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Old 04-02-2007, 04:20 AM   #1
Ian B Christie
LQ Newbie
 
Registered: Dec 2004
Location: Melbourne; Australia
Distribution: Ubuntu 8.10, Xubuntu, 64Studio
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Red face Changed screen resolution and now I can't login


I'm setting up an AMD Sempron box with Kubuntu 6.10. I am using an old Daewoo monitor. I changed the screen resolution from something high (1200 x something) to a more useable (on this monitor) 800 x 600. I also chose the monitor from the manufacturer list. It all seemed OK and popped up a message to restart the X-server to use the new settings. I did a reboot (didn't notice the "restart X" option in the login/out menu) and now when I try to login I just get dumped back to the login screen. I can login as any other user and everything works fine, it's just that my personal login was the one which (in Kubuntu) has the su option.

I can login to a shell and can su from there but I don't know what I need to do to restore the screen resolution for my account to something which will work. I presume there is a file which I can edit to fix this but I don't know which file. If there is a log file which would be useful for diagnosis please tell me and I'll put the contents here.

Cheers
Ian Christie
 
Old 04-02-2007, 04:50 AM   #2
jay73
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You could have a look at /var/log/xorg.0.log.

The file that may need some editing is /etc/X11/xorg.conf. Maybe you could post it here so people can get an idea what may be wrong.
 
Old 04-02-2007, 05:52 AM   #3
uma mahesh
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Registered: Feb 2007
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u need to edit /etc/X11/xorg.conf

Instead of booting from hard disk boot from the linux 1st cd and then edit
In that file change the entry for Screen0
U will find "1200*968" "800*600" "640*480"
now remove "1200*968" and save it.

Now restart from harddisk
 
Old 04-02-2007, 07:36 AM   #4
Ian B Christie
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Thanks guys; I'm sure you are pointing me in the right direction.
xorg.conf has a section like this:-

Section "Monitor"
identifier "518X"
vendorname "Daewoo"
modelname "Daewoo 518X"
HorizSync 30.0-54.0
VertRefresh 50.0-120.0
modeline "640x480@60" 25.2 640 656 752 800 480 490 492 525 -vsync -hsync
modeline "640x480@72" 31.5 640 664 704 832 480 489 491 520 -vsync -hsync
modeline "640x480@75" 31.5 640 656 720 840 480 481 484 500 -vsync -hsync
modeline "640x480@85" 36.0 640 696 752 832 480 481 484 509 -vsync -hsync
modeline "800x600@56" 36.0 800 824 896 1024 600 601 603 625 +hsync +vsync
modeline "800x600@72" 50.0 800 856 976 1040 600 637 643 666 +hsync +vsync
modeline "800x600@75" 49.5 800 816 896 1056 600 601 604 625 +hsync +vsync
modeline "800x600@85" 56.3 800 832 896 1048 600 601 604 631 +hsync +vsync
modeline "800x600@60" 40.0 800 840 968 1056 600 601 605 628 +hsync +vsync
modeline "832x624@75" 57.284 832 864 928 1152 624 625 628 667 -vsync -hsync
modeline "1024x768@60" 65.0 1024 1048 1184 1344 768 771 777 806 -vsync -hsync
modeline "1024x768@43" 44.9 1024 1032 1208 1264 768 768 776 817 +hsync interlace +vsync
modeline "1152x768@54" 64.995 1152 1178 1314 1472 768 771 777 806 +hsync +vsync
modeline "1280x854" 80.0 1280 1309 1460 1636 854 857 864 896 +hsync +vsync
gamma 1.0
EndSection

Section "Screen"
Identifier "Default Screen"
Device "Generic Video Card"
Monitor "518X"
DefaultDepth 24
SubSection "Display"
depth 24
virtual 1280 854
modes "1024x768@60" "1024x768@43" "832x624@75" "1152x768@54" "800x600@60" "1280x854" "800x600@85" "800x600@75" "800x600@72" "800x600@56" "640x480@85" "640x480@75" "640x480@72" "640x480@60"
EndSubSection
EndSection

By comparison the file xorg.conf1 looks like:-

Section "Monitor"
Identifier "518X"
Option "DPMS"
EndSection

Section "Screen"
Identifier "Default Screen"
Device "Generic Video Card"
Monitor "518X"
DefaultDepth 24
SubSection "Display"
Depth 1
Modes "1024x768" "800x600" "720x400" "640x480" "1x1"
EndSubSection
SubSection "Display"
Depth 4
Modes "1024x768" "800x600" "720x400" "640x480" "1x1"
EndSubSection
SubSection "Display"
Depth 8
Modes "1024x768" "800x600" "720x400" "640x480" "1x1"
EndSubSection
SubSection "Display"
Depth 15
Modes "1024x768" "800x600" "720x400" "640x480" "1x1"
EndSubSection
SubSection "Display"
Depth 16
Modes "1024x768" "800x600" "720x400" "640x480" "1x1"
EndSubSection
SubSection "Display"
Depth 24
Modes "1024x768" "800x600" "720x400" "640x480" "1x1"
EndSubSection
EndSection

Is there any significance to this?

Should I edit xorg.conf or should I just cut and paste the section from xorg.conf1?

Cheers
Ian
 
Old 04-02-2007, 11:02 PM   #5
Ian B Christie
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Registered: Dec 2004
Location: Melbourne; Australia
Distribution: Ubuntu 8.10, Xubuntu, 64Studio
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OK; I've bitten the bullet and done a reinstall. Screen has installed at 1024 x 768 so I'll just accept that and not fiddle. Thanks anyway, I now know more about configuration than I did previously so your answers wern't wasted. Thanks again
Cheers
Ian
 
Old 04-03-2007, 01:41 AM   #6
J.W.
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Registered: Mar 2003
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Distribution: Mint
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Just press the Ctrl, Alt, and '+' keys simultaneously to scroll through the various resolutions in your xorg.conf file. (Note that the '+' key refers to the + key on the numeric keypad, not the +/= key adjacent to the Backspace key)
 
  


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