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Dual head second monitor resolution problem ATI Radeon Mobility 7500 Redhat 9
I am using a ATI radeon Mobility 7500 video card with redhat 9 and after trying for quite a long time I finally got the dual head to work on my video card. However now I have another problem. I cant get the resolution of the second display to be anything other than 640x480. I know that my video card supports higher resolution on the second display because I can go much higher when using windows. Any help would be greatly appreciated. Here is my XF86Config File.
Thanks For the help.
------------------------------------------XF86 Config File -------------------------------------------------------
# XFree86 4 configuration created by redhat-config-xfree86
I have been having the exact same problem, with the exception that I am trying to get the two screens to be clones. The cloning part works, but the CRT is always 640x480.
I was able to get the CRT to use a sane resolution and refresh rate, but only at the expense of the LCD, which isn't practical because it does this even when the laptop (Dell D600) is undocked.
I was eventually able to get the screen cloned as demonstrated in the earlier post (using the Clone* options). However, the two displays must have the same vertical refresh rate. Since the LCD does 60Hz, that's painful on the CRT.
The final solution was to create two XF86Config files: one for docked (CRT) and one for undocked (LCD). They have all of the same settings w.r.t. resolution and color depth, but the CRT uses the external monitor port and a 74Hz refresh rate whereas the undocked config uses the LCD at 60Hz.
There are three files: XF86Config.P780 (docked), XF86Config.LCD (undocked), and XF86Config (NOT a symlink!). At boot time, I do (in Perl):
$returncode = system("/bin/grep 'Vendor=413c' /proc/bus/usb/devices");
$returncode /= 256;
if ( $returncode eq '0' ) {
# This is the "match" case.
print "Docked.\n";
print "Updating config for dock...\n";
system "/bin/cp -f /etc/X11/XF86Config.P780 /etc/X11/XF86Config";
}
if ( $returncode eq '1' ) {
# This is the "no match" case.
print "Not docked.\n";
print "Updating config for no dock...\n";
system "/bin/cp -f /etc/X11/XF86Config.LCD /etc/X11/XF86Config";
}
if ( $returncode eq '2' ) {
# This is the "error" case.
print "Got some error.\n";
print "Updating config for no dock...\n";
system "/bin/cp -f /etc/X11/XF86Config.LCD /etc/X11/XF86Config";
}
The "Vendor=413c" thing is to detect the USB controller that is present in the dock, found in /proc/bus/usb/devices. It's absent when undocked (obviously). By testing the return codes from grep (see method above), I can tell whether I'm docked or not.
And that was the eventual solution for dealing with the dock *AND* getting a decent refresh rate on the CRT. Not perfect, but still within un-hack-ish limits.
I am able to do different refresh rates with the same XF86Config.
There are some caveats though - if I start the X server with the laptop undocked, then upon docking, the monitor runs at 60Hz. However, if I start the X server when docked, I am able to get 75Hz on the monitor. The LCD keeps running at 60Hz I think. The corresponding config file looks like this:
# /.../
# SaX generated XFree86 config file
# Created on: 2004-08-09T10:01:16+0530.
#
# Version: 4.8
# Contact: Marcus Schaefer <sax@suse.de>, 2002
#
# Automatically generated by [ISaX] (4.8)
# PLEASE DO NOT EDIT THIS FILE!
#
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