[Bug 77142] New: Garbled text in Gtk2 applications

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=77142

          Priority: medium
            Bug ID: 77142
          Assignee: dri-devel@lists.freedesktop.org
           Summary: Garbled text in Gtk2 applications
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: e.durmin@gmx.net
          Hardware: x86 (IA32)
            Status: NEW
           Version: 10.1
         Component: Drivers/Gallium/r300
           Product: Mesa

Created attachment 97046
  --> https://bugs.freedesktop.org/attachment.cgi?id=97046&action=edit
A small snapshot from Firefox showing garbled text

I'm seeing this issue on my computer with the Radeon-9500-AGP (r300) using the
opensource drivers since the beginning of this year. That means that this issue
may have started since version mesa-10.0.0. I'm using mesa-10.1.0 now.

I've tested a Radeon-3650-AGP (r600) on the same computer for a few days and
noticed the same issue.

The garbled text is sometimes noticeable in the UI of the application like
menus, but it is always noticeable when a lot of text is shown, for example in
Firefox showing a webpage with a lot of text.

In Firefox:
The garbled text is not shown on all lines: some lines will have garbled text,
while most other lines will show the text correct. Sometimes the text is so
severily garbled that it is not readable anymore.
Selecting the line with the garbled text with the mouse (as if doing a copy &
paste action) will change (redraw?) the garbled text and usually correcting the
garbled letters.

The text is not garbled in Qt/KDE applications.

This issue disappeared when in xorg.conf EXAPixmaps or RenderAccel is disabled
(both are enabled by default).
After doing this "fix" text will not be garbled anymore, but scrolling in
Firefox (and possible other applications) is much slower/less smooth.

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