Desculpa repetir o e-mail, mas da última vez eu me enrolei com as respostas e acabei "esquecendo" do tópico (eu respondi, mas não para a lista).
O problema é o seguinte: Quando o GDM starta, ele abre em uma resolução diferente da configurada (1152x768 ao invés de 1024x768). (e como meu monitor não a aguenta, ele fica estranhamente reduzido no meio da tela) Daí eu logo normalmente e a tela volta à resolução normal. (ou fica na mesma resolução, e eu tenho que alterar pelo Sistema -> Preferências -> Resolução de tela e escolher o 1024x768). O conteúdo do xorg.conf é esse: # /etc/X11/xorg.conf (xorg X Window System server configuration file) # # This file was generated by dexconf, the Debian X Configuration tool, using # values from the debconf database. # # Edit this file with caution, and see the /etc/X11/xorg.conf manual page. # (Type "man /etc/X11/xorg.conf" at the shell prompt.) # # This file is automatically updated on xserver-xorg package upgrades *only* # if it has not been modified since the last upgrade of the xserver-xorg # package. # # If you have edited this file but would like it to be automatically updated # again, run the following command: # sudo dpkg-reconfigure -phigh xserver-xorg Section "Files" FontPath "/usr/share/fonts/X11/misc" FontPath "/usr/X11R6/lib/X11/fonts/misc" FontPath "/usr/share/fonts/X11/cyrillic" FontPath "/usr/X11R6/lib/X11/fonts/cyrillic" FontPath "/usr/share/fonts/X11/100dpi/:unscaled" FontPath "/usr/X11R6/lib/X11/fonts/100dpi/:unscaled" FontPath "/usr/share/fonts/X11/75dpi/:unscaled" FontPath "/usr/X11R6/lib/X11/fonts/75dpi/:unscaled" FontPath "/usr/share/fonts/X11/Type1" FontPath "/usr/X11R6/lib/X11/fonts/Type1" FontPath "/usr/share/fonts/X11/100dpi" FontPath "/usr/X11R6/lib/X11/fonts/100dpi" FontPath "/usr/share/fonts/X11/75dpi" FontPath "/usr/X11R6/lib/X11/fonts/75dpi" # path to defoma fonts FontPath "/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType" EndSection Section "Module" Load "i2c" Load "bitmap" Load "ddc" Load "dri" Load "extmod" Load "freetype" Load "glx" Load "int10" Load "vbe" EndSection Section "InputDevice" Identifier "Generic Keyboard" Driver "kbd" Option "CoreKeyboard" Option "XkbRules" "xorg" Option "XkbModel" "abnt2" Option "XkbLayout" "br" Option "XkbVariant" "abnt2" EndSection Section "InputDevice" Identifier "Configured Mouse" Driver "mouse" Option "CorePointer" Option "Device" "/dev/input/mice" Option "Protocol" "ImPS/2" Option "Emulate3Buttons" "true" EndSection Section "Device" Identifier "Intel Corporation 82945G/GZ Integrated Graphics Controller" Driver "i810" # Driver "intel" BusID "PCI:0:2:0" Option "IgnoreEDID" "true" EndSection Section "Monitor" Identifier "Monitor Genérico" Option "DPMS" HorizSync 28-102 VertRefresh 43-60 EndSection Section "Screen" Identifier "Default Screen" Device "Intel Corporation 82945G/GZ Integrated Graphics Controller" Monitor "Monitor Genérico" DefaultDepth 24 SubSection "Display" Depth 16 Modes "1024x768" EndSubSection SubSection "Display" Depth 24 Modes "1024x768" EndSubSection EndSection Section "ServerLayout" Identifier "Default Layout" Screen "Default Screen" InputDevice "Generic Keyboard" InputDevice "Configured Mouse" EndSection Section "DRI" Mode 0666 EndSection Obrigado, Rafael.