Nouveau and refresh

I'm trying the nouveau driver with a dual-head setup on my GeForce 7800GS. I have an LCD and a CRT. The CRT is using a 60hz refresh, and I'd prefer a 75hz refresh rate.
I try:
xrandr --output VGA-1 -r 75
All that does is make the screen flickr one time and changes nothing.
Here is the full output from xrandr:
Screen 0: minimum 320 x 200, current 2560 x 1024, maximum 4096 x 4096
DVI-I-1 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 376mm x 301mm
1280x1024 60.0*+ 75.0
1280x960 60.0
1152x864 75.0
1024x768 75.1 70.1 60.0
832x624 74.6
800x600 72.2 75.0 60.3 56.2
640x480 72.8 75.0 66.7 60.0
720x400 70.1
VGA-1 connected 1280x1024+1280+0 (normal left inverted right x axis y axis) 356mm x 266mm
1280x1024 85.0 + 75.0 60.0*
1856x1392 60.0
1792x1344 65.0 60.0
1920x1200 59.9
1600x1200 75.0 70.0 65.0 60.0
1680x1050 84.9 74.9 60.0
1400x1050 85.0 74.9 60.0
1440x900 84.8 75.0 59.9
1280x960 85.0 60.0
1360x768 60.0
1280x800 84.9 74.9 59.8
1152x864 75.0
1280x768 84.8 74.9 59.9
1024x768 85.0 75.1 75.0 70.1 60.0 43.5 43.5
832x624 74.6
800x600 85.1 72.2 75.0 60.3 56.2
848x480 60.0
640x480 85.0 75.0 72.8 72.8 66.7 60.0 59.9
720x400 85.0 87.8 70.1
640x400 85.1
640x350 85.1
Here is my xorg.conf:
Section "Monitor"
Identifier "NEC"
EndSection
Section "Monitor"
Identifier "CRT"
Option "RightOf" "NEC"
EndSection
Section "Device"
Identifier "gf7800gs"
Driver "nouveau"
Option "Monitor-DVI-I-1" "NEC"
Option "Monitor-VGA-1" "CRT"
EndSection
Section "Screen"
Identifier "dual_head"
DefaultDepth 24
SubSection "Display"
Depth 24
Virtual 2560 1024
EndSubSection
Device "gf7800gs"
EndSection
Section "ServerLayout"
Identifier "layout1"
Screen "dual_head"
Option "AIGLX" "false"
EndSection
Last edited by reuben (2010-02-27 05:15:33)

I am doing my monthly check of "nouveau" threads in Arch
All arch nouveau users should just come to #nouveau on freenode, more chances to get a question answered there than here.
01:53 < chithead> you may need to specify a resolution too
01:54 < chithead> also for 1.2 it is --rate
You should have 1.3 though, so maybe try to specify a resolution ?
I never tried that myself, the correct refresh rate was always selected automatically.
Maybe kernel and Xorg logs could help too.

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