Re: Re: Compaq Presario 2800T

[Kevin Fenzi <kevin-acpi-+bl/7iUgRMUAvxtiuMwx3w@public.gmane.org>]

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>>>>> "Charl" == Charl P Botha <c.p.botha-ra0OqMccq8edIhEUFHOBvg@public.gmane.org> writes:

Charl> On Wed, Aug 07, 2002 at 06:57:25PM -0400, Sourav K Mandal
Charl> 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.

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

so it might be a bios diffrence... ?

>> 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.

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

ok. I will try and test it later tonight and see. I can't remember if
I saw it with stock X/drm or not. 

>> 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.

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

excellent. 

Charl> Good luck, Charl

kevin


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