One possible answer to my own question is, that AMD's ATI Catalyst driver disables the Xorg RandR extension and enables it's own RandR extention:
from /var/log/Xorg.0.log: [...] [ 68.714] (II) fglrx(0): RandR 1.2 support is enabled! [ 68.714] (II) fglrx(0): RandR 1.2 rotation support is enabled! [...] [ 69.541] (II) fglrx(0): Disabling in-server RandR and enabling in-driver RandR 1.2. [ 69.975] (--) RandR disabled [...] [ 69.975] (II) Initializing built-in extension RANDR [...] [ 92.101] (II) fglrx(0): Restoring Recent Mode via PCS is not supported in RANDR 1.2 capable environments Any idea, how to change this configuration? -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/881046 Title: Panning in a virtual monitor is not possible after upgrade to Ubuntu 11.10 To manage notifications about this bug go to: https://bugs.launchpad.net/xorg-server/+bug/881046/+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
