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Cant change monitor resolution

Antony Wright
Frequent Advisor

Cant change monitor resolution

Hi all,
Im running Debian on a Proliant ML370 but Im having problems with screen resolution. The monitor is a Compaq SVGA (472p). I cannot get anything other than a screen resolution of 640x480. I know its capable of more as when I tested the server with fedora 4 I could happily get 800x600 on the same monitor. Can anyone help? Please make the answer nice and easy to follow as Im still a newbee to Linux :) The following is a copy of the relevant part of the script from the XF86Config-4:

Section "Device"
Identifier "ATI Technologies, Inc. 3D Rage IIC 215IIC
[Mach64 GT IIC]"
Driver "ati"
EndSection

Section "Monitor"
Identifier "Compaq SVGA"
HorizSync 28-33
VertRefresh 43-72
Option "DPMS"
EndSection

Section "Screen"
Identifier "Compaq SVGA"
Device "ATI Technologies, Inc. 3D Rage IIC 215IIC
[Mach64 GT IIC]"
Monitor "Compaq SVGA"
DefaultDepth 16
SubSection "Display"
Depth 1
Modes "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 4
Modes "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 8
Modes "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 15
Modes "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 16
Modes "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 24
Modes "800x600" "640x480"
EndSubSection
EndSection

Section "ServerLayout"
Identifier "Default Layout"
Screen "Compaq SVGA"
InputDevice "Generic Keyboard"
InputDevice "Configured Mouse"
EndSection

Section "DRI"
Mode 0666
EndSection

11 REPLIES
Steven E. Protter
Exalted Contributor

Re: Cant change monitor resolution

Shalom,

Try using the GUI on the menu.

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Steven E Protter
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Bill Thorsteinson
Honored Contributor

Re: Cant change monitor resolution

Check the output in /var/log/Xfree86.0.log
This will tell you what is happening during
startup of the x-window system.
I believe ctrl-alt-kp+ will switch available
resolutions.
Rick Garland
Honored Contributor

Re: Cant change monitor resolution

The GUI menu choices should have an option for 'System Settings' Drill down and you should find 'Display'

Invoke this option, supply the root passwd, do the mods.
Antony Wright
Frequent Advisor

Re: Cant change monitor resolution

Hi,
Ive already tried Rick and Steves suggestions. Unfortunatley the on ly option that I have there is for 'screen resolution' and while this is the correct item - it only give me the option of 640x480 - on other option is present - hence my problem.
AS for Bills suggestion - although I can view the file - it has very little meaning to me at the moment so I dont even really know what Im looking for there. (Due to my lack of understanding of linux in general).So I guess I need know what that file is telling me. I'll put up another post shortly and attach the file so you good folk can advise me further :) (Im running this from a workstation not from the server concerend). Thanks anyway for your suggestions.
Antony
Antony Wright
Frequent Advisor

Re: Cant change monitor resolution

ok - heres the file (added as an attachement)
Claudio Cilloni
Honored Contributor

Re: Cant change monitor resolution

you can try deleting all the SubSection "Display" and leaving just one like this:

SubSection "Display"
Depth 24
Modes "800x600"
EndSubSection

this should give no choice to X about the screen resolution and depth.

remember to restart the X server.

hth!

ciao
Claudio
Pau Garcia i Quiles
Frequent Advisor

Re: Cant change monitor resolution


Oh my! I answer this question *every* week here.

You need to edit /etc/X11/xorg.conf and add a new modeline. You'll have to use a modeline calculator for that. Look at these threads to find a step-by-step procedure:
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=1014637
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=1013122
Antony Wright
Frequent Advisor

Re: Cant change monitor resolution

I havent yet deleted anything from the file as suggested but Just checking in the /etc/X11/ folder I do not have a xorg.conf file to alter so therin lies a problem unless its hidden away in one of the subdirectories. I'll take a peek.
Antony Wright
Frequent Advisor

Re: Cant change monitor resolution

Doing a search of the harddrive comes up negative the file is not on the system.
Pau Garcia i Quiles
Frequent Advisor

Re: Cant change monitor resolution

OK, you are still using the old X11 server (XFree86 instead of X.Org), so your file is /etc/X11/XF86Config-4.

Perform the changes I advised on XF86Config-4 instead of xorg.conf (both files are 99% identical).
Antony Wright
Frequent Advisor

Re: Cant change monitor resolution

Tried that already.

BUT I have solved the problem. The horzontal was set to a default setting. I finally managed to find specs for the monitor on the web and set accordingly. I now have 800x600.
Thanks for all the suggestions.

Antony