Lowering resolution on Dell E6510/Intel GM45HD

Not sure if this is the right forum... anyway, I seem to be unable to lower the resolution on my laptop screen from the default one of 1600x900 (I need to get it to 1024x768 to clone the output to a projector). Attaching an external monitor works fine, and I can choose between a range of resolutions for it. Some output from xrandr:
$ xrandr -q
Screen 0: minimum 320 x 200, current 1600 x 2100, maximum 8192 x 8192
eDP1 connected 1600x900+0+1200 (normal left inverted right x axis y axis) 344mm x 194mm
1600x900 60.0*+ 40.0
VGA1 connected 1600x1200+0+0 (normal left inverted right x axis y axis) 367mm x 275mm
1600x1200 60.0*+
1280x1024 75.0 60.0
1152x864 75.0
1024x768 75.1 60.0
800x600 75.0 60.3
640x480 75.0 60.0
720x400 70.1
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)
HDMI3 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)
As per Arch Wiki, I tried manually creating and adding the folowing mode:
$ cvt 1024 768 60 -r
# 1024x768 59.87 Hz (CVT 0.79M3-R) hsync: 47.30 kHz; pclk: 56.00 MHz
Modeline "1024x768R" 56.00 1024 1072 1104 1184 768 771 775 790 +hsync -vsync
However, if I try to set eDP1 to this mode, the screen just goes black. Switching to a console terminal works, and
I can kill the X server by a keyboard shortcut. However, the screen remains black even if I try to switch back to
the "default" mode by a shell script:
#!/bin/bash
xrandr --output eDP1 --mode 1024x768R
sleep 2
xrandr --output eDP1 --mode 1600x900
Any ideas?
Edit: forgot to repeat the info from the subject line: I'm running a Dell Latitude E6510 laptop, with integrated Intel GM45HD video.
Last edited by _oggy (2012-02-28 11:36:49)

Sorry guys, forgot to reboot my computer. *smacks head on wall twice*

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