Corrigido após criar o arquivo /etc/X11/xorg.conf com o seguinte conteúdo:
Section "Monitor" Identifier "Monitor0" Modeline "1280x720_60.00"
74.50 1280 1344 1472 1664 720 723 728 748 -hsync +vsync
EndSection
Section "Screen"
Identifier "Screen0"
Device "Card0"
Monitor "Monitor0"
SubSection "Display"
Modes "1280x1024_60.00" "1024x768_60.00"
EndSubSection
EndSection
Section "Device"
Identifier "Card0"
Driver "i915"
EndSection