To change the display resolution or refresh rate on a SunBlade 100 or similar Sun hardware isn’t as easy as it sounds. Or at least it’s not obvious. These directions are for an M64 type graphics accelerator. The steps are similar for other Sun graphics accelerators, but the command will be different (maybe
ffbconfig). Check your hardware documentation for details.
These coommands should be run as root. I recommend running these commands via ssh from another system. If you accidentally change the resolution to something that is not supported you won’t be able to see so well to change it back.
To change video settings you’ll first want to find out what the card and display are capable of.
m64config -res ?
This will print the resolution and refresh rate options you have. Where three numbers are listed this represents the horizontal and vertical resolution and refresh rate respectively.
The current configuration will be shown with a
 next to it. Write down the current resolution and refresh rate. There are a lot to choose from and you’ll want to know you can get back to one that works.
Configurations marked with a
 are not supported by the video card and will probably not work.
To change the settings run this command with the desired resolution/refresh rate. The
now forces the system to change these settings immediately rather than at next refresh.
m64config -res 1024x768x75 now
Your monitor should click and flicker and with luck will then come back at the new resolution. If it doesn’t you can change it back to the old settings by running the
m64config command with the orignal settings. You did write the old setting down like I told you to right?