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tim914 06-02-2008 06:10 PM

GDM Resolution stuck in F9
Hi Gang,

After installing F9, I am running X at 1440x900. My /etc/X11/xorg.conf has exactly one entry for 24 bit color depth - "1440x900". However, when I restart the system or logout, the GDM session resets to 800x600 mode and the display goes a bit odd (refresh rate I suspect).

Since GDM and X are supposedly sharing the xorg.conf file, how could gdm be getting an 800x600 setting since there isn't one in my xorg.conf?

BTW - if I reinstall my F7 disk, both are displaying at 1440x900.


corgi 06-03-2008 01:17 PM

I don't use the same distro as you (I've got Debian) but your issue has something in common with one of mine, so I'll dexcribe it in case it might help point you in the right direction.

After upgrading by changing from the 'i810' graphics driver to the 'intel' driver, which works with the xrandr ('X Rotate AND Resize) utility, the following has happened:

When using an external LCD display with my laptop I initially achieved the max resolution of the external display (i.e. 1680x1050). However, suddenly now Gnome starts every time with a lower resolution 1250xsomething.

When I issue the command:


it reports 1680x1050 as the next available resolution above the active one. I can switch to it without any trouble by issuing:

$xrandr -s 1680x1050

However, I have not found out what the source of the problem is. Changing xorg.conf to specify only the wanted resolution does not solve the problem. Pretty annoying!

I am guessing there must be some other file in addition to xorg.conf that stores information that is used when starting the GUI.

Maybe you could check documentation on the exact order of processes and config files that are invoked when starting the GUI with your distribution?

Good luck!

tim914 06-03-2008 01:54 PM

Thanks, Ari,

I've been all over this and the GDM docs state multiple times that GDM reads it's settings from the xorg.conf.

For project, I clobbered my xorg.conf file and relaunched. Low and behold GDM appeared... So, there's obviously something else involved, but nothing that the GDM docs or code has revealed.


corgi 06-04-2008 01:13 AM

I don't know if this helps, but this morning I solved my problem. I noticed something I hadn't noticed earlier:

When I got the login manager my display was actually in 1680x1050 resolution. After logging in, however, it changed to 1280x1024.

When I noticed this I chose 'Desktop' -> 'Preferences' -> 'Screen resolution' in Gnome. Here I switched to 1680x1050.

I logged out and in again, and now Gnome starts in my preferred resolution!

I suppose this means there is an configuration entry that can also be reached through the Gnome Configuration Editor that takes care of the issue.

tim914 06-04-2008 09:21 AM

For me, the changes in the Display Resolution and Screen Size settings aren't helping.

My issue is with the GDM login screen. My normal X session starts up correctly at 1440x900, but the GDM session insists on 800x600 and it gives my monitor fits...


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