Invalid resolution when using CTRL/ALT/F1 - how to fix (ubuntu 8.10)

Brian McKee brian.mckee at
Thu Nov 27 14:11:11 UTC 2008

On Thu, Nov 27, 2008 at 5:57 AM, Chris G <cl at> wrote:
> I'm running xubuntu 8.10 (though I suspect the problem is common to
> all 8.10 versions).
> I can run X fairly reliably though I do have some issues when logging
> in and out presumably due to switching resolutions.
> However switching to a console using CTRL/ALT/F1 (or any of the
> others) doesn't work.  I just get an error message from my monitor
> saying the resolution is invalid.  My monitor is a Dell 2001FP capable
> of up to 1600x1200 so I suspect that the CTRL/ALT/F1 is switching to a
> totally impossible resolution.
> How can I fix this problem?  Is there any way to specify the mode and
> resolution to use for the text mode consoles?

The consoles resolution is controlled by the VGA= line in /boot/grub/menu.1st

See the tables down the page at to get a list of
values you can pass in, or set it to vga=ask to experiment



PS - your log-in/log-out thing is probably related since X restarts
when you log out and you should see the text consoles very briefly

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