Display problems-How to set up a certain resolution & frequency?

wladimir-blumenkohl · 12-12-2006, 11:29 AM

Hi,

after installing the new ATI drivers I've problems with my display. I'm using Fedora Core 6. My display is a CRT-Monitor by Videoseven (N110S)http://www.videoseven.de/mediadata/i...0S_english.pdf

I'm using KDE 3.5.5 The programs with graphical interface witch are installed on KDE don't work properly. I can select resolution and frequency but not all possible resolutions and frequencies are listed, dispite of the fact that they are written to my /etc/X11/xorg.conf But even if I choose a listed resolution and frequency only the resolution is beeing changed and the frequency isn't.

Does anyone have some further ideas how I could solve this problems? I'd like to have the resolution "1280x960" and a freqency of "100Hz". Also possible would be "1152x864" with "100Hz".

I read in some other threads and forums that I've to set up my /etc/X11/xorg.conf Are there some entries missing or wrong?

My xorg.conf looks like this:

# Xorg configuration created by system-config-display

Section "ServerLayout"
Identifier "single head configuration"
Screen 0 "aticonfig-Screen[0]" 0 0
InputDevice "Keyboard0" "CoreKeyboard"
EndSection

Section "Files"
EndSection

Section "Module"
Load "bitmap"
Load "dbe"
Load "ddc"
Load "dri"
Load "extmod"
Load "fbdevhw"
Load "freetype"
Load "GLcore"
Load "glx"
Load "int10"
Load "record"
Load "type1"
Load "vbe"
# Load "v4l"
EndSection

Section "ServerFlags"

# not supported by ATI proprietary driver
Option "AIGLX" "false"
EndSection

Section "InputDevice"
Identifier "Keyboard0"
Driver "kbd"
Option "XkbModel" "pc105"
Option "XkbLayout" "de"
EndSection

Section "InputDevice"
Identifier "Mouse0"
Driver "mouse"
Option "Device" "/dev/input/mice"
Option "Buttons" "10"
Option "ZAxisMapping" "4 5"
Option "Emulate3Buttons" "false"
Option "ButtonMapping" "1 2 3 6 7 8 9 10 4 5"
EndSection

Section "Monitor"
Identifier "aticonfig-Monitor[0]"
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
HorizSync 30-110
VertRefresh 50-160
EndSection

Section "Device"
Identifier "Videocard0"
Driver "fglrx"
Option "VideoOverlay" "on"
EndSection

Section "Device"
Identifier "aticonfig-Device[0]"
Driver "fglrx"
Option "VideoOverlay" "on"
EndSection

Section "Screen"
Identifier "Screen0"
Device "Videocard0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1280x1024" "1280x960" "1280x800" "1152x864" "1152x864" "1152x768" "1152x768" "1024x768" "1024x768" "800x600" "800x600" "640x480" "640x480"
EndSubSection
EndSection

Section "Screen"
Identifier "aticonfig-Screen[0]"
Device "aticonfig-Device[0]"
Monitor "aticonfig-Monitor[0]"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1280x1024" "1280x960" "1280x800" "1152x864" "1152x864" "1152x768" "1152x768" "1024x768" "1024x768" "800x600" "800x600" "640x480" "640x480"
EndSubSection
EndSection

Section "DRI"
Group 0
Mode 0666
EndSection

Section "Extensions"
Option "Composite" "False"
EndSection

I also read that if you want to have a certain resolution and frequency you have to generate some modelines and at them to my xorg.conf. Here are some generators witch I found in the internet:

http://zaph.com/Modeline/
http://www.bohne-lang.de/spec/linux/modeline/
http://xtiming.sourceforge.net/cgi-bin/xtiming.pl
http://sh.nu/nvidia/gtf.php

But I don't know which one I should use as for the same parameters I get different modelines. Anyone knows witch one is the best?

Thx!

Hannes

budword · 12-13-2006, 05:23 AM

Have you tried just commenting out all the options you don't want, then restarting your x server ? Make sure you make a back up (Xorg.conf or whatever it is) so you can restore your current (sort of) working x config. I'm no Xorg guru though, so take this with a grain or 3 of salt.

Good luck....

David

wladimir-blumenkohl · 12-13-2006, 07:58 AM

I already tried this option but the frquency still isn't at 100Hz.

farslayer · 12-13-2006, 08:53 AM

The higher the resolution the lower the frequency, might be pressing it to hit 100hz at that resolution

According to the Manufacturers specifications here are the available modes for your monitor..

Code:

Factory Preset Resolution Modes: 
640 x 480 / 60 Hz ¦ 
640 x 480 / 75 Hz ¦ 
640 x 480 / 85 Hz ¦ 
720 x 400 / 70 Hz ¦ 
800 x 600 / 75 Hz ¦ 
800 x 600 / 85 Hz ¦ 
1024 x 768 / 85 Hz ¦ 
1024 x 768 / 75 Hz ¦ 
1152 x 864 / 75 Hz ¦ 
1280 x 1024 / 75 Hz ¦ 
1280 x 1024 / 85 Hz ¦ 
1600 x 1200 / 75 Hz ¦ 
1600 x 1200 / 85 Hz ¦

so as you can see 1280x1024 @ 100 is not likely to ever happen on that display per the manufacturers specifications..

wladimir-blumenkohl · 12-13-2006, 12:20 PM

This entries are only showing PRESET modes. In WinXp witch I'm running on the same computer I'm using 1152x864 @ 100 Hz for a few years now without any problems.
I already tried 1280x960 @ 100 Hz and it also works perfectly but maybe this mode is not good for the monitor.
At least the mode 1152x864 I'd like to get running at 100 Hz! I think this mode doesn't damage my monitor.