For your information: This bug exists obviously on more machines than one, but not on all Dell Latitude e6420 machines, but on some others. I guess it has something to do with the video card installed, anyway, I already filed a bug report back in 3/2011.
Upstream bug: https://bugs.freedesktop.org/show_bug.cgi?id=35812 I'm currently on trying to reproduce the error for Daniel Vetter on 3.5-rc4. If it is still reproducable, we will try to track down this bug. Background: In times pre-3.2, this happened during KMS. It did not happen with kernel 3.2.8 (no clue why!). I am not sure about 3.3, since I never used 3.3 (did stay with 3.2.8 - it worked). Since 3.4 it happens (for me) only on X login, not at KMS stage! What KMS and the X-Login (on KDE) have in common? A resolution change. KMS changes the screen resolution, KDM is displayed afterwrads (in a wrong resolution), and after login it does set the resolution to the chosen one, where I personally get stripes today. I am not using ubuntu but chakra, so this is definitely no ubuntu issue, but an upstream one. I tried that with arch and fedora as well - same results. The situation has gotten better, but it seems the bug we formerly had in the KMS is now in the X11 resolution change. Even though, I could not reproduce it (yet) changing resolution after I logged in successfully. @Screen Flickering: This is NOT an issue, the screen won't break! I have had it running having the stripes for a day(!), and ye, it did flicker a lot afterwards. If you leave your laptop alone, shut down, it will not flicker after a few hours of resting. Since this bug got more attention now again by the intel guys (always very helpful and nice I gotta' say), I hope we can track it down for future kernel versions. Hope this helps to accept the bug report and get it to [upstream]. Maybe some others are willing to help as well. ** Bug watch added: freedesktop.org Bugzilla #35812 https://bugs.freedesktop.org/show_bug.cgi?id=35812 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/794474 Title: latitude e6420 screen flickering (sandy bridge intel video card) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/794474/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
