notebook / multiple visual displays - activation and control

[Tom London]

On Mon, Mar 31, 2008 at 9:26 AM, Jesse Barnes <jbarnes at virtuousgeek.org> wrote:
> On Saturday, March 29, 2008 2:39 am Alex Lancaster wrote:
>  > Heh, I actually went through an almost identical scenario you just
>  > painted today.  I've found that with F-8, the only way to make sure
>  > that the output VGA is sent with the correct resolution, is to reboot
>  > the computer with the projector/external monitor plugged.  In
>  > addition, this also presupposes that I've manually tweaked my
>  > xorg.conf to specifically ask for this setup beforehead.  My laptop is
>  > 1280x800 but most video projectors only accept 1024x768 VGA input.
>
>  That's weird, when you run 'xrandr' it should re-probe the outputs and get a
>  list of valid resolutions from whatever is attached to VGA.  What happens for
>  you in that case?
>
>  Jesse
>
xrandr probing sometimes appears to "not work right", at least for me.

I have a Thinkpad X60 with intel 945 graphics, 1024x768 LCD.  When
booting with just the builtin monitor, all works fine.

When booting with 2 different 19" monitors and with the laptop screen
"shut", X/gdm boots up in a funny hybrid mode, where the interface is
actually in 1280x1024 (max supported by interface and monitors), but X
thinks its in 1920x1080 or 1920x1024.  I have to manually enter
"xrandr --size 1280x1024" each login to get system configured right.

Here is output of xrandr with non-functioning modes, but after running
"xrandr --size 1280x1024".

[tbl at localhost ~]$ xrandr
Screen 0: minimum 320 x 200, current 1280 x 1024, maximum 1920 x 1920
VGA connected 1280x1024+0+0 (normal left inverted right x axis y axis)
376mm x 301mm
   1280x1024      60.0 +   75.0*    60.0     60.0
   1920x1080      59.9
   1680x1050      59.9
   1600x1024      60.2
   1400x1050      60.0
   1440x900       59.9
   1280x960       60.0
   1360x768       59.8     60.0
   1280x800       75.0     70.0     60.0
   1152x864       75.0     75.0     70.0     60.0
   1280x768       75.0     70.0     60.0
   1280x720       75.0     70.0     60.0
   1152x768       54.8
   1024x768       75.1     75.0     70.1     60.0
   832x624        74.6
   800x600        72.2     75.0     60.3     56.2
   640x480        75.0     72.8     72.8     75.0     60.0     59.9
   720x400        70.1
LVDS connected (normal left inverted right x axis y axis)
   1024x768       50.0 +   60.0     40.0
   800x600        60.3
   640x480        60.0     59.9
[tbl at localhost ~]$


tom
-- 
Tom London