change CRT resolution Post: 29462

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Special Forums UNIX Desktop Questions & Answers change CRT resolution Post 29462 by RTM on Monday 7th of October 2002 10:10:59 AM

10-07-2002

Registered User

Found on Sunsolve (realize things like Stop-a may crash your server):

Here are the steps to set up several (TurboGX) tgx cards.

(This may make assumptions about the OpenBoot[TM] prom rev level
and the resolutions the frame buffer supports.)

1) The console monitor is set up using output-device

User can find which device is the console monitor with:

L1-A (Stop-a)
ok devalias screen

It should say something like /sbus@1,f8000000/cgsix@3,0 this is
the console screen. This string will differ on other types of
hardware. For instance, it may be /obio/cgfourteen@2,0 on a
sparc-20.

Next, look at all the frame buffers on the system:

ok show-devs
... /cgsix@0,0
... /cgsix@2,0
... /cgsix@3,0

It has already been seen which device was the console frame buffer.
The other two frame buffers are cgsix@2 and cgsix@3. This output
will widely vary depending on the system architecture.

Now, set up a shell script:

#!/bin/sh
eeprom output-device='screen:r1280x1024x76'
eeprom fcode-debug\?=true
eeprom nvramrc='probe-sbus
" /iommu/sbus/cgsix@2" select-d ev
r1280x1024x76
" /iommu/sbus/cgsix@2" " set-resolution" execute-device-method drop
device-end
" /iommu/sbus/cgsix@3" select-dev
r1280x1024x76
" /iommu/sbus/cgsix@3" " set-resolution" execute-device-method drop
device-end
install-console
banner
'
eepr om use-nvramrc\?=true

Pay attention to the spaces within the double-quotes.

The output-device line sets the resolution for the console, which
is the primary frame buffer.

The nvramrc line sets up code that executes each time the system
boots. This program sets up the resolution on the second and
third tgx devices.

The last line says to use the script in nvramrc when booting.

Notes:

To find built-in resolutions available for some of the newer frame
buffers (this doesn't work for all devices), type:

L1-A
ok show-devices
...
/sbus@1,f8000000/cgsix@3,0 <-- this is the frame buffer
...
ok cd /sbus/cgsix@3,0
ok words

The resolutions supported show up like r1280x1024x76 (or hdtv).

Other references:
Open Boot Command Reference

Writing Fcode Programs

RTM

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get_desktop_resolution

get_desktop_resolution(3alleg4) 				  Allegro manual				   get_desktop_resolution(3alleg4)

NAME

       get_desktop_resolution - Finds out the desktop resolution. Allegro game programming library.

SYNOPSIS

       #include <allegro.h>

       int get_desktop_resolution(int *width, int *height);

DESCRIPTION

       Finds out the currently selected desktop resolution. You can use this information to avoid creating windows bigger than the current resolu-
       tion.  This is especially important for some windowed drivers which are unable to create windows bigger than the desktop. Each parameter is
       a pointer to an integer where one dimension of the screen will be stored.

       Under  some  OSes,  switching  to a full screen graphics mode may automatically change the desktop resolution. You have, therefore, to call
       this function before setting any graphics mode in order to retrieve the real desktop resolution. Example:

	  int width, height;

	  allegro_init();
	  ...
	  if (get_desktop_resolution(&width, &height) == 0) {
	     /* Got the resolution correctly */
	  }

RETURN VALUE

       Returns zero on success, or a negative number if this information is not available or does not apply, in which case the	values	stored	in
       the variables you provided for `width' and `height' are undefined.

SEE ALSO

       desktop_color_depth(3alleg4), set_gfx_mode(3alleg4)

Allegro 							   version 4.4.2				   get_desktop_resolution(3alleg4)