I have a related problem. Using a Thinkpad X200s with an LVDWS/WSXGA screen at
1440x900 @ 50 Hz,
I encounter problems after having used an external display with another
resolution. The laptop screen goes black and sometimes returns to a catatonic
state, even after reboot. The only solution I have found sofar is to boot my
xubuntu 9.04 in recovery mode and then reinstall xserver-xorg, which seems like
an overkill.
The output from xrandr (when on the laptop screen);
Screen 0: minimum 320 x 200, current 1440 x 900, maximum 1440 x 1440
VGA disconnected (normal left inverted right x axis y axis)
LVDS connected 1440x900+0+0 (normal left inverted right x axis y axis) 261mm x
163mm
1440x900 50.0*+ 59.9 50.0*
1360x768 59.8
1152x864 100.0 85.1 85.0 75.0 75.0 70.0 60.0
1024x768 85.0 75.0 70.1 60.0
832x624 74.6
800x600 85.1 72.2 75.0 60.3 56.2
640x480 85.0 72.8 75.0 59.9
720x400 85.0
640x400 85.1
640x350 85.1
HDMI-1 disconnected (normal left inverted right x axis y axis)
HDMI-2 disconnected (normal left inverted right x axis y axis)
Output from ddcprobe:
vbe: VESA 3.0 detected.
oem: Intel(r)Cantiga Graphics Chip Accelerated VGA BIOS
vendor: Intel Corporation
product: Intel(r)Cantiga Graphics Controller Hardware Version 0.0
memory: 32704kb
mode: 1280x1024x256
mode: 1280x1024x64k
mode: 1280x1024x16m
mode: 1024x768x256
mode: 1024x768x64k
mode: 1024x768x16m
mode: 640x480x16m
mode: 800x600x64k
mode: 800x600x16m
mode: 640x480x256
mode: 800x600x256
mode: 640x480x64k
edid:
edid: 1 3
id: 4014
eisa: LEN4014
serial: 00000000
manufacture: 38 2008
input: analog signal.
screensize: 26 16
gamma: 2.200000
dpms: RGB, active off, suspend, standby
dtiming: 1440x...@50
dtiming: 1440x...@50
monitorid: LTD121EQ3B
Output from lspci -nn | grep VGA:
00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 4 Series
Chipset Integrated Graphics Controller [8086:2a42] (rev 07)
Content of /etc/X11/xorg.conf:
Section "Device"
Identifier "Configured Video Device"
EndSection
Section "Monitor"
Identifier "Configured Monitor"
EndSection
Section "Screen"
Identifier "Default Screen"
Monitor "Configured Monitor"
Device "Configured Video Device"
EndSection
--
screen resolution resets xubuntu 9.04
https://bugs.launchpad.net/bugs/380082
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