How to change screen resolution
Robert G. (Doc) Savage
dsavage at peaknet.net
Sat Mar 5 19:02:01 UTC 2011
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
More information about the users
mailing list