fedora 15 - can't get 120Hz refresh rate with nouveau driver

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         hello everyone,


   i must miss something easy here...
fresh fedora 15 install: i can't get my monitor to switch to 120 Hz (it 
did with fedora 14 though).
the gnome "Displays" app (system settings) doesn't display  any refresh 
rate.

i tried some xrandr commands without success...

gtf 1920 1080 120.0
gives the corresponding modeline

xrandr --newmode "1920x1080_120.00"  368.76  1920 2072 2288 2656  1080 
1081 1084 1157  -HSync +Vsync
xrandr --addmode DVI-D-1 1920x1080_120.00
screen goes grey for half a second and returns to normal ; now there is 
a * next to the new mode

xrandr --output DVI-D-1 --mode 1920x1080_120.00
doesn't switch to 120Hz ; OSD effectively reports the refresh rate is 
still 60Hz

   the hardware is a lenovo t61p with docking station using dvi output.
   video card: nvidia quadro 570M.
   monitor: viewsonic v3d 241 wm led 120 hz.

   thanks for this very nice linux distribution by the way ! have a 
great day !


         pierre

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