Red Hat Bugzilla – Bug 425401
GNOME bitmap font rendering corrupted with ATI Radeon driver 6.7.195 and XAA
Last modified: 2018-04-11 05:12:57 EDT
Description of problem:
GNOME applications show corrupted bitmap font rendering when XAA
acceleration is enabled on an ATI X800.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Login to GNOME session.
2. Open GNOME terminal.
3. Set terminal font to Lucida Typewriter.
Text rendering is badly broken.
Text is rendered in a readable form.
- This only affects GNOME applications [not plain X ones] like GNOME
terminal or gedit. Is this a cairo issue?
- Enabling EXA acceleration mode restores correct font rendering.
- Selecting corrupted text fragments or moving a window across the
terminal window makes the text [partially/temporarily] reappear.
- I'm not sure if the issue is specific to the ATI driver or a general
Created attachment 289401 [details]
Sample screenshot of GNOME terminal using LuciaTypewriter font
Created attachment 289511 [details]
xorg.conf created by anaconda
Created attachment 289521 [details]
Xorg.0.log for xorg.conf created by anaconda
*** This bug has been marked as a duplicate of 417241 ***
(In reply to comment #4)
> *** This bug has been marked as a duplicate of 417241 ***
I disagree: bug 417241 describes a very different issue. In my case, only
bitmap fonts are concerned whereas over there, it appears to be a general
problem. Moreover, no reference is made to whether the issue is related to
the acceleration architecture which is crucial for the current bug since
setting "accelmethod" to "exa" settles the issue [without being a proper
Whereas bug 417241 seems to have been solved by updating to driver
version xorg-x11-drv-ati-6.7.196-3.fc9, no progress here ..
In case it's useful, I'm seeing this on my RV370 (Radeon X550) with
xorg-x11-drv-ati-6.7.196-5.fc9 (also on x86_64), and setting "AccelMethod" "EXA"
likewise makes the problem go away.
I'm seeing this too, and for me setting "AccelMethod" "EXA" fixes things too.
I have an radeon 9800 XT on a fully up2date x86_64 rawhide. Downgrading to F-8
xserver and ati driver fixes things for me.
I've some limited experience with video debugging and good C-coding skills and I
would really like to see this fixed (EXA == slow on r300) please let me know
what I can do to help.
Interestingly, I switched to EXA, and it works fast on my r300! I was really
surprised. The one thing that is required is DRM working correctly. Without
radeon.ko loaded, it was really slow. Plus, I have PCIe (as opposed to AGP), so
that might make a difference (because of much faster card-to-RAM transfer).
After reading the related (duplicate?) bug 384631, which refers to:
Where the same problem is seen with intel graphics (which I've seen in the
beginning of F-9 too) I've decided to blame the X-server and I've downgraded my
xserver + xserver-sdk to the ones from F-8 updates and then rebuild the F-9
xorg-x11-drv-ati from CVS, and that works fine, so most likely not the ati
driver but the Xserver is to blame.
Note BTW that here:
Bill Nottingham says this is fixed for intel graphics with an intel driver
update, maybe the latest intel driver has switched to exa?
BTW this is pretty bad (also corrupts fixed width fonts in firefox, making
several websites including bugzilla unusable) so I'm adding this to the F-9 X
I think fp.o bug 13104 is the one of interest to us. It also has some hints
about where the problem really lays.
And it totally deserves to block F9.
*** This bug has been marked as a duplicate of 384631 ***