I set the resolution wrong and can't see anything

lightnb · #1 17th July 2006, 05:34 PM

I set my resolution to 1200x1600 (which my monitor can support), but the refresh rate is 75 Hz and it should be 60 Hz.

When the x-server starts I get a "frequency out of range" error on the monitor.

I either need to boot into 'safe mode' (provided Linux has something like that?), or find someway to set the frequency to 60 Hz.

Does anyone know how to do this?

Thanks,

Nick

PlateSpinner · #2 17th July 2006, 06:16 PM

Quote:

Does anyone know how to do this?

Well you don't even have to reboot. While you're looking at the error message, you can look at another virtual console by hitting Ctrl+Alt+[LeftArrow] (or right arrow). See this RedHat KB article for more info.

That will bring you to a text console. Log in there and then enter in the following command to reset the display settings:

Code:

system-config-display --reconfig

Hope that helps...

-PlateSpinner

lightnb · #3 17th July 2006, 06:47 PM

Thanks

I got it reset.

How do I set the resolution and refresh rates at the same time?

I can use the monitor configuration tool to set the resolution, but that requires x to be restarted before the screen resolution tool gives the option for 1600 x 1200, at which point you can't see anything anyway.

Is there a command line way of setting the resolution and refresh rate? It needs to be 1200 x 1600 at 60 Hz, and it keeps trying to make it 1200 x 1600 at 75 Hz.

Thanks again,

Nick

***bob*** · #4 17th July 2006, 07:59 PM

You might try to make adjustments in /etc/X11/xorg.conf - try limiting the upper end of the VertRefresh.

PlateSpinner · #5 17th July 2006, 08:02 PM

Quote:

Is there a command line way of setting the resolution and refresh rate? It needs to be 1200 x 1600 at 60 Hz, and it keeps trying to make it 1200 x 1600 at 75 Hz.

Most any shell command can be investigated these two ways:

1. For the long story about a command, type this to see the manual entry

Code:

man command

2. For the "Cliff Notes" short-version of what a command does, try this

Code:

command --help

So after taking a look at the '--help' entry for system-config-display, I would say the command you want is this

Code:

system-config-display --set-resolution=1200x1600 --set-vsync=60

lightnb · #6 18th July 2006, 04:38 AM

Thanks you

got it working.