[ltp] Switching video output on a T23

[Alex Deucher]

On Fri, Jun 27, 2008 at 9:31 AM, Hannes Kuhnert
<hannes@froschmaschine.net> wrote:
> In the past I could get LCD and VGA switched on simultaneously on a T23, at
> least at one with XGA display. (I own one with SXGA+ display). I did that via
> the /proc interface of the ibm-acpi linux kernel modul.
>

You can't use the bios to set up VGA + LCD on the models.  The bios
won't allow it.
It drives both outputs with the same crtc, hence they both get the
same timings.  IIRC, the SXGA+ panel mode runs at 50hz, which would be
awful on the VGA port.

Alex