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Having trouble installing a piece of hardware? Want to know if that peripheral is compatible with Linux?


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Old 10-20-2009, 07:33 PM   #1
Registered: Jun 2007
Location: Poland
Distribution: Arch (used to Debian, Ubuntu)
Posts: 55

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xrandr + dual monitors + problem with scalling


I'm tring to set up my notebook and external monitor to work in a dual-head mode.

This is the configuration I use:
Graphic card - intel
Monitor - Samsung T260HD
- 1920x1200 @ 60Hz
- HorizSync 30.0 - 81.0
- VertRefresh 56.0 - 75.0
- Point Size 0,2865 mm

And some configuration files:
gontek@hapi:~/pxx$ cat xorg.conf 
# xorg.conf (xorg X Window System server configuration file)
# This file was generated by dexconf, the Debian X Configuration tool, using
# values from the debconf database.                                         
# Edit this file with caution, and see the xorg.conf manual page.           
# (Type "man xorg.conf" at the shell prompt.)                               
# This file is automatically updated on xserver-xorg package upgrades *only*
# if it has not been modified since the last upgrade of the xserver-xorg    
# package.                                                                  
# If you have edited this file but would like it to be automatically updated
# again, run the following command:                                         
#   sudo dpkg-reconfigure -phigh xserver-xorg                               

Section "Files"
##      FontPath        "/usr/share/X11/fonts/misc"
##      FontPath        "/usr/share/X11/fonts/cyrillic"
##      FontPath        "/usr/share/X11/fonts/100dpi/:unscaled"
##      FontPath        "/usr/share/X11/fonts/75dpi/:unscaled" 
##      FontPath        "/usr/share/X11/fonts/Type1"           
##      FontPath        "/usr/share/X11/fonts/100dpi"          
##      FontPath        "/usr/share/X11/fonts/75dpi"           
##      FontPath        "/usr/share/fonts/X11/misc"            
##      FontPath        "/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType"

Section "Module"
        Load    "i2c"
        Load    "bitmap"
        Load    "ddc"   
        Load    "dri"   # x - nvidia
#       Load    "drm"               
        Load    "dbe"               
        Load    "extmod"            
#       Load    "freetype"                                                                                                                                        
        Load    "glx"                                                                                                                                             
        Load    "int10"                                                                                                                                           
#       Load    "vbe"                                                                                                                                             
#       Load    "GLcore"        # x - nvidia                                                                                                                      

Section "InputDevice"
        Identifier      "Generic Keyboard"
        Driver          "kbd"             
        Option          "CoreKeyboard"    
        Option          "XkbRules"      "xorg"
        Option          "XkbModel"      "pc105"         # logicdit
        Option          "XkbLayout"     "pl"                      
        Option          "XkbOptions"    "terminate:ctrl_alt_bksp" 

Section "InputDevice"
        Identifier      "Configured Mouse"
        Driver          "mouse"           
        Option          "CorePointer"     
        Option          "Device"                "/dev/input/mice"
        Option          "Protocol"              "ImPS/2"        # ExplorerPS/2
        Option          "Emulate3Buttons"       "true"                        

Section "InputDevice"
        Identifier      "Synaptics Touchpad"
        Driver          "synaptics"         
        Option          "SendCoreEvents"        "true"
        Option          "Device"                "/dev/psaux"
        Option          "Protocol"              "auto-dev"  
        Option          "HorizScrollDelta"      "0"         

Section "ServerFlags"
        Option "DefaultServerLayout" "Single"
        Option "BlankTime" "4"                          # bylo 0
        Option "CycleTime" "0"                                  
        Option "OffTime" "5"                            # bylo 300
        Option "StandbyTime" "0"                        # Turn off screen after x minutes (DPMS)
        Option "SuspendTime" "0"                        # Full suspend after x minutes          
#       Option "AIGLX"  "true"                                                                  
#       Option "AllowNonLocalXvidtune"  "yes"                                                   
        Option "AllowEmptyInput" "off"                                                          
        Option "AutoAddDevices" "off"                                                           

Section "Device"
        Identifier      "Intel-945GM"
        Screen          0            
#       Driver          "i810"       
        Driver          "intel"      
        BusID           "PCI:0:2:0"  
        Option          "DDC" "off"  
        Option          "DRI" "true" 
        Option          "monitor-VGA"   "VGA"
        Option          "monitor-TV"    "TV" 
        Option          "monitor-LVCD"  "LVCD"
        Option          "XAANoOffscreenPixmaps" "true"
        Option          "DynamicTwinView" "False"     
        VideoRam        131072                        

Section "Monitor" 
       Identifier      "TV" 
       Option          "Ignore" "True" 

Section "Monitor"
        Identifier      "LVCD"
        Option          "DPMS"
        HorizSync       28-64 
        VertRefresh     43-60 

Section "Monitor"
        Identifier      "VGA"
        DisplaySize     550.08 343.8    # 0,2865 * 1920x1200
        HorizSync       30.0 - 81.0                         
        VertRefresh     56.0 - 75.0                         
        Option          "DPMS"                              

        # 1920x1200 @ 60.00 Hz (GTF) hsync: 74.52 kHz; pclk: 193.16 MHz
        Modeline "1920x1200_60.00"  193.16  1920 2048 2256 2592  1200 1201 1204 1242  -HSync +Vsync

        # 1920x1200 59.88 Hz (CVT 2.30MA) hsync: 74.56 kHz; pclk: 193.25 MHz - cvt
        Modeline "1920x1200_60.00a"  193.25  1920 2056 2256 2592  1200 1203 1209 1245 -hsync +vsync


Section "Screen"
        Identifier      "Screen0"
        Device          "Intel-945GM"
        Monitor         "LVCD"
        Option          "DisableGLXRootClipping" "true"
        DefaultDepth    24
        SubSection "Display"
                Depth           24
                Modes           "1280x800" "1920x1200" "1024x768" "800x600" "640x480"
#               Virtual         2048 2048
                Virtual         1920 2000

Section "ServerLayout"
        Identifier      "Single"
        Screen          0 "Screen0" 0 0
        InputDevice     "Generic Keyboard"
        InputDevice     "Configured Mouse"
        InputDevice     "Synaptics Touchpad"
        Option          "AIGLX" "true"

Section "DRI"
        Mode    0666

Section "Extensions"
        Option "Composite" "Enable"
xrandr output:
Screen 0: minimum 320 x 200, current 1920 x 2000, maximum 2048 x 2048
VGA connected 2195x1200+0+800 (normal left inverted right x axis y axis) 0mm x 0mm
   1920x1200_60.00a   59.9*
   1920x1200_60.00   60.0
   1600x1200      65.0     60.0
   1680x1050      69.9     60.0
   1600x1024      60.2
   1400x1050      74.8     70.0     60.0
   1280x1024      75.0     60.0
   1440x900       59.9
   1280x960       60.0
   1360x768       59.8
   1152x864       75.0     75.0     70.0     60.0
   1024x768       75.0     70.1     60.0
   832x624        74.6
   800x600        72.2     75.0     60.3     56.2
   640x480        72.8     75.0     59.9
LVDS connected 1280x800+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1280x800       60.0*+
   1024x768       85.0     75.0     70.1     60.0
   832x624        74.6
   800x600        85.1     72.2     75.0     60.3     56.2
   640x480        85.0     72.8     75.0     59.9
   720x400        85.0
   640x400        85.1
   640x350        85.1

I'm wondering why this command doesn't give the expected result:
xrandr --output LVDS --mode 1280x800 --pos 0x0 --output VGA --mode 1920x1200_60.00a --pos 0x800
After that the Samsung monitore (VGA) works in 1920x1200 mode but the desktop screen seems to be scaled (from 1920x1200 -> 1680x1200).

I solved it using the scale options:

xrandr --fb 1920x2000 --output LVDS --mode 1280x800 --pos 0x0 --output VGA --scale 1.143x1.0 --mode 1920x1200_60.00a --pos 0x800
I got the fallowing error as well: xrandr: specified screen 1920x2000 not large enough for output VGA (2195x1200+0+800)

but is there any other way? I don't want to scale screen size twice or even three times when I watch movies in e.g. HD ready resolution (1280x768).

Anyone can help? I'm using debian testing distribution.

Last edited by ruppertus; 10-21-2009 at 02:28 PM.


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