On Sat, 2011-03-05 at 18:37 +0000, Triadi Krisnawan wrote:
Dear Experts,
My machine is using Fedora. The current resolution display is
1024x768_60Hz and it shows flickerring every now and then.
I know that the max screen resolution can handle is 1280x1024_60Hz but
I cant change it by simply go to display preference.
Under the display preferences the max resolution option is 1024x768
which is currently use.
At the back of the machine, the display output is DVI port but then
the installation here is converted to VGA port (via DVI to VGA
adapter) and from the VGA port comes to a VGA splitter then connected
to 3 monitors.
Yesterday I did try to modify the xorg.conf file as following (the one
that I added is on the red)
Section "Monitor" (mon "0")
...
...
Modeline "1280x1024_60"
Option "PreferredMode" "1280x1024_60"
Section "Screen"
...
...
Modes "1280x1024_60"
Triadi,
Two possibilities.
(1) Your VGA splitter device might limit its output resolution to
1024x768. That's common with VGA-type KVMs.
(2) Your Modeline statement looks incomplete. Try using the gtf utility:
$ gtf 1280 1024 60
You'll get an output line that looks like this:
# 1280x1024 @ 60.00 Hz (GTF) hsync: 63.60 kHz; pclk: 108.88 MHz
Modeline "1280x1024_60.00" 108.88 1280 1360 1496 1712 1024 1025
1028 1060 -HSync +Vsync
Try copying and pasting those two lines into your xorg.conf file. I had
to replace the underscore '_' character in the double-quotes string with
a space ' ' to get it to work in my system.
Hope this helps.
--Doc Savage
Fairview Heights, IL