Forwarding this bug from Ubuntu reporter Jarrett Chisholm: http://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/737967 [Problem] Vertical pixel columns are missing from every 20-50th character in text in firefox and other applications. See screenshot. [Original Description] Basically, text in Ubuntu tends not to draw quite right. Please see the attached screenshot (desktop1.png) for a visual. I've noticed this happening in Ubuntu, Thunderbird, and Eclipse (the main 3 programs I use). DistroRelease: Ubuntu 11.04 Package: xorg 1:7.6~3ubuntu11 ProcVersionSignature: Ubuntu 2.6.38-1.28-generic 2.6.38-rc2 Uname: Linux 2.6.38-1-generic i686 Architecture: i386 CompositorRunning: compiz Date: Fri Mar 18 22:17:57 2011 DistUpgraded: Log time: 2011-02-04 18:07:51.411927 DistroCodename: natty DistroVariant: ubuntu GraphicsCard: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller [8086:27a2] (rev 03) (prog-if 00 [VGA controller]) Subsystem: Dell Device [1028:01d4] MachineType: Dell Inc. Latitude D520 SourcePackage: xorg UpgradeStatus: Upgraded to natty on 2011-03-09 (9 days ago) dmi.bios.date: 05/28/2007 dmi.bios.vendor: Dell Inc. dmi.bios.version: A06 dmi.board.name: 0NF743 dmi.board.vendor: Dell Inc. dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA06:bd05/28/2007:svnDellInc.:pnLatitudeD520:pvr:rvnDellInc.:rn0NF743:rvr:cvnDellInc.:ct8:cvr: dmi.product.name: Latitude D520 dmi.sys.vendor: Dell Inc. version.compiz: compiz 1:0.9.4-0ubuntu5 version.libdrm2: libdrm2 2.4.23-1ubuntu3 version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.1-0ubuntu2 version.xserver-xorg: xserver-xorg 1:7.6~3ubuntu11 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.0-0ubuntu2 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.14.0-4ubuntu2 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110107+b795ca6e-0ubuntu5
Created attachment 44721 [details] XorgLog
Created attachment 44722 [details] XorgConf.txt
Created attachment 44723 [details] CurrentDmesg.txt
Created attachment 44724 [details] desktop1.png
Hi Chris, Let me know if you need any info from me. I've added myself to the cc list, but here is my e-mail anyway: chisser98@yahoo.com Cheers
*** Bug 35995 has been marked as a duplicate of this bug. ***
I have to admit to being baffled. I can grasp at loose straws for the kernel bugs for misaligning the tiled buffers.... So does Option "Tiling" "False" make any difference?
(In reply to comment #7) > I have to admit to being baffled. I can grasp at loose straws for the kernel > bugs for misaligning the tiled buffers.... > > So does Option "Tiling" "False" make any difference? Hi Chris, I'm not sure what option that would be. However, I've since installed Linux Mint 10 LXDE over my old Ubuntu installation and no longer have any issues with text. On a side note, I had been upgrading my Ubuntu installation since 8.10 - maybe there was an issue during one of the upgrades that lead to these text issues? Just a thought. Cheers Jarrett
The crazy idea I had was that font-rendering itself was just wrong, perhaps some stale font data and freetype going mad. But I couldn't convince myself of that as the errors were too inconsistent. On the other hand, the kernel bugs are more likely to cause GPU hangs and even more severe corruption. The option was a reference to xorg.conf under Section "Driver". But if you can't reproduce it any more, then there is little to chase down and I shall focus on the residual bugs. Please reopen if you ever see this again! Thank you for the report.
(In reply to comment #9) > The crazy idea I had was that font-rendering itself was just wrong, perhaps > some stale font data and freetype going mad. But I couldn't convince myself of > that as the errors were too inconsistent. On the other hand, the kernel bugs > are more likely to cause GPU hangs and even more severe corruption. > > The option was a reference to xorg.conf under Section "Driver". But if you > can't reproduce it any more, then there is little to chase down and I shall > focus on the residual bugs. > > Please reopen if you ever see this again! Thank you for the report. heh bizarre. If I ever encounter this again, I'll be sure to reopen the bug. Cheers Jarrett
Created attachment 48442 [details] system info generated by debian bug report script for Andreas I'm still encountering the bug. System info attached.
Andreas can you please attach a screenshot so I can see if it is the same bug as Jarretts and not one of the other 915GM bugs?
Created attachment 48443 [details] screenshot illustrating the issue At the moment, only the lower part of the 's' is missing. After a while of having that same server running, usually more parts of more letters disappear. (I can post another screenshot next time it gets bad.)
Ok, that is a different bug, where the glyph cache itself gets corrupted, e.g. bug 36326. What's different about Jarrett's bug is that it involves the individual rendering of certain glyphs, more like in some cases that the kernel is wrong and glyphs overlapped with the wrong operator, and did not demonstrate global corruption of a glyph. Hence its oddity.
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