Description of problem: Connecting my laptop (Lenovo T400s, http://www.smolts.org/client/show/pub_e98beafa-1ec5-4290-91df-777dedfc1be8) to an external screen, the image is often unstable, or for certain resolutions I never get a stable image. Even for resolutions which initially work, it often happens that after a few minutes the image suddenly breaks down (i.e. one can see on the screen that the computer still sends image data, but the sync is so off that the image is completely garbaged). Version-Release number of selected component (if applicable): 2.12.0-6.fc14
What external connection method are you using? VGA, DVI, HDMI... ?
ping? reporter? -- Fedora Bugzappers volunteer triage team https://fedoraproject.org/wiki/BugZappers
That was using VGA. I'm now running another distro with a newer kernel, and have since not had problems with external screens, at least not of the kind described here. I will happily test with F15 again once it's a tad more matured.
OK, setting needinfo, so this doesn't get lost and we know we are expecting feedback from the reporter. When you do so, 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 AFTER the problem happens but BEFORE reboot, 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.
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