can't get RHEL display resolution to change

guest · 03-12-2005, 02:48 AM

I can't get my resolution to change for the life of me... i switched to 640x480.. restarted.. no change.. changed it back to 800x600.. restarted.. still no change... anyone experienced this problem b4?

trickykid · 03-12-2005, 10:40 AM

How are you attempting to change the resolution? From command line editing the config or thru a GUI? Better and more details always helps in us providing better replies and possible solutions!

guest · 03-12-2005, 05:32 PM

sorry.. it's GUI... i went to Applications > System Settings > Display.. and changed the setting there..

I've even specified my monitor is 1024x768.. the resolution option doesn't even give me that option.. it only gives me 640x480 & 800x600..

trickykid · 03-12-2005, 05:54 PM

Quote:

Originally posted by guest
sorry.. it's GUI... i went to Applications > System Settings > Display.. and changed the setting there..

I've even specified my monitor is 1024x768.. the resolution option doesn't even give me that option.. it only gives me 640x480 & 800x600..

Don't use this tool, it never seems to work as I've encountered this before. For the best results in what you want, edit the XF86config file manually.

guest · 03-12-2005, 09:17 PM

i opened the xf86config.py file.. but what line do i edit to force the resolution?

i also went to Applications > Preferences > Screen Resolution.. and my only choice there was 640x480

guest · 03-13-2005, 12:29 PM

help anyone? =)

homey · 03-13-2005, 01:02 PM

It's possible that you have the wrong video card and / or monitor selected. I haven't had any problem using the redhat-config-display or in the case of Fedora3 system-config-display .
If you do want to edit the file, it would be nice to know what your system has.
As root user, type the command: ddcprobe and note the information.

For example, here's my output:

Code:

#ddcprobe
Videocard DDC probe results
Description:  Intel Corporation Intel(R) 8xx Chipset
Memory (MB):  1

Monitor DDC probe results
ID: SNY0450
Name: Sony CPD-100ES
Horizontal Sync (kHZ): 30-70
Vertical Sync (HZ)  : 50-120
Width (mm): 280
Height(mm): 210

On my system, that goes in the /etc/X11/xorg.conf . That should be similar in your XF86config file like this..

Code:

Section "Monitor"
	Identifier   "Monitor0"
	VendorName   "Monitor Vendor"
	ModelName    "Sony CPD-100ES"
	DisplaySize  280	210
	HorizSync    30.0 - 70.0
	VertRefresh  50.0 - 120.0
	Option	    "dpms"
EndSection
Section "Screen"
	Identifier "Screen0"
	Device     "Videocard0"
	Monitor    "Monitor0"
	DefaultDepth     24
	SubSection "Display"
		Viewport   0 0
		Depth     16
		Modes    "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Viewport   0 0
		Depth     24
		Modes    "1024x768" "800x600" "640x480"
	EndSubSection
EndSection

Also, the video card information , I ran the comand: lspci |grep VGA
That returns somthing like this, so I look in the config file for related info....
00:01.0 VGA compatible controller: Intel Corp. 82810E DC-133 CGC [Chipset Graphics Controller] (rev 03)

Code:

Section "Device"
	Identifier  "Videocard0"
	Driver      "i810"
	VendorName  "Videocard vendor"
	BoardName   "Intel 810"
EndSection

guest · 03-13-2005, 02:49 PM

when i ran ddcprobe.. here's what i got:

Code:

Videocard DDC probe results
Description:  Cirrus Logic GD-5446 VGA
Memory (MB):  1

Monitor DDC probe results
Monitor DDC Probe failed.

my xorg.conf file contains this:

Code:

Section "Monitor"
	Identifier   "Monitor0"
	VendorName   "Monitor Vendor"
	ModelName    "Monitor 1280x1024"
	HorizSync    31.5 - 79.0
	VertRefresh  50.0 - 90.0
	Option	    "dpms"
EndSection

Section "Device"
	Identifier  "Videocard0"
	Driver      "cirrus"
	VendorName  "Videocard vendor"
	BoardName   "Cirrus Logic GD544x"
EndSection

Section "Screen"
	Identifier "Screen0"
	Device     "Videocard0"
	Monitor    "Monitor0"
	DefaultDepth     16
	SubSection "Display"
		Viewport   0 0
		Depth     16
		Modes    "1024x768" "800x600" "640x480"
	EndSubSection
EndSection

lspci |grep VGA retuns this:

Code:

 00:0d.0 VGA compatible controller: Cirrus Logic GD 5446 (rev 45)

homey · 03-13-2005, 03:01 PM

Quote:

VendorName "Monitor Vendor"
ModelName "Monitor 1280x1024"

Quote:

Monitor DDC probe results
Monitor DDC Probe failed.

The VendorName and ModelName are bogus and that is likely because ddcprobe can't even detect it.
I have had that type of problem on some monitors. The only thing that really helped was to swap out the monitor. Here are a couple of things to try though...
First, I would run yum update to make sure everything is current.
Look on the back of the monitor for proper make and model information.
Run the redhat-config-display or system-config-display and manually select the correct monitor. Sometimes, you can select a model which is very close. If there is nothing close, select a generic monitor. If that doesn't help, try another monitor.

guest · 03-13-2005, 11:41 PM

I tried a diff monitor.. still giving me same symptoms... the Applications > Preferences > Screen Resolution
only gives me one choice.. and it's 640x480...

the "Display" pref gives me 2 choices but it doesn't seem like this one matters... "Screen Resolution" seems to be the one the system is following... is there a way to force screen resolution?

perhaps it's my cirrus card... how can i add new video card in RHEL 4 AS? i plugged in another vid card but can't find where i can add it in the RHEL system.. i found Hardware Browser.. but it couldn't detect my new vid card.. hmmm

homey · 03-14-2005, 08:19 AM

I'd kind of like to try one thing at a time. What kind of output do you get with the new monitor and the command: ddcprobe ?

guest · 03-14-2005, 01:10 PM

same result:

Code:

Videocard DDC probe results
Description:  Cirrus Logic GD-5446 VGA
Memory (MB):  1

Monitor DDC probe results
Monitor DDC Probe failed.

homey · 03-14-2005, 01:45 PM

Do you know what is the make and model of your monitor?

guest · 03-14-2005, 02:39 PM

yes it's KDS XFLAT.. i chose Korea Data System - XF models

is this normal? it's been 4 days i've installed linux for the first time.. and i cna't even change the resolution? imagine when i start doing more complicated tasks... this will take forever to learn linux.... very discouraging

homey · 03-14-2005, 02:57 PM

Can you manually put that info into the xorg.conf ?
VendorName "Korea Data System"
ModelName "XF ????" ###Put the model here
Also, try default depth 24

Code:

Section "Monitor"
	Identifier   "Monitor0"
	VendorName   "Korea Data System"
	ModelName    "XF"
	HorizSync    31.5 - 79.0
	VertRefresh  50.0 - 90.0
	Option	    "dpms"
EndSection

Section "Screen"
	Identifier "Screen0"
	Device     "Videocard0"
	Monitor    "Monitor0"
	DefaultDepth     24
	SubSection "Display"
		Viewport   0 0
		Depth     24
		Modes    "1024x768" "800x600" "640x480"
	EndSubSection
EndSection