On Saturday 01 November 2008 22:08, Marko Vojinovic wrote:
> Basically, what I did was to run system-config-display to reconfigure for
> the new monitor and resolution. All goes well, but after X restarts, I see
> a strange picture: the resolution indeed goes to 1680x1050 as is supposed
> to, but is squeezed/shrinked/scaled horizontally to match a 4:3 aspect
> ratio, leaving two (unequal) black bands on the left and right side of the
> monitor.
[snip]
> The very same hardware and virtually same X configuration work perfectly ok
> on FC4
[snip]
Ok, just for the record, I resolved the issue, in the following way:
- took the exact modeline parameters for 1680x1050 (known to work) from FC4's
Xorg.0.log and copy-pasted it into CentOS's xorg.conf
- also took the DisplaySize, HorizSync and VertRefresh parameters from the
Fedora's log and put it into xorg.conf
- Disabled the DDC (undocumented option!!!) <----- CRUCIAL PART !!!
- took the modeline parameters for various other resolutions since without DDC
nothing gets autoconfigured
- restarted X
Now everything works perfectly, and my hacked xorg.conf is just the default
one with the following "Monitor" section:
Section "Monitor"
Identifier "Monitor0"
ModelName "LCD Panel 1680x1050"
# hacked DisplaySize --- note that the values are *wrong*,
# monitor is actually 470x300 mm
DisplaySize 370 280
HorizSync 31.5 - 90.0
VertRefresh 60.0 - 60.0
Option "dpms"
# turned off the DDC; didn't know which option would do
# the job so put them both there
Option "NoDDC" "true"
Option "DDC" "false"
# various modelines, taken from Fedora's log:
Modeline "1680x1050" 147.14 1680 1784 1968 2256 1050 1051 1054 1087 -hsync
+vsync
Modeline "1400x1050" 122.00 1400 1488 1640 1880 1050 1052 1064 1082 +hsync
+vsync
Modeline "800x600" 40.00 800 840 968 1056 600 601 605 628 +hsync +vsync
Modeline "640x480" 25.20 640 656 752 800 480 490 492 525 -hsync -vsync
EndSection
Hopefully someone with a similar problem maybe finds this useful. ;-)
Best, :-)
Marko
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