<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
On 2/6/2012 10:56 AM, william otten wrote:
<blockquote
cite="mid:CAHcDxgb-MYynWBGJBb1vosU84GEJko-yo4HGERxP9r=6vRJf2g@mail.gmail.com"
type="cite"><br>
<br>
<div class="gmail_quote">On Sat, Feb 4, 2012 at 8:58 AM, William
Otten <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:williammotten@gmail.com">williammotten@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
<div class="im"> On 2/3/2012 9:59 PM, william otten wrote: </div>
<div>
<div class="h5">
<blockquote type="cite"><br>
<br>
<div class="gmail_quote">On Fri, Feb 3, 2012 at 4:01
PM, Matt Garman <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:matthew.garman@gmail.com"
target="_blank">matthew.garman@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<p>Hi William,</p>
<p>The only way I know to verify the patch is in
place (other than by testing in myth using
opengl) is to look at the source. Look at that
function I mentioned in the earlier post, and
see if it includes the additional null pointer
check. Or, I suppose if you are already in
contact with the xorg devs, just ask them
directly.</p>
<p>I'm afraid I can't think of any other way to
check. Hope that helps!<span><font
color="#888888"><br>
Matt<br>
</font></span></p>
<div>
<div>
<div class="gmail_quote">On Feb 3, 2012 6:47
AM, "William Otten" <<a
moz-do-not-send="true"
href="mailto:williammotten@gmail.com"
target="_blank">williammotten@gmail.com</a>>
wrote:<br type="attribution">
<blockquote class="gmail_quote"
style="margin:0 0 0 .8ex;border-left:1px
#ccc solid;padding-left:1ex"> On 1/29/2012
7:34 PM, Matt Garman wrote:<br>
<blockquote class="gmail_quote"
style="margin:0 0 0 .8ex;border-left:1px
#ccc solid;padding-left:1ex"> On Sat,
Jan 28, 2012 at 01:55:31PM -0600,
william otten wrote:<br>
<blockquote class="gmail_quote"
style="margin:0 0 0
.8ex;border-left:1px #ccc
solid;padding-left:1ex"> The patch is
quite simple and involves one function
in<br>
mesa/drivers/dri/intel/intel_screen.c<br>
Another person on this list<br>
reported that the patch solved an
identical crash for him. Before<br>
diving into much debugging, I suggest
you apply this patch to the mesa<br>
7.11.2 code, recompile it, and give it
a test.<br>
</blockquote>
I may be the "other person" who has been
referred to several times<br>
in this thread, as I did exactly that: I
patched the intel_screen.c<br>
file and rebuilt mesa, and now have a
nicely working OpenGL-based<br>
SNB frontend (which I'm proud to say is
also quite small and<br>
low-power :).<br>
<br>
> From my skimming of this thread, it
looks like the individual with<br>
the patching issues is running Ubuntu.
I'm running CentOS plus<br>
ATrpms (for MythTV) and elrepo for newer
Intel video drivers and<br>
supporting packages (in particular,
mesa).<br>
<br>
What I did was simply download the
source RPM for mesa from elrepo,<br>
manually hack the intel_screen.c file
according to the patch, and<br>
rebuild. I don't know how to do this
with Ubuntu/debian packages,<br>
but I can't imagine the process is
dramatically different from an<br>
RPM-based distro.<br>
<br>
FWIW, the patch that has been mentioned
doesn't apply cleanly to the<br>
mesa source from elrepo, because it's a
slightly older version:<br>
looks like the mesa-20111103 snapshot.<br>
<br>
But the patch is super simple. Just
look for the function<br>
"intelDRI2Flush()" in the file mentioned
above. It should be near<br>
the top of the file. Just replace that
function definition with<br>
this one:<br>
<br>
static void<br>
intelDRI2Flush(__DRIdrawable *drawable)<br>
{<br>
GET_CURRENT_CONTEXT(ctx);<br>
struct intel_context *intel =
intel_context(ctx);<br>
<br>
if (intel != NULL) { /* add this...
*/<br>
if (intel->gen< 4)<br>
INTEL_FIREVERTICES(intel);<br>
<br>
intel->need_throttle =
GL_TRUE;<br>
<br>
if (intel->batch.used)<br>
intel_batchbuffer_flush(intel);<br>
} /* ...and this */<br>
}<br>
<br>
As I commented above, the patch just
adds two lines, which just do a<br>
NULL pointer safety check.<br>
<br>
So, generic instructions would be:<br>
<br>
- get your distro's newest mesa
source package<br>
- unpack it (e.g. RPMs are really
cpio archives)<br>
- track down the intel_screen.c file
and patch (or manually<br>
edit) it as described above<br>
- re-package the mesa source package<br>
- use your distro's source package
build tool to build a binary<br>
package (e.g. rpmrebuild for
RPM-based distros)<br>
<br>
Working with your distro's source
packages should be well-documented<br>
(at least for major distros like Ubuntu
and Fedora).<br>
<br>
The other option is to wait: I also
reported my success with this on<br>
the elrepo mailing list. The elrepo
mesa maintainer said he didn't<br>
want to update the package with a patch
that wasn't committed<br>
(according to this thread, it is now,
but wasn't when I made the<br>
comment). So I would imagine that
package maintainers will probably<br>
be open to incorporating this patch into
their builds now that it's<br>
officially committed... I might request
it for elrepo if I get<br>
around to it.<br>
<br>
In other words, with this patch
officially committed, it will<br>
eventually make its way into different
distro's mesa builds.<br>
<br>
HTH,<br>
Matt<br>
<br>
_______________________________________________<br>
mythtv-users mailing list<br>
<a moz-do-not-send="true"
href="mailto:mythtv-users@mythtv.org"
target="_blank">mythtv-users@mythtv.org</a><br>
<a moz-do-not-send="true"
href="http://www.mythtv.org/mailman/listinfo/mythtv-users"
target="_blank">http://www.mythtv.org/mailman/listinfo/mythtv-users</a><br>
</blockquote>
Matt<br>
I appreciate your input on this issue. Not
being a programmer, I can't get my brain
wrapped around all that needs to be
considered or done to test this patch.
With that said, I have setup with
xorg-edgers in anticipation that the patch
will work it's way down stream. I
contacted one of the dev's at xorg-edgers
and he replied that the patch should be
available within a week or two ( that was
about a week ago). I have since received a
couple of updates from them but I'm not
sure if the patch was included. Is there a
way to check (other than just trying vaapi
with mythtv) to see if the patch is
included or has been received by me?<br>
Thanks<br>
William<br>
</blockquote>
</div>
</div>
</div>
</blockquote>
</div>
I'm a fish out of water here. I tried to find the
source on the xorg-edgers site for over an hour but no
luck. The only thing I found was this:<br>
<br>
<a moz-do-not-send="true"
href="http://bazaar.launchpad.net/%7Evcs-imports/mesa/master/revision/26908"
target="_blank">http://bazaar.launchpad.net/~vcs-imports/mesa/master/revision/26908</a><br>
<br>
The other url doesn't work anymore. Also I sent an
email to one of the dev's. <br>
<fieldset></fieldset>
<br>
<pre>_______________________________________________
mythtv-users mailing list
<a moz-do-not-send="true" href="mailto:mythtv-users@mythtv.org" target="_blank">mythtv-users@mythtv.org</a>
<a moz-do-not-send="true" href="http://www.mythtv.org/mailman/listinfo/mythtv-users" target="_blank">http://www.mythtv.org/mailman/listinfo/mythtv-users</a>
</pre>
</blockquote>
</div>
</div>
<div class="im"> I tried the opengl option for render and
osd render and it works with ffmpeg. So the patch must be
working. I will try to use debug again with vaapi and see
if i can get errors to post since the vaapi decoder option
still isn't working.<br>
</div>
</div>
</blockquote>
</div>
This the latest debug using the latest master:<br>
<br>
gdb.txt<br>
<br>
<a moz-do-not-send="true"
href="http://dl.dropbox.com/u/17574275/gdb%202-6-12.txt">http://dl.dropbox.com/u/17574275/gdb%202-6-12.txt</a><br>
<br>
myth.log<br>
<br>
<a moz-do-not-send="true"
href="http://dl.dropbox.com/u/17574275/myth%202-6-12.log">http://dl.dropbox.com/u/17574275/myth%202-6-12.log</a><br>
<br>
terminal capture<br>
<br>
<a moz-do-not-send="true"
href="http://dl.dropbox.com/u/17574275/MythtvBacktrace%202-6-12">http://dl.dropbox.com/u/17574275/MythtvBacktrace%202-6-12</a><br>
<br>
I also changed from ubuntu 11.10 to 12.4. A side note, mythtv
plays without tearing using ffmpeg and opengl with unity.<br>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
mythtv-users mailing list
<a class="moz-txt-link-abbreviated" href="mailto:mythtv-users@mythtv.org">mythtv-users@mythtv.org</a>
<a class="moz-txt-link-freetext" href="http://www.mythtv.org/mailman/listinfo/mythtv-users">http://www.mythtv.org/mailman/listinfo/mythtv-users</a>
</pre>
</blockquote>
This statement keeps repeating in the command line but not showing
up in <br>
gdb.txt or myth.log:<br>
intel_do_flush_locked failed: Input/output error<br>
</body>
</html>