Mailinglist Archive: radeonhd (427 mails)

[Christiaan van Dijk <dvbmail@xxxxxxxxx>]

Tristan Hoffmann wrote:
> Christiaan van Dijk wrote:
>   
> > Christian König wrote:
> >     
> > > Since the audio pipeline from application->alsa->audio codec->hdm
<snip>
> > I'm very puzzled by this behavior but will try to think of some new
> > experiments.
> >
> > Regds,
> > Christiaan.
> >     
> I'm not sure, but I think these audio dropouts might not be directly
> related to the driver. I have an RS690 system and it's simply not
> powerful enough to play FullHD videos, the playback isn't smooth and I
> also have dropouts using the normal headphone output.
>
>   
This is an interesting point. I got my RS690 board for use in a HTPC,
checked out the specifications and commercial blatter and all seemed
fine. Driver support from supplier and from open-source, what more can
you wish for?
After fighting this system now for a couple of months I have to come to
the following conclusions:

* Supplier Linux driver is not usable on a full-HD setup with a recent
kernel.
* Full-HD X264 decompression is (easily) possible on a 4850e processor
with coreavc-for-linux (it's not free but very good cost/performance ratio).
* Great work is being done on the open source drivers but for a full-HD
setup you really have to use every bit of the graphics processor as
efficient as possible. The drivers are not yet doing this which results
in just not sufficient performance. I did not realize how much data
actually needs to be processed for a full-HD frame in the available
time, if you calculate the numbers it's pretty amazing what the graphics
processor can do but right now it can barely handle 25 frames per second.
* I did personally not expect so many problems and complications to get
tear-free video. Right now I'm running a very crude patch which uses
double buffering by using the hardware overlay functions but this is far
from optimal at the moment.
* Critical features for a HTPC like full HDMI support are still in
development, great work is being done here but it is not yet
usable/stable enough for daily use.

These are my personal findings, use them for what you think it's worth.
My board has also been showing some other quirks which I did not look
into yet, at the moment I am considering switching to an Intel based
GM45 board like the MSI IM-GM45. Problem is the same as with the AMD
board; you will only find out if the board can handle full-HD once
you've got the whole setup up and running. Any user experiences on this
point would be welcome.

If you use the RS690 in lower resolutions performance is actually quite
good, full-HD is just pushing it a bit too far.

Regds,
Christiaan.

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