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Old 01-30-2007, 06:19 PM   #1
ezor
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Screen flickers after changing resolution


I just did a reinstall of Slack 11.0 and wanted to set the default screen resolution from 1240x768 to 800x600.

First off, messing with xorgconfig was a disaster, so I edited /etc/X11/xorg.conf as follows:

In Subsection "Display" Depth 8, I set modes to "800x600" "1240x768" "640x480" Then I did likewise for Depth 16, 24 & 32.

This worked and got me 800x600 resolution, but now the screen flickers. So I Went back and edited the horizontal sync to 30-70 and vertical sync to 50-160 which is what my monitor manual calls for. Flicker still present.

Should anything be changed here:

Section Device:
Identifier "VESA Framebuffer"
Driver "vesa"
#VideoRam 4096
# Insert Clocks lines here if appropriate
EndSection

or here:

Section "Screen"
Identifier "Screen 1"
Device "VESA Framebuffer"
Monitor "My Monitor"

Note that Vesa Framebuffer is used but I did not select that during the install. I selected "VESA". Also, during the install I selected 4mb video ram which is what I have, but it is commented out.

Finally, 24 was automatically selected for default depth. I tried setting it to 16 with no luck. I'm using Fluxbox.

Thanks for any help.
 
Old 01-30-2007, 06:53 PM   #2
H_TeXMeX_H
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Well, I'm guessing that because you switched aspect ratios, you must change the modeline as well.

Modeline generator
http://xtiming.sourceforge.net/cgi-bin/xtiming.pl
 
Old 01-30-2007, 11:43 PM   #3
ezor
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Quote:
Originally Posted by H_TeXMeX_H
Well, I'm guessing that because you switched aspect ratios, you must change the modeline as well.

Modeline generator
http://xtiming.sourceforge.net/cgi-bin/xtiming.pl
I looked in the Slack xorg.conf and there's no reference to modeline. I have Suse on another box and there is a section on modeline in it's xorg.conf. Anyway, I changed vert sync from 50-160 to 80-160 and played with brightness and contrast. It's not too bad now.
 
Old 01-31-2007, 08:57 PM   #4
H_TeXMeX_H
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Quote:
Originally Posted by ezor
I looked in the Slack xorg.conf and there's no reference to modeline. I have Suse on another box and there is a section on modeline in it's xorg.conf.
I believe it goes in the monitor section ... check the Suse xorg.conf to make sure.
 
  


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