Public bug reported:
Hi guys,
A typical busy day at work requires me to connect my laptop and switch
between various external displays (projector, monitor, video conf
equipment) about 20 times a day, all while going through sleep/resume
cycles inbetween.. (I hope you do test against these use cases?)
Hardware: Lenovo X200, built-in Intel X4500 graphics
Karmic (9.10) Ubuntu/Xubuntu
I booted my Lenovo X200 on an official Ubuntu live disk,
connected first to my desk monitor via VGA plug, ran 'xrandr' just by itself
and get the full capabilities of my monitor as expected. I can successfully use
xrandr to get my desktop extended over both monitors.
I then use "xrandr --output VGA1 --off" to turn off the external monitor before
unplugging it.
So far so good. But as soon as I try to connect to the VGA plug of a projector
or any other monitor and run 'xrandr' again, it reports resolutions from the
previous monitor and not the current one. As a result xrandr doesn't let me
display anything on that new monitor.
When I connect my laptop to the 2nd monitor or projector first, xrandr works on
that monitor nicely. But then it doesn't work anymore with my desk monitor.
It is as if xrandr is only working the very first time after boot-up.
I also did this other test of using xrandr to turn on and off the same external
monitor repeatedly.
It seems that that confuses xrandr massively after the 2nd or 3rd time. Xrandr
is unexpectedly turning off all monitors or showing big black areas on the
desktop etc.. Despite the mess happening on my monitors, xrandr keep reporting
capabilities from the very first external monitor only:
$ xrandr
Screen 0: minimum 320 x 200, current 3200 x 1200, maximum 8192 x 8192
VGA1 connected 1920x1200+0+0 (normal left inverted right x axis y axis) 519mm x
324mm
1920x1200 60.0*+
1280x1024 75.0
1024x768 75.1 60.0
800x600 75.0 60.3
640x480 75.0 60.0
720x400 70.1
LVDS1 connected 1280x800+1920+0 (normal left inverted right x axis y axis)
261mm x 163mm
1280x800 60.0*+ 50.0
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
HDMI1 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
DP3 disconnected (normal left inverted right x axis y axis
I have attached my Xorg.0.log
It should show this sequence of activities:
- booted up without any external monitors connected
- then I connected to "Manufacturer: DEL Model: a016 Serial#: 808604243"
- disconnected from that and
- connected to a video conference device (which Xorg.0.log wrongly lists as
"Manufacturer: DEL Model: a016 Serial#: 808604243")
- ran xrandr to activate VGA1 (unsuccessfully)
- disconnected from video conference device
- reconnected to desk monitor "DEL Model: a016 Serial#: 808604243"
** Affects: libxrandr (Ubuntu)
Importance: Undecided
Status: New
--
Karmic's xrandr doesn't update when connected to different external monitor
https://bugs.launchpad.net/bugs/495063
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