Created attachment 406872 [details] The tearing effect when moving cursor up. The artifacts disappear soon after motion stops. Description of problem: Drawing on rotated screens (especially external ones) with Intel graphics is slow. Even relatively slow movement tears and leave blocky artifacts wich disappears after a short while. Running a hardware accelerated application (glxgears) at the same time makes the drawing much faster (the tearing can still be observed, but the artifacts are corrected very fast). The error does not happen when running compiz. Version-Release number of selected component (if applicable): 2.6.33.1-24.fc13.x86_64 (fedora test day release) How reproducible: Almost always (depends on use of hardware acceleration). Steps to Reproduce: 1. Attach an external screen. 2. Start desktop without compiz. 3. Using Monitor Preferences, set the external monitor's rotation to Left. 4. The effect should be visible e.g. when scrooling in a drop-down menu. Actual results: Slow, ugly drawing resulting in non-persistent artifacts. Expected results: Fast, snappy drawing of windows and desktop components. Additional info: intel gl960 graphics, smolt profile: http://www.smolts.org/client/show/pub_af6a0a92-4c78-435e-b7a7-e7e6215fbe87
Confirm. Seeing the same on my lenovo x200 within integrated intel card. Lots of annoying artefacts.
On irc, #fedora-test-day, Adam Jackson (https://fedoraproject.org/wiki/User:Ajax) suggested, a more aggressive rotation blitting could solve the problem.
This looks like it's one of the problems I see on my 82G35 [8086:2982] (rev 03). I see it with both xorg-x11-drv-intel-2.10.0-4 and 2.11.0-1. It can look like bug 577142 at first, but closer study shows that it differs in several ways: · It happens with Metacity, not with Compiz. · It happens only when the screen is rotated. · I can reproduce it reliably. · It affects only the leftmost part of the changed area. Often it's a block some 10 to 20 pixels wide that doesn't get drawn. Only narrow elements such as cursors and checkboxes may be left out entirely. · When it affects tooltips they get corrected as soon as the mouse pointer moves. Otherwise the corruption lasts until anything other than mouse movements happens anywhere on the screen, for example a button that changes colours when the mouse moves over it. If I set the clock in the Gnome panel to display seconds, then the corruption disappears as soon as the second digits change. I'm adding Adam Jackson to the CC list as the problem seems specific to Intel graphics. I hope that's OK.
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