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Red Hat Linux Display Resolution Problem - which file can I edit to lower the default screen resolution ?

I have a Red Hat Linux installation that I have a problem with.

I have a KVM attached to the server which I can access remotely, but every time I do I get a message to say that the screen resolution is too high to be displayed.

I can still access and manage this server via Webmin, so is anyone able to tell me if there is a file that I can go and edit to lower the default screen resolution so that I can then reboot my server and access it via the KVM ?

I am very much a novice on Linux, so please don't assume any level of knowledge on my part as I don't have much !

TIA


Rob
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2 Solutions
 
Jan SpringerCommented:
as the root users, edit /etc/X/xorg.conf

go to the Section "Screen" and the subsection "Display"

remove the higher resolutions one at a time until you find the resolution that your driver supports.
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Kerem ERSOYPresidentCommented:
Hi,

You can list all resolution options in your /etc/X11/xorg.conf. You can modify the highest resolution there.

You can hit Ctrl + Alt + - (numeric pad minus) to switch between acceptable resolutions to get a display.

Another option is to start you RedHAT while you are switched to the system and then it will detect your display. Then You'll edit your Display Resolution and click make this default for this system.

Don't forget to logout / login.
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Richard OlutolaConsultantCommented:
Out of interest, what is the screen on your KVM? It is an HP wide screen? What is the model? What RH version are you running?
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Kerem ERSOYPresidentCommented:
roluta: It has happened to me several times. X sometimes sets monitor to some wierd clock frequency that the monitor does not support. But this beahviour changes if you start your system when the kvm is switched to this particular server or not. I guess this is because the dirver assumes that the monitor responding to smoe frequency (since kvm acknowledges while the monitorr does not.
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Richard OlutolaConsultantCommented:
I have experinced similar problem but only during new installation. The screen is a TFT screen with 1440 x 900 resolution. I guess RedHat default resolution is not compatible. My workaround has been to connect a 17" CRT, configure the display and logout and login while now connected back to the TFT screen and it works happily ever after.
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Kerem ERSOYPresidentCommented:
I had the similar problem with a 17" CRT attached to a KVM switch. Though I'd set the value correctly over the RedHAT linux. The problem with the KVM is that:  If a screen is attached to a port the monitor will respond to the od directly but If the KVM is switched in antoher port then the KVM will emulate a monitor to the os. Only when the os interprets the response from the KVM it sometimes think that it has different capabilties than the original display. This is what causes a problem if the monitor is lacking to accomodate this frequency.

So if you don't fix the settings (using the GUI setting) / or keep using a generic monitor setting such as a generic 1024*768 etc. The best thing to do is to modify /etc/X11/xorg.conf "Monitor" section to define the actual HorizSync and VertRefresh rates correctly.
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Kerem ERSOYPresidentCommented:
then editing the "Screen" seciton "Modes" property.
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Jan SpringerCommented:
I had this very same problem.  It was the KVM.  Problem was fixed when I replaced them with Belkin KVMs.
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Richard OlutolaConsultantCommented:
R u there Rob?
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Richard OlutolaConsultantCommented:
why not rolutola?
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Jan SpringerCommented:
You didn't answer the question and your solution isn't practical with the inclusion of the KVM.
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Richard OlutolaConsultantCommented:
What do you mean by 'answer' the question? Did you 'answer' the question?

I was talking to rindi.

I don't make money from EE. By all means take all the points if it makes you important.

R.
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Richard OlutolaConsultantCommented:
I gave a solution which worked for me to work around the problem.
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Jan SpringerCommented:
For your review:

"...so is anyone able to tell me if there is a file that I can go and edit to lower the default screen resolution so that I can then reboot my server and access it via the KVM ?"
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Computer101Commented:
Forced accept.

Computer101
EE Admin
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