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[Bug 732050] Re: Dual display blanks both screens . Can only see the cursor

To: compiz@xxxxxxxxxxxxxxxxxxx
From: david <732050@xxxxxxxxxxxxxxxxxx>
Date: Sat, 30 Apr 2011 02:18:17 -0000
Reply-to: Bug 732050 <732050@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

Same here. 11.04 AMD64, Thinkpad X201T + Dell 24" LCD connected to the x200 ultrabase.
No problem at GDM but 

in Ubuntu/Ubuntu classic mode
1) Only see a spinning cursor on both screens after login ( if both screens are turn on)
2) Only see a spinning cursor on laptop's screen ( if external monitor is turn off)

in Ubuntu classic no-effects mode
1) Both screens go black ( if both screens are turn on)
2) laptop's LCD display correctly ( if external monitor is turn off)

Fn + F7 has no effects on me.

xrandr -q can detect my DP1 is connecting to the external display, but

xrandr --output DP1 --mode 1920x1200 --preferred --primary --output
LVDS1 --off --output HDM1 --off

is not working.

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https://bugs.launchpad.net/bugs/732050

Title:
  Dual display blanks both screens . Can only see the cursor