Here are some more pieces of information. * indeed there is no corruption, and it is quite stable (at least as stable as in the single screen config)
* if the "rotate" option is in xorg.conf, or if I do it manually after X is launched, with xrandr, the result is the same. * if I disable DRI in xorg.conf by adding Option "DRI" "false" then X won't start (black screen). However if I start without DRI AND without rotate, then I can rotate with xrandr, but the result is the same as before (slow). * the option Option "NoAccel" "true" has the same effect and disabling DRI above. * the option "AccelMethod" "EXA" or "XXA" has no visible influence * I have also tried to disable the laptop screen by xrandr --output=LVDS --off, but the result is still the same. I'm really out of clue here, sorry. I hope someone can make sense out of it. ** Attachment added: "xorg.conf" http://launchpadlibrarian.net/11327541/xorg.conf -- xorg very slow when rotated on external monitor https://bugs.launchpad.net/bugs/174650 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
