Created attachment 120893 DP debugging Tom, I would bother you again to provide some debugging info. From the dmesg you sent it seems that you are experiencing a lot of hpd interrupts. When that happens the driver checks if the DP channel equalization is still ok. On your case, channel equalization is not ok yielding DP link to be retrained. Of course, this causes flickering as the DP link is broken for some time. The patch I'm proposing for debugging purposes applies on top of the latest -nightly and on top of these previous patches
https://patchwork.freedesktop.org/patch/69394/ https://patchwork.freedesktop.org/patch/69395/ https://patchwork.freedesktop.org/patch/69396/ The patch adds more verbose debug information on channel equalization and limits the DP link retraining to 5. After 5 attempts to retrain the link you probably end up having a non-flickering display or a black screen. Please, report back with dmesg. -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to libdrm in Ubuntu. https://bugs.launchpad.net/bugs/1522922 Title: Screen flickering in Intel i915 driver To manage notifications about this bug go to: https://bugs.launchpad.net/nouveau/+bug/1522922/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
