Created attachment 1073347 [details] A video demonstrating the tearing Description of problem: I see visible, ragged tearing of the video (as if bunches of lines are updating at random) in the top 200 or so pixels of my display. The attached video shows this. (It's not an artefact of the recording, the video shows what it looks like to my eyes.) This happens when I first log in, or lock the screen and then unlock it. If I change to a text-mode VT and back, the tearing disappears. The machine is a Lenovo C50-30 all-in-one, and I'm running the display at 1920x1080. The graphics is the Intel HD5500 that comes with the i5-5200U processor. There's also a Nvidia 820A on the board in an Optimus slave configuration, but to my knowledge it's not being used (and I've no intention of trying to do so, either). dmesg and Xorg.0.log attached. Version-Release number of selected component (if applicable): kernel-4.1.6-201.fc22.x86_64 xorg-x11-drv-intel-2.99.917-15.20150729.fc22.x86_64 How reproducible: Always. Steps to Reproduce: 1. Lock screen, allow it to switch off. 2. Unlock screen. 3. Move a window around the top of the screen. Actual results: Tearing. Expected results: No tearing. Additional info:
Created attachment 1073348 [details] dmesg
Created attachment 1073349 [details] Xorg.0.log
Booting with i915.enable_ips=0 seems to help.
Updating versions, still happens with: kernel-4.2.6-301.fc23.x86_64 xorg-x11-drv-intel-2.99.917-16.20150729.fc23.x86_64 As pointed out earlier, using i915.enable_ips=0 still helps but the tearing is still sometimes seen intermittently. Surrounding circumstances unknown, but typically after I've bumped the 'Activities' hot corner in GNOME Shell a few times. I've also spotted another tear along the bottom of the GNOME Shell panel bar, so about 24 pixels down. This is visible in the ripples when the hot corner is activated -- ripples in the upper 24 pixels seem a frame or two behind the others. Also when dragging a window along the top of the screen (so just below the panel) there's a delay visible in the top pixels of the window decoration. I think I've also seen similar on older HD3000 graphics on occasion...
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