[Bug 28106] radeon KMS causes hardware conflict/interference with Intel wifi and audio, crashes wireless

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=28106

--- Comment #42 from Jason Porter <jasonporter at gmail.com> 2011-05-11 20:09:06 PDT ---
(In reply to comment #40)
> I never gave it much thought, but thinking about it, this seems suspicious to
> me as I am pretty sure that this device has only 64MB of VRAM.

I'm using an X1400 here, with 128MB of vram. I'm not sure if that is helpful or
not.

Here's some extra info for the fire, and one that surprised me when I
discovered it yesterday: there are a few apps that render fullscreen video that
do not exhibit the stuttering at all. This is new behavior, previously ANY
video would cause the stuttering when fullscreened.  This change that I'm
seeing may not be the same on your systems, but it's worth testing.

A good example is the Hulu Desktop for Linux application, which streams high
quality video fullscreen without any stutter.  This uses the video card, the
wifi connection, and the sound card at the same time, which is exactly the
situation that causes problems for most people.  The app specifies that it
requires Flash 10.0.32 or higher, which suggests that it uses Flash for the
video transport in some fashion.  The application can be downloaded from
http://www.hulu.com/labs/hulu-desktop-linux

Also, on my system, switching into HTML5 video mode on Youtube (using Google
Chrome) allows fullscreen 720p streaming without audio stutter.  The same video
played in standard Flash video mode (in Chrome or in Firefox) stutters heavily
when maximized, in both 480p and 720p formats.  In fact, any Flash-based
web-embedded video stutters when maximized, on any site that I've tried (Vimeo,
CBS, etc), including even Hulu's own web-based player.

I'm not sure what the story is on this, it's confusing. Maybe on my particular
hardware the radeon driver is able to cope differently with the particular
video rendering method used by Hulu Desktop and the browser HTML5 video
implementations. If the Hulu Desktop application is using Flash, it's doing it
differently than viewing the same video on Hulu.com in a browser, because the
web-embedded player stutters and the Hulu Desktop application doesn't, and both
are (theoretically) streaming from the same source.

I'm running very current versions of Mesa, Gallium and the radeon driver, so
the particular combination of behaviors that I'm seeing may be a recent change.
I also have a relatively fast system (Core 2 Duo with an SSD) and as always,
system load seems to have a big impact on this issue appearing or not.  So your
results may not be the same as mine.

possibly relevant information from glxinfo:
  direct rendering: Yes
  OpenGL vendor string: X.Org R300 Project
  OpenGL renderer string: Gallium 0.4 on ATI RV515
  OpenGL version string: 2.1 Mesa 7.11-devel

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