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Created attachment 493733 [details] Screenshot of vetical colour corruption Description of problem: When the Firefox window is of a certain size sometimes big vertical chunks of colour appear. Version-Release number of selected component (if applicable): firefox-4.0-2.fc15.i686 How reproducible: Somewhat reproducible on certain pages. Steps to Reproduce: 1. Start firefox . 2. Go to a page like http://tech.slashdot.org/story/11/04/20/164243/The-Government-Internet-ID-Proposal . 3. Scroll down a page at a time. Actual results: Sometimes (if the window is the right size) vertical line corruption will appear. Expected results: No corruption to appear. Additional info: This happens with the upstream Firefox 4 too and on Ubuntu 11.04 betas too.
Thanks for the bug report. We have reviewed the information you have provided above, and there is some additional information we require that will be helpful in our diagnosis of this issue. Please add drm.debug=0x04 to the kernel command line, restart computer, and attach * your X server config file (/etc/X11/xorg.conf, if available), * X server log file (/var/log/Xorg.*.log) * output of the dmesg command, and * system log (/var/log/messages) to the bug report as individual uncompressed file attachments using the bugzilla file attachment link above. We will review this issue again once you've had a chance to attach this information. Thanks in advance.
Created attachment 499058 [details] Xorg.0.log I have no /etc/X11/xorg.conf but here are the other requested files. For what it is worth, an Intel graphics driver developer thinks the problem lies there and not in Firefox.
Created attachment 499059 [details] dmesg
Created attachment 499060 [details] /var/log/messages
Previous logs were lacking the drm debug switch though. Of course, now I've gone to try and reproduce the issue I can't (perhaps because Slashdot has slightly redesigned its pages)...
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