A solução está no xorg.conf customizado para este netbook.
Section "InputDevice"
Identifier "Generic Keyboard"
Driver "kbd"
Option "XkbRules" "xorg"
Option "XkbModel" "abnt2"
Option "XkbLayout" "pt"
EndSection
Section "InputDevice"
Identifier "Configured Mouse"
Driver "mouse"
EndSection
Section "Device"
Identifier "Configured Video Device"
Boardname "vesa"
Busid "PCI:0:1:1"
Driver "geode"
Option "AccelMethod" "EXA"
Option "MigrationHeuristic" "greedy"
Option "PanelMode" "48960 1024 1064 1168 1312 600 601 604 622"
Screen 0
EndSection
Section "Monitor"
Identifier "Configured Monitor"
Vendorname "Generic LCD Display"
Modelname "LCD Panel 1024x600"
HorizSync 31.5 - 37.9
VertRefresh 50.0 - 70.0
DisplaySize 195 113
modeline "1024x600@60" 48.96 1024 1064 1168 1312 600 601 604 622 -HSync -VSync
Gamma 1.0
EndSection
Section "Screen"
Identifier "Default Screen"
Device "Configured Video Device"
Monitor "Configured Monitor"
Defaultdepth 24
SubSection "Display"
Depth 24
Virtual 1024 600
Modes "1024x600@60"
EndSubSection
EndSection
Section "ServerLayout"
Identifier "Default Layout"
screen 0 "Default Screen" 0 0
EndSection
Section "Module"
Load "glx"
Load "GLcore"
Load "v4l"
EndSection
Section "ServerFlags"
EndSection
Fonte: (
http://www.linuxmint.com.br/modules/newbb/viewtopic.php?start=20&topic_id=161&viewmode=flat&order=ASC&type=&mode=0) Post #22.