Chris, sorry for the slow response - things have been pretty busy here. Here's a dmesg generated with drm.debug=6. I'll also attach the X log file. Happy to perform any other debugging steps you like - just let me know.
** Attachment added: "dmesg generated with drm.debug=6" https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1177358/+attachment/3684660/+files/dmesg -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xserver-xorg-video-intel in Ubuntu. https://bugs.launchpad.net/bugs/1177358 Title: black line garbage flickers onto screen every few minutes Status in “xserver-xorg-video-intel” package in Ubuntu: New Bug description: I'm running Ubuntu 13.10 on a MacBookAir5,2. The machine has an Intel HD Graphics 4000 processor. Every few minutes, a bunch of garbage blank lines flickers onto the screen for a fraction of a second and then vanishes. I also saw this running 13.04 on the same machine, but never before that. It's impossible for me to capture a screenshot since it's completely unpredictable when this will happen. But it's pretty distracting. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1177358/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
