F18 - dual screen problem

Laing, Robin Robin.Laing at drdc-rddc.gc.ca
Fri Apr 26 18:04:53 UTC 2013


After an update, my dual display started having problems and I don't 
know where to look.

A clean install of Fedora using KDE spin worked wonderfully with this 
setup.  On one upgrade, the Fedora boot process is mirrored on both 
displays and stays mirrored after X starts which is configured as side 
by side.

When I do a power on boot, the bios display is only on Display 1.  Once 
Fedora picks the kernel, the display changes to mirrored and any 
comments or splash screens are the same on both screens.

If I use CTRL+ALT+F3 for example, the terminal is mirrored to both displays.

Screen saver password request box comes up on both screens but the data 
only goes in on one screen.  I can use either box to enter the password.

X runs slower under this configuration as I think it competes for 
control and if I try to run some applications (games) the display really 
gets screwed up if they require full screen, such as Tuxracer.  This 
will be displayed on both screens in a mirrored mode and then won't go 
back to side by side until I reset the configuration.

I have tried to search through the grub2 settings to find where the 
screen resolution is set but have not succeeded in configuring this.

I am using Nvidia video card with the Nouveau driver.

Is adding the following to the /etc/default/grub the correct way to fix 
problems?

GRUB_GFXMODE=3840x1080x32
GRUB_GFXPAYLOAD_LINUX=keep







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