > > > 
> > > > yet the patch mentioned in there does not fix the issue. So I wonder
> > > > whether bug #97344 and bug #177701 are really the same.
> > > 
> > > They are the same, it's just that #177701 conflates two issues, a
> > > warning (tracked at fdo #973449) and a graphics corruption. The latter
> > > appears to be https://bugs.freedesktop.org/show_bug.cgi?id=98402.
> > > 
> > > The fix has now been pushed to drm-intel-fixes branch of
> > > http://cgit.freedesktop.org/drm-intel, which is -rc4 plus half a dozen
> > > latest fixes. Please try that and report back.
> > 
> > For now commit 54905ab5fe7aa453610e31cec640e528aaedb2e2 of drm-intel-fixes
> 
> I ment not exactly this commit, but this is the last commit in the branch as
> I compiled the kernel.
> 
> > branch seems to work okay. I can only test with laptop display at the
> > moment. But I will test with external display this evening – in case the
> > issue at hand is DisplayPort related.

Also no graphics glitches with external DisplayPort connected display.

*However*, I got a soft freeze and a hard freeze (well after about a minute I 
gave up and rebooted by pressing power button long enough to forcefully switch 
off the laptop) when playing PlaneShift using drm-intel-fixes branch.

Unfortunately I have no further time to debug any of this week, but it seems 
not all fixes are there are ready for next stable kernel.

Ciao,
Martin

> > I will add this information to fdo bug 98402 as well.
> > 
> > Thanks,
> > Martin
> > 
> > > > Of course I can report a bug at fdo as well, but I am a bit confused
> > > > whether it may not already have been reported. Well I hope I get a
> > > > chance to report it there as well and you get to decide.
> > > 
> > > If drm-intel-fixes doesn't fix the issue for you, please file a *new*
> > > bug over at the freedesktop.org bugzilla.
> > > 
> > > BR,
> > > Jani.


-- 
Martin