[Bug 77142] New: Garbled text in Gtk2 applications

[Bug 77142] New: Garbled text in Gtk2 applications

[bugzilla-daemon]

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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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[Bug 77142] Garbled text in Gtk2 applications

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

eric <e.durmin@gmx.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #97046|text/plain                  |image/png
          mime type|                            |

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[Bug 77142] Garbled text in Gtk2 applications

[bugzilla-daemon]

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

eric <e.durmin@gmx.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |major
           Priority|medium                      |high

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[Bug 77142] Garbled text in Gtk2 applications

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

--- Comment #1 from Alex Deucher <agd5f@yahoo.com> ---
Does adding radeon.agpmode=-1 to the kernel command line in grub help?  You can
also try setting it to 1, 2, 4, or 8 to force the agpmode.

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[Bug 77142] Garbled text in Gtk2 applications

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

--- Comment #2 from eric <e.durmin@gmx.net> ---
The problem I've described in the top comment, is when using agpmode=4. 

I somehow can not use agpmode=8.
When agpmode is set to 8, the X server will not start. Loading the radeon
module with modprobe is no problem, but starting the X server, for example with
startx, will hang the computer. Xstart should open 3 xterm windows, but during
the opening of the first xterm window the computer hanged.

When setting agpmode to 1 or 2, I get this message:
[drm:radeon_agp_init] *ERROR* Illegal AGP Mode: 1 (valid 4, 8), leaving at 8

So I can only set agpmode to -1.

With agpmode=-1 the garbled text has disappeared.
But certain movements on the screen can not keep up with the mouse movement.
For example when moving around a window with the mouse (I use KDE's wobbling
window) and scrolling a long webpage by dragging the vertical slider up and
down with the mouse in Konqueror/Rekonq (Firefox doesn't have this problem).

The movement on the screen is smooth, but it is more behind the mouse than when
agpmode is set to 4.

Setting agpmode to -1 is a better solution than disabeling EXAPixmaps or
RenderAccel.

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[Bug 77142] Garbled text in Gtk2 applications

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

eric <e.durmin@gmx.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |NOTABUG

--- Comment #3 from eric <e.durmin@gmx.net> ---
Today I've replaced the Radeon-9500-AGP with a Radeon-HD2400Pro-AGP.

Text in Gtk2-apps are good even when using agpmode=8. No sign of garbled text.

After inspection of the Radeon-9500, I see 4 bulging capacitors... so maybe
that was the reason of the garbled text and the inability to use agpmode=8.

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