[ltp] Internal/external display use

[Friedemann Baitinger]

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On Fri, 5 May 2000, Markus Alt wrote:


> Hey, looks like this really makes it! The point is that the entries
> within the "Modes" line must have *different names* so you're able to
> switch between them. I've set the "HorizSync" and "VertRefresh" ranges
> to the values of the external monitor (which include the range of the
> LCD), otherwise it won't work. So parts of my XF86config now look like
> 
>   HorizSync	30-97
>   VertRefresh	50-144
>   Modeline "1600x1000" 102.96 1600 1616 1968 2080 1000 1000 1007 1044
>   Modeline "1280x960" 83.20 1280 1296 1552 1664 960 960 967 1003
>   Modeline "1024x768" 66.00 1024 1040 1216 1328 768 768 775 802
>   Modeline "1024x768ext" 102.92 1024 1088 1264 1352 768 768 780 794
> 
> and
> 
>   SubSection "Display"
>     Depth	24
>     Modes	"1024x768ext" "1024x768"
> 
> It looks like the order of the "Modes" line above is important. If I
> specify "1024x768" (for LCD) first and switch to external only with
> Fn-F7, I'm not able to select the "1024x768ext" resolution for the
> external display with Ctrl-Alt-NumPad+ or Ctrl-Alt-NumPad-. And I want
> to have only the external running when working at the office, because I
> don't know whether it causes harm to the LCD if it receives the higher
> rez signal of the external (which it can't display anyway) when both
> displays are active. Just being a bit paranoid ... ;-)
> 
> So with the configuration above, I get what I want, apart from one
> drawback: When booting (default runlevel 3) without external display or
> just LCD selected, no KDE login manager is displayed at the end of the
> boot process, as the first specified rez doesn't work with the LCD. No
> problem - toggle to the other rez with Ctrl-Alt-NumPad+ or
> Ctrl-Alt-NumPad-. This is ok with my external keyboard, but ummh ... I
> never made it to get that @#*! NumLock key working on my TP's keyboard.
> No problem so far, but now I'd have a little problem selecting the
> correct rez when I'm w/o external keyboard, e.g. at home. Not a very
> nice idea ...
> 
> So could any kind soul share his/her Xmodmap with me in order to help me
> out of that mess? Thanks in advance!
> 
> Oh, and I forgot: The font on my virtual consoles (Ctrl-Alt-F1 to F6)
> look a little strange since the change in the XF86config. But that's
> secondary and maybe I find a way to get the old ones back a fiddling a
> bit with the other resolutions.

Assuming you are running xdm, why don't you just configure 2 local
displays? I had this configured years ago to be able to run 16-bit color
mode on ctrl-alt-f7 and a 32-bit color mode on ctrl-alt-f8. I have tried
the same to run a display in 75 dpi mode and another one at the same
time in 100dpi mode.

If you are running RedHat, just edit: /etc/X11/xdm/Xservers and you'll
find a line like:

:0 local /usr/X11R6/bin/X

Change that to something like (add your paramters as you like):

:0 local /usr/X11R6/bin/X -dpi 75 vt07
:1 local /usr/X11R6/bin/X -dpi 100 -bpp 32 vt08

unfortunately I don't recall the details currently how to point to
different XF86config files.

- -- 
Friedemann Baitinger       fb@baiti.net      http://baiti.net/fb

If we don't succeed, we run the risk of failure
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