[Bug 98108] New: To avoid text corruption in gnome menus and control panels I have to switch to "uxa"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98108

            Bug ID: 98108
           Summary: To avoid text corruption in gnome menus and control
                    panels I have to switch to "uxa"
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: a.sloman at cs.bham.ac.uk
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

I was asked to report this here after I inserted comment number 27 in
https://bugzilla.redhat.com/show_bug.cgi?id=1323762

The problem concerns corruption of text displayed on gnome utilities on my Dell
Latitude E6410 using intel graphics, running Fedora 22 and and Fedora 24 with
ctwm window manager.

I seem to have fixed the problem on that machine (using f24) by inserting
Option "AccelMethod" "uxa" in /etc/X11/xorg.conf.d/20-intel.conf, i.e. I
created a file /etc/X11/xorg.conf.d/20-intel.conf 
containing:

Section "Device"
   Identifier  "Intel Graphics"
   Driver      "intel"
   Option "AccelMethod" "uxa"
EndSection

based on instructions found here:
https://fedoramagazine.org/solution-graphics-issues-intel-graphics-chipsets-fedora-22/

Scanning bug reports I find different sorts of font/text corruption problems
reported. E.g. a different problem is reported on this site in
https://bugs.freedesktop.org/show_bug.cgi?id=95368

So similar wording in the bug reports may be misleading.

The problem I reported did not affect the vast majority of text displays,
including use of xterm, firefox and other browsers, liberoffice, other editors.
It affects *only* gnome related text corruption, e.g. in gnome-control-center
and other displays concerned with sound/volume control, sound recorder, and
networking. It also affected xclock.

I don't have any screenshots, and I have now fixed the problem on my laptop by
using the "uxa" option. However examples partly similar to the ones I
experenced are shown in attachments in various bug reports. The symptoms
include mainly missing characters, but in some cases characters are displayed
in a corrupted form, e.g. with black blotches.

Using google, I found similar bug reports, with similar sample images, on
several different web sites not part of the fedora or redhat bug reporting
mechanism, so it is not a problem specific to fedora. A few users reported
successful use of "uxa" instead of "sna" but in most cases users and their
advisors seem to be completely in the dark. So it looks as if a fix is needed
across distributions, without users having to edit configuration files, though
that has worked for me.

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