[Xorg-driver-geode] 1024x600px panel support on Geode LX-800

[Otavio Salvador]

Hello,

Disable serial ports and test.  The chipset multiplexes the GPIO and
the serial 1 so it might affect the EDID information.

On Mon, Sep 21, 2009 at 9:44 AM, Dawid Nogens <dawid.nogens at vehco.se> wrote:
> Hello,
>
> I'm trying to get a Geode LX-800 based panel PC running with xorg. The panel
> PC is equipped with a 1024x600 flat screen that is connected to an onboard TFT
> panel connector.
> Unfortunatly the README to the xserver-xorg-video-geode driver tells WXGA
> resolutions only can be used when TFT support is disabled in the BIOS.
>
> I've currently installed Ubuntu Netbook Remix based on Ubuntu 9.04 jaunty.
>  - Kernel 2.6.28.11. Custom kernel, based on standard generic x86 kernel, but
> disabled EDID-support.
>  - xorg 1.6.3-1ubuntu6
>  - xserver-xorg-video-geode 2.11.4 compiled for 1.6.3
> In the BIOS the flat panel is configured with a resolution of 1024x600 @ 60Hz.
>
> The situation is as follows:
> To get Linux running on the panel PC, it had to be installed using another
> system and then a custom kernel with disabled EDID support had to be compiled.
> The system comes up with a resolution of 1024x768 which perfectly fits the
> physical resolution of the screen, but with an area of 168 px missing at the
> bottom.
>
> Manually adding a 1024x600 mode using xrandr and configuring xorg to use that
> resolution results in a virtual desktop of 1024x600 px which is scaled up to
> fit a 1024x768 screen. So again, an area at the bottom of the virtual screen is
> missing and this time the resolution doesn't fit the screens physical
> resolution.
>
> Playing around with the "gnome display preferences" i stumbled about
> something. Starting up xorg with a resolution of 1024x600 (which in fact is
> scaled up to 1024x768) and then using "gnome display preferences" to change
> the resolution to 1024x768 had the following effect:
> First the resolution is changed to 1024x768, but the virtual desktop's size
> remains 1024x600. That state is displaying exactly what I want. The display's
> resolution fits the physical resolution of the screen and the virtual desktop
> fits the area the screen is able to show. After that, "gnome display
> preferences" detects that the resolution used is bigger than the virtual
> desktop and adjusts the virtual desktop to the selected resolution of
> 1024x768.
>
> Now to the questions I have:
> - Is it possible to add support for a WSVGA display that is connected to the
> onboard TFT interface to the driver?
> - What is needed to do that? Is it just enough to add the appropriate mode for
> 1024x600 to lx_panel_modes[] in "lx_panel.c", or does it demand extensive
> changes?
>
> - If there isn't any way to add support for a WSVGA display, is it then
> possible to use the 1024x768 resolution but tell the xserver it only has a
> virtual screen of 1024x600? That would be dirty, but may eventually work as
> that complies to the situation described when switching from 1024x600 to
> 1024x768 using the "gnome display preferences".
>
> Do you have any hints how I could solve my problem?
>
> Regards,
> Dawid Nogens
> _______________________________________________
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> Xorg-driver-geode at lists.x.org
> http://lists.x.org/mailman/listinfo/xorg-driver-geode
>



-- 
Otavio Salvador                  O.S. Systems
E-mail: otavio at ossystems.com.br  http://www.ossystems.com.br
Mobile: +55 53 9981-7854         http://projetos.ossystems.com.br