(Untargetting obsolete release) ** No longer affects: compiz (Ubuntu Oneiric)
** No longer affects: fglrx-installer (Ubuntu Oneiric) -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to fglrx-installer in Ubuntu. https://bugs.launchpad.net/bugs/763005 Title: fglrx driver + compiz's "Sync to Vblank" makes display stutter/slow Status in Compiz Core: Fix Released Status in Ubutter: Making Ubuntu buttery smooth: Fix Released Status in “compiz” package in Ubuntu: Fix Released Status in “fglrx-installer” package in Ubuntu: Confirmed Bug description: [Impact] The user's display only redraws at 20-30Hz (1/3-1/2 of the correct monitor refresh rate). Making a highly unpleasant graphics experience. [Development Fix] Simplified the way the compiz opengl plugin does vsync, using fewer functions and simpler code. This works around the slow functions in the fglrx driver which are the root cause. [Stable Fix] As above. [Test Case] Make sure "Sync To VBlank" is enabled in the OpenGL section of CompizConfig Settings Manager. In Ubuntu 11.04 it is enabled by default. Drag some windows around. Also open and close windows. The animations will not be smooth as they appear to stutter. The framerate is only around 20-30Hz. Now turn "Sync To VBlank" off and repeat the above steps again. If you notice the animations are much smoother than with "Sync To VBlank" on then you are suffering from this bug. [Regression Potential] Low. Worst case: Video tearing occurs. However this is unlikely given the fix has been in everyday use by many users of ppa:vanvugt/compiz for many months already. [Original Report] This bug is primarily for users of the fglrx driver, but the proposed fix does improve performance with other drivers. Most NVIDIA users should look at bug 92599 instead. Package: fglrx Version: 2:8.840-0ubuntu2 01:00.0 VGA compatible controller: ATI Technologies Inc Juniper [Radeon HD 5700 Series] I have ATI's 5770 with fglrx. Having "Sync to Vblank" on makes Unity and many Compiz features (Enhanced Zoom, Scale etc.) really slow. Turning "Sync to Vblank" off has a huge effect on desktop, responsiveness is much, much better. Turning "tearing" off/on from amdccle doesn't seem to have any effect on responsiveness. In Maverick "Sync to Vblank" was off by default, in Natty it's on. This will probably have a huge impact on many fglrx users. To manage notifications about this bug go to: https://bugs.launchpad.net/compiz-core/+bug/763005/+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