[gutsy] animations and video watching aren't possible with an external monitor on an Intel laptop

[unggnu]

Binary package hint: xserver-xorg-video-intel

I am using a Sony TX2 laptop which is shipped with Intel 915 onboard graphic. I have checked the new Intel driver with the second Ubuntu Gutsy Live CD (Tribe 3) which is shipped with the xserver-xorg-video-intel (2:2.1.0-1ubuntu1) driver and Xorg 7.3 git. It works fine with my external monitor (1680x1050) if I change the driver from "i810" to "intel" in xorg.conf but it doesn't shut down the LFP like the old i810-modesetting driver. It always show an extract of the external on the LFP (1366x768). It is possible with xrandr to disable LFP (xrandr --output LVDS --off) but Video watching or 3D animations are still impossible because of huge lags and displaced output. It seems that the monitor was disabled but the graphic card doesn't realized that. I don't have this problems with videos with i810-modesetting since this disables the monitor in xorg.conf with MonitorLayout.
But since i810-modesetting couldn't display my native laptop resolution I have to switch between the standard i810 driver (the Feisty intel driver couldn't display 1366x768 too) and modesetting everytime I want to use the external or the internal.

[unggnu (unggnu)]

This seems to be fixed in current Gutsy. The problem with Clone mode is still there but this could be fixed through adding something like that to /etc/gdm/Init/Default:

#disable lfp if external monitor is connected
if xrandr | grep -q "VGA connected"
then
        xrandr --output LVDS --off
fi

Compiz works but it is very slow on 1680x1050 screen. Maybe it is fault of the weak i915 chip.

[unggnu (unggnu)]

Through some testings with the intel crash bugs I have removed the intel driver overlay fix of bug # 39050 which results in the same problem. Without it video watching is nearly impossible because of lags and fractals and so on.

[unggnu (unggnu)]

Sorry, the patch is from bug # 111257.