Re: Creator 3 D Framebuffer on Sun Ulta 1: XFree resolution and refresh rate settings

["David S. Miller" <davem@davemloft.net>]

You can't change the screen resolution and refresh rates after the
system has booted.  Neither the kernel nor Xfree86 know how to reprogram
the chip into a different resolution or refresh rate.

Instead, you have to much with the OpenPROM environment
variables and reset the machine.  For example, from the OBP prompt:

ok setenv output-device screen:r1280x1024x66

or whatever, on my large Sony flatpanel I use this:

ok setenv output-device screen:r1920x1200x70

You can find a list of usable resolutions and refresh rates from the
Sun Framebuffer document referenced earlier in this thread.