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Old 07-29-2006, 04:00 PM   #1
vraidroit
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Monitor Refresh Rate


I have installed Debian on my 2nd machine now - however this one I am using a Dell 1500FP screen. Problem is - when I boot my computer with the screen on it goes to 75Hz refresh rate which causes my screen to say that this resolution is not supported. However, if I boot with the screen off and then turn it on, it looks perfect and is at 60Hz.

Is there somewhere I can adjust so it always loads at 60Hz regardless? Would I edit some stuff in the xorg.conf?

Thanks for all your help.
 
Old 07-30-2006, 01:59 AM   #2
AwesomeMachine
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You can edit /etc/X11/xorg.conf. You should be able to figure it out. Just take out every setting you monitor will not support, which is all but one. I don't know which one that is, you'll have to look in the manual for what it runs at natively. That's where you want to run the monitor. So, if the monitor runs at 60 Hz vertical refresh, and 1280 x 1024 resolution natively, that should be the only thing in xorg.conf. CRT monitors run at many different settings, LCD's do not.
 
Old 07-30-2006, 02:45 AM   #3
konsolebox
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perhaps you didn't enter the correct h-sync and v-sync rates of your monitor. try to find the user's manual or some specs in a vendor's site with the same product as your monitor and then (re-)run xorgconfig. almost all the questions on the setup are easy to answer if you only have the proper data.

Edit: sorry but i guess it's much easier to just edit your xorg.conf and change the values there.

Last edited by konsolebox; 07-30-2006 at 02:48 AM.
 
Old 07-30-2006, 04:11 AM   #4
vraidroit
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well i have contiued to play around - with no luck. here is my xorg.conf file:

Section "Monitor"
Identifier "Generic Monitor"
Option "DPMS"
HorizSync 28-58
VertRefresh 60
EndSection

Section "Screen"
Identifier "Default Screen"
Device "Intel Corporation 82845G/GL[Brookdale-G]/GE Chipset Integrated Graphics Device"
Monitor "Generic Monitor"
DefaultDepth 16
SubSection "Display"
Depth 1
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 4
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 8
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 15
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 16
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 24
Modes "1024x768" "800x600" "640x480"
EndSubSection
EndSection


I even played around to the point that it wasnt able to load gnome... luckily I was able to figure out how to change the last settings back with only the prompt.

I am trying to run 1024x768 at 60 Hz. Somehow when it is booted with the monitor on (or switch between users) it goes to 1024x768 at 75Hz - which completly messes up the screen.

Anyhelp would be greatly appreciated.
 
Old 07-30-2006, 04:37 AM   #5
konsolebox
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Did you check the display settings of your desktop manager? Sometimes they're different with X's.
 
Old 07-30-2006, 04:44 AM   #6
vraidroit
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Quote:
Originally Posted by konsolebox
Did you check the display settings of your desktop manager? Sometimes they're different with X's.
where can I view that?
 
Old 07-30-2006, 05:16 AM   #7
konsolebox
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i don't with how to do it in gnome but in kde's kmenu. click k menu, control center, peripherals then display. just a suggestion here. perhaps they're only the same.
 
Old 07-30-2006, 01:39 PM   #8
vraidroit
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yea in preferences > screen resolution it says 1024x768 75Hz - but I cannot change anything there...
Any suggestions?
 
Old 07-30-2006, 02:05 PM   #9
konsolebox
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try to use the control center to install your monitor. add some specs there about your monitor then restart X.
 
Old 07-31-2006, 12:04 AM   #10
vraidroit
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how to I install a monitor in control center?
 
Old 07-31-2006, 01:01 AM   #11
konsolebox
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sorry i was mistaken. i was thinking about xorgcfg's panels not control center. anyway pls just forget about it.

btw you check out this forum: http://www.ubuntuforums.org/showthread.php?t=83973. they have an info about adding custom modelines for X. maybe it can help fix your problem.
 
Old 07-31-2006, 01:23 AM   #12
MasterC
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Quote:
Originally Posted by vraidroit
I have installed Debian on my 2nd machine now - however this one I am using a Dell 1500FP screen. Problem is - when I boot my computer with the screen on it goes to 75Hz refresh rate which causes my screen to say that this resolution is not supported. However, if I boot with the screen off and then turn it on, it looks perfect and is at 60Hz.

Is there somewhere I can adjust so it always loads at 60Hz regardless? Would I edit some stuff in the xorg.conf?

Thanks for all your help.
When you boot up your machine, do you go directly into a GUI? Also, when you boot your machine, do you get a nice looking 'starting up' screen instead of ugly scrolling information?

My first thought is that the kernel vesafb is set to a static refresh of 75, which, if that's the case, you'll need to reconfigure the kernel to either remove vesafb all together, or lower the refresh it's trying to use. My second thought is that Xorg is probing for EDID information and either your monitor is providing bad info, or none at all, so it just guesses. The problem being, I am not sure how you can stop the probing other than using a custom Modeline, and even then, I don't know what the modeline for your setup might be...

If the vesafb doesn't end up fixing it, post back with more information about your video hardware (what videocard and modules are being loaded) and see if someone can hunt down a modeline for you or provide more information for your situation.

Good luck!

Cool
 
Old 08-01-2006, 12:15 AM   #13
lurko
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can't the refresh rate be specified in the same place as the resolutions in xorg.conf?? like so: 1024x768_60 ?

so your Screen section would look more like this:

Code:
Depth 16
Modes "1024x768_60" "800x600_60" "640x480_60"
EndSubSection
SubSection "Display"
Depth 24
Modes "1024x768_60" "800x600_60" "640x480_60"
EndSubSection
EndSection
of course you'll have to be sure that the refresh rate you define is supported at the resolutions you assign it to.
 
Old 08-05-2006, 04:51 PM   #14
vraidroit
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when booting the computer - all of the boot information looks perfect. then when the GUI loads to the login screen (gnome) my screen flashes and then puts out an error.

however, if I boot the computer with the screen off - and then turn it on when the GUI has loaded to the login screen it is fine (however, swiching between users produces some shifty results).

lurko i havne't tried that option yet - is that a viable option?

thanks.
 
Old 08-13-2006, 02:28 AM   #15
lurko
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well I've read that is... KDE seems to set the refresh rate well enough, so I haven't really used it.

However I was just now playing around with my setup, trying different resolutions on my TV and I decided to throw the option into my setup in hopes of giving you an answer. Now it doesn't seem to work at all for my tv:
Code:
(II) NVIDIA(0): Assigned Display Device: TV-0
(WW) NVIDIA(0): No valid modes for "400x300_60"; removing.
(WW) NVIDIA(0): No valid modes for "640x480_60"; removing.
...snip...
(II) NVIDIA(0): Validated modes:
(II) NVIDIA(0):     "nvidia-auto-select"
(II) NVIDIA(0): Virtual screen size determined to be 1024 x 768
...snip...
(II) NVIDIA(0): Setting mode "nvidia-auto-select"
but according to the log all the modes for my CRT are accepted
Code:
(II) NVIDIA(0): Assigned Display Device: CRT-1
(II) NVIDIA(0): Validated modes:
(II) NVIDIA(0):     "1600x1200_85"
(II) NVIDIA(0):     "1280x1024_85"
(II) NVIDIA(0):     "1024x768_85"
(II) NVIDIA(0):     "800x600_85"
(II) NVIDIA(0): Virtual screen size determined to be 1600 x 1200
...snip
(II) NVIDIA(0): Setting mode "1600x1200_85"
so anyway, it looks valid enough to me, for CRTs anyway.. did you try it already??
 
  


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