Bug#721749: xserver-xorg-video-r128: DVD playback very choppy on iMac G3 (model: M5521; R128 Ultra AGP 2x @ 16MB)
On Die, 2013-09-03 at 11:13 -0700, rkmugen wrote:
>
> Attempting to load any DVD movie into any DVD-capable media player results in
> very choppy video and audio playback and a very sluggish system until the
> program is either terminated or until the user clicks the stop button and waits
> for the DVD playback to stop.
[...]
> -Booting Debian Wheezy without an xorg.conf file always fails, so
> instead, I boot with the xorg.conf file detailed below. Note that I have
> "ForcePCIMode" enabled. If I were to set that to false (implying AGP mode),
> the system freezes, even at the system login screen (GDM).
Maybe try different values for Option "AGPMode", but I'm afraid it may
just not be stable.
> This makes me wonder if I'm getting the full AGP 2x speed out of my
> hardware, even with "ForcePCIMode" enabled, or if I am just getting
> the unaccelerated PCI bus speed.
You're getting the normal PCI bus speed.
> -When I examined the '/System/Library/Extensions' path in Mac OS X, I
> noticed that there were actually some additional files/drivers apart from the
> R128 driver that seemed to work in conjunction with the Rage128 driver to
> provide accelerated DVD performance. I could only speculate this by their
> filenames. I made a short post of it on the MintPPC forums
> (http://www.mintppc.org/forums/viewtopic.php?p=8147#p8147). Perhaps the
> current xserver-xorg-video-r128 driver has no provisions for DVD acceleration?
Indeed, there has never been such DVD playback hardware acceleration
support for Linux, so I'm afraid that DVD playback might push the limits
of your system even under otherwise ideal circumstances.
> [ 49.625] (**) R128(0): Option "BackingStore" "on"
> [ 49.626] (**) R128(0): Backing store enabled
This is generally a bad idea.
Does not enabling Option "DMAForXv" make any difference?
--
Earthling Michel Dänzer | http://www.amd.com
Libre software enthusiast | Debian, X and DRI developer
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