Machine: Asus "Zenbook" UX501 CPU: i7 4720HQ GPU: Intel HD4600 Kernel 4.3.2 OS: Kubuntu 15.10 After enabling FBC with kernel option "i915.enable_fbc=1" the screen flickers with specific video content. Typically Firefox browser with some page. As an example the "https://01.org/linuxgraphics/community/kernel" at the default zoom level. Please note that my notebook has 4k display. I have seen the issue only on the built-in panel, not on an external screen. The flickering typically looks like the picture is switching between correct look and the same picture shifted down. The Y offset varies depending on the content. So does the flickering frequency. In the above example the offset is about half of the screen height. If the content changes, e.g. change the zoom level in Firefox (on the above example it's sufficient to scroll down to the text so the picture disappears), the flickering changes or disappears.
Created attachment 119524 [details] Video record of the issue
Hi Does this problem still happen if you use the most recent drm-intel-nightly branch from http://cgit.freedesktop.org/drm-intel ? Thanks, Paulo
Closing bug due to no response from the bug reporter in 10 months, plus the fact that we fixed a huge pile of FBC bugs after this bug was reported. If you think the bug is still present, feel free to reopen it, but please test it against a newer Kernel with drm.debug=0xe and provide the dmesg output. Thanks, Paulo
Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.