Wrong resolution and refresh on second screen

[Alex Deucher]

On Sun, May 25, 2008 at 8:44 AM,  <sfrdll at tiscali.it> wrote:
> Hi all,
> I know that his topic as been discussed thousand times, but this is my
> first time in xorg configuration and I hardly understand old discussions.
>
> I have an ASUS laptop with ATI Radeon Mobility 7500, and 1400x1050 LCD screen.
> A few days ago I plugged and external Acer 1680x1050 LCD screen, but it only
> works at 1440x900 75Hz, I cannot get it working at 1680x1050 60Hz.
>
> I think it is due to wrong xorg.conf.
>
> Can anyone please help me? Thanks a lot.

the default fb size is not large enough for a 1680x1050 screen.
you'll need to add a virtual line to the display subection of the
display section of your xorg.conf (see below).

>
> Sergio
>
> Here are my xorg.conf and Xorg.0.log:
>
> ------------------------------------------------------------------------------------------------------------------
>
> # 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 "ServerLayout"
>        Identifier     "Default Layout"
>        Screen         0 "ScreenAsus" 0 0
>        Screen         1 "ScreenAcer" RightOf "ScreenAsus"
>        InputDevice    "Generic Keyboard"
>        InputDevice    "Configured Mouse"
>        InputDevice    "Synaptics Touchpad"
> EndSection
>
> Section "Files"
> EndSection
>
> Section "Module"
> EndSection
>
> Section "InputDevice"
>        Identifier  "Generic Keyboard"
>        Driver      "kbd"
>        Option      "CoreKeyboard"
>        Option      "XkbRules" "xorg"
>        Option      "XkbModel" "pc105"
>        Option      "XkbLayout" "it"
> EndSection
>
> Section "InputDevice"
>        Identifier  "Configured Mouse"
>        Driver      "mouse"
>        Option      "CorePointer"
>        Option      "Device" "/dev/input/mice"
>        Option      "Protocol" "ImPS/2"
>        Option      "Emulate3Buttons" "true"
> EndSection
>
> Section "InputDevice"
>        Identifier  "Synaptics Touchpad"
>        Driver      "synaptics"
>        Option      "SendCoreEvents" "true"
>        Option      "Device" "/dev/psaux"
>        Option      "Protocol" "auto-dev"
>        Option      "HorizScrollDelta" "0"
> EndSection
>
> Section "Monitor"
>        Identifier   "MonitorAsus"
>        HorizSync    60.0 - 75.0
>        VertRefresh  60.0 - 75.0
>        Option       "DPMS"
> EndSection
>
> Section "Monitor"
>        Identifier   "MonitorAcer"
>        HorizSync    60.0 - 75.0
>        VertRefresh  60.0 - 75.0
>        Option       "DPMS"
> EndSection
>
> Section "Device"
>        Identifier  "RadeonAsus"
>        Driver      "ati"
>        BusID       "PCI:1:0:0"
>        Screen      0 # "ScreenAsus"
> EndSection
>
> Section "Device"
>        Identifier  "RadeonAcer"
>        Driver      "ati"
>        BusID       "PCI:1:0:0"
>        Screen      1 # "ScreenAcer"
> EndSection
>
> Section "Screen"
>        Identifier  "ScreenAsus"
>        Device      "RadeonAsus"
>        Monitor     "MonitorAsus"
>        DefaultDepth     24
>        SubSection "Display"
>                Depth     24
>                Modes    "1400x1050"
>        EndSubSection
> EndSection
>
> Section "Screen"
>        Identifier  "ScreenAcer"
>        Device      "RadeonAcer"
>        Monitor     "MonitorAsus"
>        DefaultDepth     24
>        SubSection "Display"

                  Virtual 1680 1050

>                Depth     24
>                Modes     "1680x1050"
>        EndSubSection
> EndSection
>

Alex