I've found that solution: I installed with the alternate cd just a basic system and could then boot to the console in recovery mode.(2nd option in grub). With "sudo apt-get install gnome-desktop" I installed manually the desktop package. During this installation, there appears a window, where you can select the resolution of the screen.
I start the desktop now with "gdm" from the root console in recovery mode, 1280x800er resolution, 24bit, vesa driver. Mpegs (youtube) playing fine. Only error after start is "cannot initialize HAL" and some of the system menues don't work (for ex. user and groups) This is my working xorg-conf: Section "Device" Identifier "Standardgrafikkarte" Driver "vesa" BusID "PCI:1:0:0" Option "ActiveDevice" "LCD,CRT" Option "NoDDCValue" "true" EndSection Section "Monitor" Identifier "Standardbildschirm" Option "DPMS" HorizSync 30-67 VertRefresh 30-60 EndSection Section "Screen" Identifier "Default Screen" Device "Standardgrafikkarte" Monitor "Standardbildschirm" DefaultDepth 24 SubSection "Display" Modes "1280x800" "1024x768" EndSubSection EndSection -- Ubuntu LiveCD doesn't start with a "VIA Chrome9 HC" graphic card and, when Ubuntu is installed, it works only with VESA drivers https://bugs.launchpad.net/bugs/179675 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs