Grub vga value for LCD monitor

Does anyone know the best value of the vga parameter in grub for an LCD monitor? I've tried the value of 0x031a (1280x1024, 16 bits), but it causes the monitor to produce an "out of range" message on the screen. My guess is that the same value will work for all LCD monitors. I can get it to work with "vga=normal" but I would like to get higher resolution, particularly when I'm working with text consoles. I discovered by looking in the code for /sbin/mkinitrd that you can get a list of available values with the command "/usr/sbin/hwinfo --framebuffer", but seeing the available values doesn't tell you which ones will work, particularly since the values are given with bit counts, not scan frequencies. Paul