[Bug 77975] New: [855GM] X freezes for no apparent reason and reproducability

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77975

          Priority: medium
            Bug ID: 77975
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [855GM] X freezes for no apparent reason and
                    reproducability
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: 4607vrfcr84spd21f08 at weg-werf-email.de
          Hardware: x86 (IA32)
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
        Depends on: 77351
           Product: DRI

Created attachment 98046
  --> https://bugs.freedesktop.org/attachment.cgi?id=98046&action=edit
X process in htop

(this is orignating from https://bugs.freedesktop.org/show_bug.cgi?id=77351#c28
)

With driver version 
(II) intel(0): SNA compiled from 2.99.911-88-g58a757b
I experienced a *freeze* of keyboard (even numlock LED did not respond to
numlock key), mouse cursor and any screen change (old image is displayed) at
not good reproducible conditions. I did not recognize a pattern when exactly it
happens  (it occured only three times, I think it was never in idle but when
starting a big program or doing some work inside a program). 

Access to the machine via ssh and shutdown or kill of the X server is possible.

I had a look in the logs (Xorg.0.log and my system's journalctl) but did not
find any suspicious entry just before/at the freeze.

After this I had changed back again to the old version 2.99.910 for two days
and I did not experience a freeze anymore (as I never did up to last week).
Yes, the freezes may still have been caused by something else and randomness
may have caused no freezes since two days.

NEW:  
Tested the version 58a757b again since one day and got a freeze today.
Attachments are from this one. Note that the freeze occured while I was running
a program under another user account (via `xhost +LOCAL:`   and  `su
username`). However, I remeber that one of the first freezes was while I was
working with a program under my user account. 

Observation 1: X was still consuming a little bit of CPU (see htop attachment)
during the freeze.
Observation 2: Sound from a mp3 playing in vlc was continuing to play through
the speakers.
Observation 3: after a kill of X (along with all programs) and relogin
everything is fine again.

By chance I saw that during the freeze the mouse cursor was missing on my LVDS
although it should have been shown if I see correctly (see images
attached)(note that my external display is 1280x1024 and the LVDS is only
1024x768).

Attached also the requested stack and backtrace.

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
You are on the CC list for the bug.
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20140426/ac01cce5/attachment-0001.html>