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.

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.

I believe it goes in the monitor section ... check the Suse xorg.conf to make sure.