Laptop external monitor problem

[Alex Deucher]

On Dec 21, 2007 4:18 AM, Paul Morarescu <paul.morarescu at gmail.com> wrote:
> On Dec 16, 2007 1:19 PM, Alex Deucher <alexdeucher at gmail.com> wrote:
> > On Dec 15, 2007 1:52 PM, Paul Morarescu <paul.morarescu at gmail.com> wrote:
> > > Hello,
> > >
> > > The newer driver versions seem to work better for me, but the only
> > > resolution I can get on my external 22" wide LCD is 1024x768. This is
> > > exactly the same as the native resolution of the LVDS screen. In fact,
> > > you will see below that xrandr behaves as if it drives both the LVDS
> > > and the VGA-0 ports in the same way. I need help to get the external
> > > monitor working at the optimum resolution of 1680x1050x60
> >
> > For whatever reason, the driver is not able to get an edid from the
> > monitor, so it doesn't know what modes the monitor supports, hence it
> > ends up with the default monitor ranges which means 1024x768 at 60.
> >
> > >
> > > Section "Monitor"
> > >         Identifier "LVDS-display"
> > > EndSection
> > >
> > > Section "Monitor"
> > >         Identifier      "ProView"
> > >         HorizSync       30.0-81.0
> > >         VertRefresh     55.0-77.0
> > > EndSection
> > >
> > > Section "Device"
> > >         Identifier  "Videocard0"
> > >         Driver      "radeon"
> > >         #Option     "DefaultConnectorTable" "on"
> > >         #Option      "ConnectorTable" "5,2,2,1,3,1,0,2"
> > >         #Option "ReverseDDC" "true"
> > >         Option      "LVDS"   "LVDS-display"
> > >         Option      "VGA-0"  "ProView"
> > > EndSection
> >
> > The above options are wrong.  They should be:
> >          Option      "monitor-LVDS"   "LVDS-display"
> >          Option      "monitor-VGA-0"  "ProView"
> >
> > See this page for more on randr 1.2 xorg configuration.  If you want
> > 1680x1050 on the external monitor, you'll have to set that as the
> > preferred mode in your "ProView" monitor section.
> > http://www.intellinuxgraphics.com/dualhead.html
> >
> > Alex
> >
>
> OK I did that.
> Now the external monitor won't turn on at all.
> Also upgraded the xorg-ati driver yesterday to the latest release.
>
> Note that although I specify a target refresh of 60.0, xrandr reports
> 69.9 as the default.
> Also note that I just want the clone mode.

does
xrandr --output VGA-0 --mode 1680x1050  --rate 60
help?

the mode line you probably want is (reduced blanking for LCD:
Modeline "1680x1050R"  119.00  1680 1728 1760 1840  1050 1053 1059
1080 +hsync -vsync
Option          "PreferredMode"  "1680x1050R"
does this help?


Alex