When editing text in Firefox (e.g. composing in gmail or editing a Trac wiki page), entire lines of text frequently disappear. Editing anything on them or selecting them causes them to reappear. This happens on two different Caicos (HD 6450) systems. One is running gnome-shell on Fedora 19, and the other is running Unity on Ubuntu 13.04. In the Fedora system, the driver version is xorg-x11-drv-ati-7.1.0-5.20130408git6e74aacc5.fc19.x86_64. The two machines have the same monitors. xrandr on the F19 system says: Screen 0: minimum 320 x 200, current 3360 x 1050, maximum 16384 x 16384 HDMI-0 connected primary 1680x1050+0+0 (normal left inverted right x axis y axis) 473mm x 296mm 1680x1050 60.0*+ 1280x1024 75.0 60.0 1152x864 75.0 1024x768 75.1 60.0 800x600 75.0 60.3 640x480 75.0 60.0 720x400 70.1 DVI-0 connected 1680x1050+1680+0 (normal left inverted right x axis y axis) 473mm x 296mm 1680x1050 60.0*+ 1280x1024 75.0 60.0 1152x864 75.0 1024x768 75.1 60.0 800x600 75.0 60.3 640x480 75.0 60.0 720x400 70.1 VGA-0 disconnected (normal left inverted right x axis y axis)
Please attach your xorg log and dmesg output.
Created attachment 83903 [details] Kernel log I've stripped out a bunch of irrelevant stuff. Let me know if you need more detail.
Created attachment 83904 [details] Xorg log This is from the F19 gnome-shell system.
For reference, here are other bug reports on this matter: Mozilla bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1204694 Ubuntu bug: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1301225 From what I gather, the bug occurs when running the open-source radeon and nouveau drivers, but not when using proprietary drivers (nvidia or fglrx). Perhaps a code base common to both open drivers is responsible? Here is a video I made showing how to repro this bug using Thunderbird: https://youtu.be/ybkVPSfiNJs
I'll also add my system info, if it's useful: ** My System ** OS: Kubuntu 14.04 64-bit w/ KDE SC 4.14.13 PC: HP Pavilion m6-1035dx CPU/GPU: AMD A10-4600M APU with Radeon HD 7660G Graphics RAM: 6GB DDR3 800 MHz Linux Kernel: 3.16.0-57-generic Screen Resolution: 1366 x 768
Does this still happen with current upstream versions of xserver and xf86-video-ati? If yes, does Option "AccelMethod" "glamor" work around it?
The latest radeon driver I've been able to test is from Ubuntu 15.10, "1:7.5.0+git20150819-0ubuntu1". The bug still happens with this version. However, the bug does not happen when using glamor acceleration. I should also mention that in Thunderbird, I am using the Verdana font. In my brief time testing for this bug in Ubuntu 15.10, I had a much easier time reproducing the bug when using Verdana vs. the default "sans-serif" or whatever Thunderbird is using by default.
I suspect this might be a bug in the xserver EXA code. Either way, I'm afraid the chances of it getting fixed are pretty slim at this point. With glamor from xserver 1.16 or newer, if that works well enough for you in general, I suggest that as a solution.
-- GitLab Migration Automatic Message -- This bug has been migrated to freedesktop.org's GitLab instance and has been closed from further activity. You can subscribe and participate further through the new bug through this link to our GitLab instance: https://gitlab.freedesktop.org/xorg/driver/xf86-video-ati/issues/76.
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