[mythtv-users] MythTV experience with Intel Sandy Bridge graphics
Matt Garman
matthew.garman at gmail.com
Mon Jan 16 01:35:20 UTC 2012
On Sun, Jan 15, 2012 at 04:49:12PM -0600, Keith Pyle wrote:
> There has been frequent discussion about the state of Intel graphics
> and their Sandy Bridge chip capabilities, so I wanted to share our
> recent experiences. Here's the hardware and software being used for
> the MythTV front-end system.
I am working on a similar system. Here are my specs:
CPU: Intel i3-2100 (dual core 3.1 GHz)
MB: Asrock H67M-ITX
Memory: 4 GB
Drive: Kingston SSD
OS: CentOS 6.1, kernel-ml 2.6.39-4.1 (elrepo-kernel)
Video drivers
3D driver: mesa 7.11-12.1 (elrepo-testing)
2D driver: xf86-video-intel 2.17.0-1 (elrepo-testing)
libdrm: libdrm-2.4.27-1 (elrepo-testing)
MythTV Version : v0.24.1-106-g31e9528
MythTV Branch : fixes/0.24
Network Protocol : 63
Library API : 0.24.20110505-1
QT Version : 4.7.2
Display: Panasonic tc-p65v10 (plasma)
> Myth experience: We started with the CPU++ standard playback
> profile (ffmpeg & Xvideo). There was a noticeable horizontal tear
> about half way down the screen, most apparent during vertical
> panning of a scene. This wasn't surprising given prior reports of
> similar problems.
I have very slight horizontal tearing across the top 1/10th of my
screen. It's not constant; exists in some scenes, and not in
others. I can *almost* ignore it.
I tried enabling the XvPreferOverlay setting in xorg.conf that was
suggested here; that had no effect. Same goes for the
i915.powersave=0 module param that I read about somewhere else.
> We tried switching to ffmpeg & opengl, but Myth would crash on
> starting any playback. A bit of debugging identified a
> null-pointer dereference in the mesa video driver, which we
> reported to freedesktop.org. They fairly quickly posted a
> proposed (simple) patch which we have now incorporated. With the
> patch, playback works *very* well with ffmpeg & opengl. While I'm
Do you happen to have a link to that patch? Or if it's small enough
can you post it? I too have the "crash when using opengl" issue.
> Power profile: At idle on the X desktop, the system pulls 31.2
> watts, as measured by a Kill-a-Watt meter. With all 4 cores
> spinning at 100%, the load is 66.1 watts. Playing a video via
> mythfrontend draws 34.4.
This is why I'm really interested in getting a Sandy Bridge-based
FE going. I underclocked my memory from 1333 to 1066 and
undervolted it to 1.325 Volts. With a PicoPSU my idle system pulls
about 18 Watts (also measured with a Kill-a-Watt). Watching videos
puts me in the 25--30 Watt range (depending on the video).
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