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unable to view x after install new montior

I am running suse 10, I just install a new montior, a LCD HD. X starts but the monitor goes blank then show "out of range". I plugged the old monitor back to try to find a resolution that is compadible but no luck. I can view the command prompt at startup and if I go to a terminal.
Is it possible to set a specific resolution and freq? I have a list of supported rez and freqs from the manual for the HD LCD monitor. I really do not want to re-install, I have a few apps that is not available in yast and would be an absolute pain to install and config again.
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douglasmbeck
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douglasmbeck
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1 Solution
 
Gabriel OrozcoSolution ArchitectCommented:
I had the same problem with a suse 10.1

I booted using failproof mode, this gave me vga resolution. there I was able to modify parameters from the monitor.
if that does not work, enter via network and send a
init 3

this will disable graphic mode.
you can then use yast2 in text to rescan your monitor tipe and try again
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m1tk4Commented:
Try pressing Ctrl-Alt-+ (on numeric keypad) and Ctrl-Alt--(numeric keypad). This will switch to a lower/higher res temporarily, from there you can get to resolution settings.
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Gabriel OrozcoSolution ArchitectCommented:
it didn't work at my SuSE when I tried it... hope it works with douglasmbeck
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gtkfreakCommented:
Switch to text mode (commandline) on your screen. You can try Ctrl+Alt+BackSpace to exit X in case it is loaded. Login as root.

You can set the Horizontal and Vertical Frequencies in a file in X. The file is located at /etc/X11/XF86Config or /etc/X11/xorg.conf

Copy out the original file so that you are able to restore it in case you have a problem.

Search for entry called HorizSync & VertRefresh and enter the range according to the values in your monitor manual. It should be in section called Monitor. You can also change the default resolution and DefaultDepth to suit your monitor resolution.
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rindiCommented:
SuSE uses a tool called sax (or sax2) which you can use to set the resolution and refresh rates. Just start sax from a console and then change the settings to suit your new monitor. Remember, an LCD generally uses a refresh rate of 60Hz, no more!
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douglasmbeckAuthor Commented:
One quick question so I don't make this completely unbootable, I have four setting provided in the manual for each specific setting . Example:

Resolution 1024 X 768,
Horizontal freq. 60.00 khz,
Vertical freq 75.00 hz,
Dot clock freq 78.75 mhz.

so would this be the settings I use??
HorizSync 60.00 khz
VertRefresh 75.00 hz
default resolution 1024 X 768

What is the DefaultDepth?
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douglasmbeckAuthor Commented:
By the way rindi, that was the first thing I tried but, 'cause of the fact I am not using an bonified computer LCD monitor I need to use a more custom setting than what the tool provided. Just so you know what I am dealing with, its a LCD HD monitor with a VGA d-sub input. By the way would I be able to use widescreen? I am not able to in windows so I think it less than likely in Linux but if anyone knows a trick or two let me know.
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rindiCommented:
The color depth is defined by the VGA card, not the monitor, and depends on the amount of display memory. Widescreen again depends on the vga card, and it's driver, but should be possible.
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Gabriel OrozcoSolution ArchitectCommented:
Always try the slowes refresh time first, then try the better ones
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rindiCommented:
For LCD displays, it isn't necessary to try higher rates, as those displays don't really work with refresh rates. That's a relict from CRT monitors, where if you used a low refresh rate the display would flicker more. On an LCD all the pixels are served at the same time, and the refresh rate is only used by the input electronics so the same VGA input can be used. To make the Input electronics cheaper they usually only work with 60 Hz (more expensive displays may have a range of 60 - 75 Hz), but that doesn't make any difference on the display quality, so you should stay at the lower rate, that way the settings will be compatible with more models.
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douglasmbeckAuthor Commented:
It appears I would need to set this in sax2 as rindi stated. Rindi, how would I start sax2 from the command prompt? What I did before was via a GUI interface in X. I guess it is not the same thing.

Just to let others know, the xorg.conf file has a warning not to modify the file and the file is automatically generated and edited by sax2.
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rindiCommented:
At the moment I'm not using SuSE so I can't be absolutely sure, but just try, as root sax or sax2 (if sax2 needs the gui to be able to set itself up, sax should also work, which is the older version and should run without the gui).
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