Same problem (video frequency too high between grub and gdm) after fresh Gutsy install with:
GC: ATI Radeon RV100 QY [Radeon 7000/VE] Samsung SyncMaster 570S (Flat 15'), DVI output, DVI to VGA adapter
The vga=791 trick doesn't help. In tty, the screen quality is very poor, trembling, partially blinking. No problem in graphical mode (from GDM on).
Same problem (video frequency too high between grub and gdm) after fresh Gutsy install with:
GC: ATI Radeon RV100 QY [Radeon 7000/VE]
Samsung SyncMaster 570S (Flat 15'), DVI output, DVI to VGA adapter
The vga=791 trick doesn't help.
In tty, the screen quality is very poor, trembling, partially blinking.
No problem in graphical mode (from GDM on).