Xrandr not saving setting

Question

Hello xrandr at install doesnt detect my tv to be 1920x1080@60hz, so I have to add the setting manually and when I do that with xrandr it works this is the commands I used

xrandr --addmode HDMI-0 1920x1080
xranrd --output HDMI-0 --mode 1920x1080 --rate 60

When I do that the monitor works great and it's fine and all, problem is whenever I reboot, it goes back to 1360x768 and the mode that I added is not there anymore, I have to add it everytime, is there any ways to save the settings?

Also how can I set the size of dual monitors?

I am using fedora 15

Thanks

Answer 1

xrandr is a tool to modify your X session settings at runtime. The --addmode option is used to force the Xrandr extension to use an output mode that was not detected at Xorg startup (not save the mode in some configuration file).

It may be that you use xrandr --addmode HDMI-0 1920x1080 unnecessarily. The Xorg server might detect that mode, but not use it as the default one. To change this, you need to edit your Xorg configuration file: /etc/X11/xorg.conf (see man xorg.conf before you do). There, you can add an option

Option "PreferredMode" "your-mode-here"

to the Monitor section. To know what needs to be put in place of "your-mode-here", you can read /var/log/Xorg.0.log. Use less /var/log/Xorg.0.log, search (by pressing /) for a line containing 1920x1080 - it should read something like this:

 (II) fglrx(0): Modeline "1920x1080_60.0" 148.50  1920 2008 2052 2200  1080 1084 1089 1125 +hsync +vsync (67.5 kHz)

The part starting with Modeline and ending with vsync is what you need to copy (select text with mouse) and then paste to the xorg.conf under monitor section. Then the use name (1920x1080_60.0 in the above ModeLine) with "PreferredMode" option as descibed earlier. You can name it yourself in both places. The important part is that the ModeLine has to contain the technical information that Xorg has detected.