[Hwupgr]

Dovresti edittare xorg.conf che è nella directory etc/X11/xorg.conf prova a modificare la voce VertRefresh (ad esempio 75.0 - 75.0) qui di seguito con un editor tipo nano (che è molto semplice oppure un altro che ti piace di più) oppure scrivi system-config-display (che fa partire la configurazione grafica, da notare che che gli esempi sotto sono con i driver Open Radeon che funzionano con schede Ati da 9500 in giù):


# Xorg configuration created by system-config-display

Section "ServerLayout"
Identifier "single head configuration"
Screen 0 "Screen0" 0 0
InputDevice "Keyboard0" "CoreKeyboard"
EndSection

Section "InputDevice"
Identifier "Keyboard0"
Driver "kbd"
Option "XkbModel" "pc105"
Option "XkbLayout" "it"
EndSection

Section "Monitor"

### Comment all HorizSync and VertSync values to use DDC:
### Comment all HorizSync and VertSync values to use DDC:
Identifier "Monitor0"
ModelName "Monitor0"
### Comment all HorizSync and VertSync values to use DDC:
HorizSync 30.0 - 86.0
VertRefresh 50.0 - 160.0
Option "dpms"
EndSection

Section "Device"
Identifier "Videocard0"
Driver "radeon"
EndSection

Section "Screen"
Identifier "Screen0"
Device "Videocard0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 16
Modes "1024x768" "800x600" "640x480"
EndSubSection
EndSection


Un'altro xorg.conf

# Xorg configuration created by system-config-display

Section "ServerLayout"
Identifier "Default Layout"
Screen 0 "Screen0" 0 0
InputDevice "Keyboard0" "Mouse0"
Option "AIGLX" "true"
EndSection

Section "Files"
EndSection

Section "Module"
Load "dbe"
Load "extmod"
Load "fbdevhw"
Load "glx"
Load "record"
Load "freetype"
Load "type1"
Load "synaptics"
Load "dri"
EndSection

Section "InputDevice"
Identifier "Keyboard0"
Driver "kbd"
Option "XkbModel" "pc105"
Option "XkbLayout" "it"
EndSection

Section "InputDevice"
Identifier "Mouse0"
Driver "mouse"
Option "CorePointer"
Option "Device" "/dev/input/mice"
Option "Protocol" "ExplorerPS/2"
Option "Emulate3Buttons" "false"
Option "Buttons" "5"
Option "ZAxisMapping" "4 5"
Option "ButtonMapping" "1 2 3 6 7"
Option "Resolution" "800"
EndSection

Section "Monitor"
Identifier "Monitor0"
HorizSync 31.5 - 67.0
VertRefresh 85.0 - 85.0
Option "VendorName" "Hanns/G"
Option "ModelName" "HC194D"
Option "DPMS" "true"
EndSection

Section "Device"
Identifier "radeonati"
Driver "radeon"
Option "DRI" "true"
Option "ColorTiling" "on"
Option "EnablePageFlip" "true"
Option "AccelMethod" "EXA"
Option "XAANoOffscreenPixmaps"
Option "RenderAccel" "true"
BusID "PCI:1:0:0"
EndSection

Section "Screen"
Identifier "Screen0"
Device "radeonati"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1280x1024"
EndSubSection
EndSection

Section "DRI"
Mode 0666
EndSection