Re: Re: Compaq Presario 2800T

Charl P. Botha
2002-08-07T23:05:02Z

On Wed, Aug 07, 2002 at 06:57:25PM -0400, Sourav K Mandal wrote:
> > The Fn f7 (dim) and Fn-f8 (brighten) and Fn-F4 (monitor) all work fine
> > when I first boot up. They also work fine if I start X with no DRM. If
> > I start X with drm, then they stop working and won't work again until
> > I reboot.
>
> Exactly what I'm getting, but with stock DRI modules.

Just for clarity, on my laptop (which is not a Compaq, but a no-namer with
Radeon Mobility 7500 64MB) the bright/dim keys always work, DRI or no DRI.

> > Any ideas? Could be a XFree86 version problem?
>
> Unforunately, not really. :-(
>
> My (layman's) guess is that it has something to do with the GPU's
> power state. The BIOS won't shut down the LCD until it's
> satisfied with the Radeon's power state; once DRM is used
> the Radeon cannot enter an acceptable power state.

If you experience this with stock XFree86 DRI as well, I would post a report
on xpert-72qDnkntNoRAfugRpC6u6w@public.gmane.org as well. One of the ATI engineers is spending a lot of
time with these drivers and might have something to add to the equation.

> This is the inverse of the DRI-on-resume problem, that once
> the Radeon is shutdown w/o reset, the DRM "parts" don't
> wake up properoly.

The DRM wasn't designed for stopping/starting in mid-stride, which is why
we've made it so that it completely initialises/de-initialises during
VT-switch. If certain remaining technical problems can be sorted out, this
might even make XFree86 4.3.0, at least until a more generic solution can be
implemented.

Good luck,
Charl

--
charl p. botha http://cpbotha.net/ http://visualisation.tudelft.nl/