** Description changed: This bug has now been found to affect users of fglrx and intel graphics drivers. It could possibly affect nvidia too. - TEST CASE: - Make sure "Sync to Vblank" is enabled in the OpenGL section of - CompizConfig Settings Manager. + Make sure "Sync To VBlank" is enabled in the OpenGL section of + CompizConfig Settings Manager. In Ubuntu 11.04 it is enabled by default. fglrx: Drag some windows around. Also open and close windows. The - animations will not be smooth. They appear to stutter. The framerate is - only around 20-30Hz. + animations will not be smooth as they appear to stutter. The framerate + is only around 20-30Hz. intel and possibly any driver: Press WinKey+S or WinKey+W rapidly to trigger the expo/workspace animations. These are full-screen animations. - If they don't appear perfectly silky smooth then you are probably - suffering from this bug. Unless you happen to have a very old machine. + But are they silky-smooth? + + 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. ORIGINAL DESCRIPTION: 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.
-- You received this bug notification because you are a member of compiz packagers, which is subscribed to compiz in Ubuntu. https://bugs.launchpad.net/bugs/763005 Title: Compiz's "Sync to Vblank" makes display stutter/slow with some drivers (like fglrx) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/763005/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~compiz Post to : compiz@lists.launchpad.net Unsubscribe : https://launchpad.net/~compiz More help : https://help.launchpad.net/ListHelp
