[Bug 88584] New: Font and screen corruption in GTK+ applications

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88584

            Bug ID: 88584
           Summary: Font and screen corruption in GTK+ applications
           Product: xorg
           Version: 7.6 (2010.12)
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: psychonaut at nothingisreal.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

After running my system for some time (several hours or days), certain text
characters in GTK+ applications become blank or garbled.  This renders these
applications completely unusable until I restart.  (See the attached
screenshots.)  Qt applications are unaffected.

I'm not sure if this is related, but in addition to the font corruption,
sometimes I get black boxes or black streaking over non-text elements of GTK+
applications.

It's not clear to me what the cause of the problem is.  There's a Debian bug
report at <https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=760435> which
suggests that the problem is in libglib.  However, there are also several
freedesktop.org bug reports for the Intel video driver which describe similar
symptoms.  In particular, my font corruption looks just like Attachment 35720
of Bug 28151 and Attachment 37173 of Bug 20560.  I think it's more likely a
problem with the Intel driver than with libglib, since I didn't notice any
problems after my last update to libglib (from 2.38.2 to 2.42.0 on 3 December
2014) but I did start enountering this problem after migrating my OS from a
system with an Nvidia card to one with a Core Processor Integrated Graphics
Controller.

I am running KDE 4.14.3 on openSUSE 13.2 for x86-64.  I am using xorg 7.6 and
version 2.99.916 of the i915 driver.  My graphics card is a   Elsewhere on the
web this problem has been reported on ArchLinux and Kubuntu:
<https://bbs.archlinux.org/viewtopic.php?id=186783>  I have reported the
problem downstream on the openSUSE bug tracker:
<https://bugzilla.novell.com/show_bug.cgi?id=913425>

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