[mythtv-users] Can't adjust contrast, brightness etc in Mythtv .20

[Daniel Kristjansson]

On Tue, 2007-01-16 at 16:18 -0800, Robert Tsai wrote:
> On Tue, Jan 16, 2007 at 04:16:38PM -0800, Robert Tsai wrote:
> > On Tue, Jan 16, 2007 at 06:07:04PM -0600, Randy Ferrill wrote:
> > > When I hit the F key and try to adjust birghtness , contrast , etc
> > > it changes to a -1 and won't change.
> > > 
> > > PVR-250 and Nvidia Geforce 4MX card, FC5 and Mythtv .20.
> > > 
> > > I searched the archive and found 1 posting but no answer or replies
> > 
> > I see the same thing. A few weeks ago I traced this problem down to a
> > failure in VideoOutputXv::SetPictureAttribute; one of the X or Xv
> > calls is failing.
> > 
> > The caller TV::DoChangePictureAttribute does not check for the
> > sentinel "-1" return value; hence you see "-1" in your OSD.
> > 
> > I don't know why the X/Xv calls are failing. Too many things have
> > happened since this was last working (distro/X.org upgrade, kernel
> > upgrade, NVidia driver upgrade, etc.).
> 
> If it matters:
> 
> - AMD64
> - NVidia FX5200, v9746 (also with a few prior versions)
> - Linux 2.6.19.2 (also with 2.6.16.9)
> - Ubuntu Edgy Eft
> 
> I think things were working with Dapper Drake.

The latest nVidia drivers default to not supporting XVideo
picture attributes. You need to add this is the appropriate
place in your xorg.conf:

    Option "XvmcUsesTextures" "false"

This will also increase performance on the FX5000 series
and earlier cards.

-- Daniel