ABOUT ME

-

Today
-
Yesterday
-
Total
-
  • xorg.conf with an external monitor
    Computer/linux 2008.12.17 20:09
    The recent xorg server does not support the old xinerama setting, precisely Option "MonitorLayout" in the Device Section. The old configuration of xorg.conf are
    2007/03/05 - [computer/linux] - Xinerama on Ubuntu 6.10 with open source driver
    2008/02/06 - [computer/linux] - modified xorg.conf file

    Again....
    I spent several days to understand this inconvenient HISTORY about xorg. Finally everthing is o.k. now.

    Now,  a part of the brand-new xorg.conf file is
    Section "Monitor"
            Identifier      "Laptop"
            HorizSync       28-64
            VertRefresh     43-60
            Gamma           1.0
            Option          "DPMS" "true"
    EndSection

    Section "Monitor"
            Identifier      "DellE177FPf"
            DisplaySize     339.92  270.336
            HorizSync       30-81
            VertRefresh    56-76
            Gamma           0.9
            Modeline        "1280x1024_75.00"  135.00 1280 1296 1440 1688 1024 1025 1028 1066  -HSync +Vsync
            Option          "PreferredMode" "1280x1024_75.00"
            Option          "RightOf"       "Laptop"
            Option          "DPMS" "true"
    EndSection 

    Section "Device"
    Identifier      "Radeon Mobility X700 (RV410 PCIE)"
            Driver          "ati"
            BusID           "PCI:1:0:0"
            Option          "Monitor-VGA-0" "DellE177FPf"
            Option          "Monitor-LVDS"  "Laptop"
    EndSection

    Section "Screen"
            Identifier      "Default Screen"
            Monitor         "Laptop"
            Device          "Radeon Mobility X700 (RV410 PCIE)"
            DefaultDepth    24
            SubSection "Display"
                    Depth           24
                    Virtual         2560 1824
            EndSubSection
    EndSection

    Section "ServerLayout"
            Identifier      "Default Layout"
            Screen          "Default Screen"
            InputDevice     "Synaptics Touchpad"
            Option          "BlankTime"           "10"
            Option          "Standby"               "20"
            Option          "SuspendTime"       "30"
            Option          "OffTime"               "40"
    EndSection

    But, The methods which are well-described in the following references are not the solutions to my laptop.

    Now, the classic story is ....


    1. Monitor Section
    There are two monitors: one is the laptop panel, the other is an external monitor, for me Dell E177FPf.  In the xorg.conf, the gray colored texts are "optional" that is not critical for my machine.

    The Dell monitor spec is on http://accessories.us.dell.com/sna/products/Displays/productdetail.aspx?c=us&l=en&cs=19&sku=320-5577 and is listed in the more

    더보기


    DisplaySize is calculated according to http://www.x.org/wiki/FAQVideoModes as

    horizontal = resolution*dotpitch = 1280*0.264 = 337.92,
    vertical = resolution*dotpitch = 1024*0.264 = 270.336,

    or xdpyinfo | grep -B 2 dot

    The references suggest to use "gtf" or "cvt" to get Modeline, but I could not get the correct ModeLine by this. Fortunately, I have another linux machine to use the same monitor, I looked into /var/log/X.org.0.log file, then I found the correct modeline.

    gtf returns
     gtf 1280 1024 75 -x

      # 1280x1024 @ 75.00 Hz (GTF) hsync: 80.17 kHz; pclk: 138.54 MHz
      Modeline "1280x1024_75.00"  138.54  1280 1368 1504 1728  1024 1025 1028 1069  -HSync +Vsync

    cvt returns
     cvt 1280 1024 75
    # 1280x1024 74.90 Hz (CVT 1.31M4) hsync: 80.30 kHz; pclk: 138.75 MHz
    Modeline "1280x1024_75.00"  138.75  1280 1368 1504 1728  1024 1027 1034 1072 -hsync +vsync

    other machine X.org.0.log
    (**) NV(0): *Default mode "1280x1024": 135.0 MHz, 80.0 kHz, 75.0 Hz
    (II) NV(0): Modeline "1280x1024"  135.00  1280 1296 1440 1688  1024 1025 1028 1066 +hsync +vsync
    (**) NV(0):  Default mode "1280x1024": 108.0 MHz, 64.0 kHz, 60.0 Hz
    (II) NV(0): Modeline "1280x1024"  108.00  1280 1328 1440 1688  1024 1025 1028 1066 +hsync +vsync
    (**) NV(0):  Default mode "1280x960": 108.0 MHz, 60.0 kHz, 60.0 Hz



    2. Device Section
    Using lspci |grep VGA
    01:00.0 VGA compatible controller: ATI Technologies Inc Radeon Mobility X700 (PCIE)
    Thus,     BusID           "PCI:1:0:0"

    For ATI driver, outputs of the video card are
    • LVDS  : laptop panel
    • VGA-0 : RGB output
    LVDS and VGA-0 are called "outputname" in the man page of xorg.conf (line around 650 man xorg.conf). This can be checked by xrandr -q.

    3.  Screen Section

    Virtual is calculated  by

    Laptop panel is 1280x800, and the dell monitor 1280x1024
    1280+1280 = 2560
    800+1024 = 1824


    4. Final screenshot


    ...

    댓글 0

Designed by Tistory.