[ltp] x41 monitor selection (was Re: x31 vs x41 )

[Jaime Davila]

Paul Fox wrote:
> i (paul) wrote:
>  > 
>  > finally had a chance to try this.  using the video_switch command
>  > to that proc node has the same effect as using the fn-key:  the
>  > lcd by itself works fine, and the monitor by itself works fine, but
>  > both together does not work.  when they're both enabled together,
>  > i get "Input not supported" on the monitor.  (i'd forgotten this
>  > symptom when i wrote the other day.)  the monitor is a 1280x1024
>  > 19" LCD.  i've never asked it, via X, to do anything but match the
>  > laptop's 1024x768, however, and that's the dimension that displays
>  > correctly when i select just the monitor.
> 
> someone asked the other day whether the symptoms were the same when
> either on or off the dock -- they are.
> 
>  > i suspect my X configuration is incorrect, but i confess, i'm not
>  > sure how to go about fixing it.  like i said, i'm perfectly happy
>  > using just 1024x768 externally, to match the internal display dimensions.
>  > i don't run on the external display often enough to want to deal
>  > with changing desktop sizes, etc.  (unless someone has a recipe to
>  > make that _totally_ painless.  :-)
> 
> i should also add that i'd probably be okay with the current behavior,
> since i don't really care if both displays work at the same time,
> except that a) someday i might care, and b) once in a while the
> external video doesn't work at all -- not even when the lcd isn't
> on.  i believe i get the "Input not supported" thing then, too.
> 
> any tips on how to get my X11 config correct would be much appreciated.
> 
> paul
> =---------------------
>  paul fox, pgf@foxharp.boston.ma.us (arlington, ma, where it's 2.1 degrees)


I'm not sure if it is related to what you see, but I also have _some_ 
problems when trying to use both the lcd and the external monitor at the 
same time. In my case, I get something on both, but the image on the 
external monitor wiggles like crazy, making it painful to look at. I've 
searched for a while for a fix, and have only found one. When I want to 
use both devices at the same time (for example, if the external monitor 
is actually a projector, I'm giving a presentation and don't want to 
have to be looking at the projected image), I use a program called 
i855crt. If you install it, typing i855crt on the command line will tell 
you more about options.

/etc/i855crt.conf will also have useful information.

Hope that helps,

Jaime


-- 

******************************************************
Jaime J. Davila
Associate Professor of Computer Science
Hampshire College
School of Cognitive Science
jdavila at hampshire dot edu
http://helios.hampshire.edu/jdavila
*******************************************************