[vox-tech] using linux laptop with projector...

[Boris Jeremic]

Thanks all for hints!

Yes, I've found xrandr (KRandR is not on my machine, will need to 
upgrade KDE...).

While not perfect, xrandr works. I am puzzled as to why would not xrandr 
chagen the resolution as well. That is, on my laptop I get:


  SZ:    Pixels          Physical       Refresh
*0   1600 x 1200   ( 306mm x 231mm )  *70   65   60
  1   1400 x 1050   ( 306mm x 231mm )   74   70   59
  2   1280 x 1024   ( 306mm x 231mm )   75   60
  3   1280 x 960    ( 306mm x 231mm )   85   60
  4   1152 x 864    ( 306mm x 231mm )   85   75
  5   1024 x 768    ( 306mm x 231mm )   84   75   70   60
  6    800 x 600    ( 306mm x 231mm )   85   75   72   60
  7    640 x 480    ( 306mm x 231mm )   85   75   72   60
  8    832 x 624    ( 306mm x 231mm )   74
  9    720 x 400    ( 306mm x 231mm )   85
  10   640 x 400    ( 306mm x 231mm )   85
  11   640 x 350    ( 306mm x 231mm )   85
Current rotation - normal
Current reflection - none
Rotations possible - normal
Reflections possible - none


and then if I want to change it to say mode 6:

 >xrandr -s 6
 >xrandr -q
  SZ:    Pixels          Physical       Refresh
  0   1600 x 1200   ( 306mm x 231mm )   70   65   60
  1   1400 x 1050   ( 306mm x 231mm )   74   70   59
  2   1280 x 1024   ( 306mm x 231mm )   75   60
  3   1280 x 960    ( 306mm x 231mm )   85   60
  4   1152 x 864    ( 306mm x 231mm )   85   75
  5   1024 x 768    ( 306mm x 231mm )   84   75   70   60
*6    800 x 600    ( 306mm x 231mm )  *85   75   72   60
  7    640 x 480    ( 306mm x 231mm )   85   75   72   60
  8    832 x 624    ( 306mm x 231mm )   74
  9    720 x 400    ( 306mm x 231mm )   85
  10   640 x 400    ( 306mm x 231mm )   85
  11   640 x 350    ( 306mm x 231mm )   85
Current rotation - normal
Current reflection - none
Rotations possible - normal
Reflections possible - none


adn then back to normal mode.

What is happening is that the area of screen shrinks, while preserving 
the upper left corner (which is good so I can have a small xterm there 
and just fire up the acroread for presentation. The good thing is that 
full screen mode now uderstand this new full screen and only uses 
available (in previous example case 800x600) area for PDF...

So it is really not change in resolution (resolution of screen remains 
the same, the only change is in the area shown on LCD...).

I am not sure what I used to have on my old laptop (it got stollen), not 
even sure if it was redhat or suse, but CTRL-ALT + or - used to change 
the resolution of the LCD screen while stretzhing the desktop to full 
screen... Much like what one can do with Windows... Not that I care much 
about it, it'll only be used for presentations.


Boris



Matt Roper wrote:
> On Sat, Aug 13, 2005 at 04:24:41PM -0700, Boris Jeremic wrote:
> 
>>Hello There,
>>
>>I want to use my laptop (RedHat 9) when I make presentations. I used to 
>>be able (with old laptop) to change screen resolution from (current 
>>1600x1200) to whatever will the (outside) projector accept (usually 
>>800x600 or so...) It used to work (again on old laptop) with CRTL-ALT + 
>>or - and the resolution would change.
>>
>>When I use CRTL-ALT + or - now, the actual area of screen changes and 
>>thus I loose part of screen (it shrinks toward middle part of screen so 
>>that for example 800x600 is middle quarter of screen only). The big part 
>>of X window is lost (top menu bar...) and so I cannot use it to show PDF 
>>presentations, but have to (Yack) reboot to windows and show PDF there 
>>(I use LaTeX, and foils, slides or beamer classes to make those PDFs...).
>>
>>Any suggestion on what to do to get this change in resolution, while 
>>maintaining the screen size (and coverage) would be appreciated.
>>
> 
> 
> Hi Boris.  I think the tool you're looking for is xrandr.  For example,
> on my machine, I can get a list of possible resolutions as follows:
> 
>     mattrope at hades:~$ xrandr
>      SZ:    Pixels          Physical       Refresh
>     *0   1280 x 1024   ( 342mm x 271mm )  *75   60  
>      1   1280 x 960    ( 342mm x 271mm )   60  
>      2   1024 x 768    ( 342mm x 271mm )   75   70   60  
>      3    800 x 600    ( 342mm x 271mm )   75   72   60   56  
>      4   1280 x 800    ( 342mm x 271mm )   60  
>      5   1152 x 864    ( 342mm x 271mm )   75  
>      6   1280 x 768    ( 342mm x 271mm )   60  
>      7    832 x 624    ( 342mm x 271mm )   75  
>      8    640 x 512    ( 342mm x 271mm )   75   60  
>      9    720 x 450    ( 342mm x 271mm )   60  
>      10   640 x 480    ( 342mm x 271mm )   75   73   60  
>      11   640 x 400    ( 342mm x 271mm )   60  
>      12   576 x 432    ( 342mm x 271mm )   75  
>      13   640 x 384    ( 342mm x 271mm )   60  
>      14   512 x 384    ( 342mm x 271mm )   75   70   60  
>      15   416 x 312    ( 342mm x 271mm )   75  
>      16   400 x 300    ( 342mm x 271mm )   75   72   60   56  
>      17   320 x 240    ( 342mm x 271mm )   75   73   60  
>     Current rotation - normal
>     Current reflection - none
>     Rotations possible - normal 
>     Reflections possible - none
> 
> and then choose a different resolution by running:
> 
>     mattrope at hades:~$ xrandr -s 800x600
> 
> The xrandr command makes use of the "rotate and resize" (i.e. RandR)
> extension of X which is relatively new (so I'm not sure whether your
> Redhat 9 system will have it without additional upgrades).
> 
> A fairly good introduction to xrandr can be found here:
>     http://www.debian-administration.org/articles/201
> 
> Hope that helps.
> 
> 
> Matt
>