Screen Resolution messed up

[S. Donig]

Hi 

as you haven't received any help so far I 'll try to help, though I am rather
no X-expert.  

> Hi all, I just rebooted just now, and my screen resolution is all messed
> up and too big.  
Are you using the fglrx-driver? If so, did you run fglrxconfig to create
a custom xorg.conf suited for the driver? If so, there might have been a
fault during that process. If you want to keep the driver and give it a
second try, you might just run it again.
> I tried to change it via the system and pref manager
> and got this error
> The X Server does not support the XRandR extension.  Runtime resolution
> changes to the display size are not available.
> I dont know what this means or why it did this. 
Well basically it's what it says: There's no support for dynamic
switching of the resolution implemented in the driver. Maybe there's a
way to circumvent that, but if so, I'm not aware of it.
>  The only thing that I
> have changed recently was I went from the standard video drivers on an
> ATI Radeon X300 to the binary ones from the Ubuntu web site
Yep. That's it.
> (btw how can I change back to the original ones?  
Normally it should be sufficient just to change the module you're
loading in xorg.conf back to (don'nt know what the x300 needs) "ati" or
whatever you had before. But you could also run 'dpkg-reconfigure
xserver-xorg' as your xorg.conf is messed up, as it seems.
> I am getting choppy video when I
> run things full screen, even though I thought that since my processor
> was fast enough to deal with it, 3 Ghz)  
I'm quite sure that not your CPU is to blame...