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Old 07-21-2013, 12:12 PM   #1
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Registered: Apr 2011
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Question Making "undetected resolutions" stick ???

After installing Xorg-X11 i found out that my Monitor resolution [1600*900 60] wasn't there. After searching and asking in irc channel i found this way:

creating with cvt
cvt 1600 900

1600x900 59.95 Hz (CVT 1.44M9) hsync: 55.99 kHz; pclk: 118.25 MHz
Modeline "1600x900_60.00"  118.25  1600 1696 1856 2112  900 903 908 934 -hsync +vsync
 xrandr --newmode "1600x900_60.00"  118.25  1600 1696 1856 2112  900 903 908 934 -hsync +vsync

xrandr --addmode VGA1 "1600x900_60.00"

 xrandr --output VGA1 --mode "1600x900_60.00"
Note: after restart all of the above procedures will lost.

in the arch linux wiki says a way to make it stick and i did it is my /etc/X11/xorg.conf

Section "Device"
  Identifier  "Intel Xeon"
  Option      "Monitor-VGA1" "VGA screen"
Section "Monitor"
  Identifier  "VGA screen"
  Modeline	   "1600x900_60.00"  118.25  1600 1696 1856 2112  900 903 908 934 -Hsync +Vsync
  Option      "PreferredMode" "1600x900"
Section "Screen"
    Identifier      "Primary Screen"
    Device          "Intel Xeon"
    DefaultDepth    24
    SubSection "Display"
        Depth           24
        Modes   "1600x900"
But there is no use after all this work. the restart will undo all the work. even the 1600*900 will disappear from the xrandr command output.
How could i make it Persistent

also here is My xorg log:

Last edited by krax; 07-21-2013 at 12:14 PM.
Old 07-23-2013, 07:54 PM   #2
Registered: Mar 2013
Location: Florida, USA
Distribution: Slackware, FreeBSD
Posts: 210

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Judging by the link you gave, you might change the PreferredMode option to "1600x900_60.00" and try again.

Otherwise, give an idea of what you're trying, and maybe somebody can help. The procedure for doing this has changed a little bit over the years. Last time I had to do this, I made a Modes section "ModesToUse" with all of the Modelines I wanted to use, then specified in the Monitor section something like UseModes "ModesToUse". Don't try this idea quite yet.

Xorg won't use a mode if it thinks your monitor can't handle it. If you can find the horizontal sync and vertical refresh ranges of your monitor and specify them in the Monitor section, it will increase your chances of being able to use certain modes. Sometimes, that can be found by runing `Xorg -configure`, starting X once, then looking at your Xorg.0.log file. Really, though, if you can find the book or PDF that goes with your monitor, the numbers are most convenient to get from there.
Old 07-23-2013, 08:03 PM   #3
Registered: Mar 2013
Location: Florida, USA
Distribution: Slackware, FreeBSD
Posts: 210

Rep: Reputation: 76
Oh, I forgot a couple of things. First, make sure your Xorg.conf is in the correct place (on Slackware, it's /etc/X11/xorg.conf). Second, to see what resolutions are being recognized, you can fire up xvidtune and click the Next and Prev buttons to iterate through the modes. Sometimes, you have to specify the modes to use in the Display section, and it's best to start with the mode you want to use first, then lower resolutions in descending order.


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