[Bug 78631] [gm45] kwin of KDE crashes without any notification after resuming from RAM on intel chipset with kernel 3.15

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=78631

Jani Nikula <jani.nikula at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|przanoni at gmail.com          |intel-gfx-bugs at lists.freede
                   |                            |sktop.org
            Summary|kwin of KDE crashes without |[gm45] kwin of KDE crashes
                   |any notification after      |without any notification
                   |resuming from RAM on intel  |after resuming from RAM on
                   |chipset with kernel 3.15    |intel chipset with kernel
                   |                            |3.15
             Status|NEEDINFO                    |RESOLVED
                 CC|                            |chris at chris-wilson.co.uk
           See Also|                            |https://bugs.freedesktop.or
                   |                            |g/show_bug.cgi?id=76554
         Resolution|---                         |MOVED

--- Comment #4 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to Ukyoi D from comment #1)
> Here is a more professional report about the issue:
> https://bugs.archlinux.org/task/41045

Ahah, if that's the bug, it's mitigated by

commit ece4a17d237a79f63fbfaf3f724a12b6d500555c
Author: Jiri Kosina <jkosina at suse.cz>
Date:   Thu Aug 7 16:29:53 2014 +0200

    drm/i915: read HEAD register back in init_ring_common() to enforce ordering

and *possibly* fixed by

commit 95468892fdfeef6d1004b524e35957629efdbe00
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Thu Aug 7 15:39:54 2014 +0100

    drm/i915: Reset the HEAD pointer for the ring after writing START

In any case this is tracked at
https://bugs.freedesktop.org/show_bug.cgi?id=76554

Thanks for the report.

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