** Description changed: - This bug has now been found to affect users of fglrx and intel graphics - drivers. It could possibly affect nvidia too. + This bug has been found to affect users of fglrx (ATI/AMD) and Intel + graphics drivers. NVIDIA users should look to bug 92599 instead. 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. fglrx: 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. intel and possibly any driver: Press WinKey+S or WinKey+W rapidly to trigger the expo/workspace animations. These are full-screen animations. 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/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
