(In reply to comment #6) > Userspace is not a problem here, many distributions have GL implementation > switch tools already. >
Userspace is the problem. > > The problem is that xf86-video-ati is built with KMS and radeon.ko loads with > modeset=1 but still, X fails to load due to the initialization (bug?) issue > reported by the OP. Restarting X fixes the problem. I do think there is > something to fix here and it would be nice to at least fix this chicken/egg > issue. You need to have the kernel module loaded before starting X. The same is true of other KMS drivers (intel, nouveau, etc.). If the drm is not loaded, the ddx assumes UMS and tries to load the drm. If it loads in KMS mode, you don't want two drivers handling the same hw, so the ddx bails to prevent that. If you try and load the drm from X and assume that the kernel is in KMS mode, you break old systems with old kernels that don't support KMS. The other problem with having the ddx load the drm for KMS mode is that with KMS, the drm handles all of the chip init. With UMS when you load the drm in UMS mode, the kernel module doesn't do anything at load time; it just waits until userspace inits the hw and actually decides to use the drm. With KMS, we have no way of knowing when the KMS drm has finished loading or initializing the hw so we may end up trying to use the KMS drm before it's properly loaded. It's not a configuration we want to support. -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-ati in Ubuntu. https://bugs.launchpad.net/bugs/534662 Title: [RV635] No hardware acceleration on ATI Radeon 3650 HD using 'radeon' driver To manage notifications about this bug go to: https://bugs.launchpad.net/xserver-xorg-driver-ati/+bug/534662/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
