[Bug 85974] New: system hangs on xv ports exceeded

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85974

            Bug ID: 85974
           Summary: system hangs on xv ports exceeded
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: lists at svrinformatica.it
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

xorg 1.16.1
xf86-video-intel 2.99.916
kernel 3.17.2

lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor
Integrated Graphics Controller (rev 06)

xvinfo 
X-Video Extension version 2.2
screen #0
  Adaptor #0: "Intel(R) Textured Video"
    number of ports: 16

so I can have at most 16 xvideo ports

with 16 xvideo ports active if I request another one (using for example a
gstreamer pipeline or with vlc) the system hangs. I have no trace in dmesg.

I'm sure that with older chip (gen2) and with older drivers I simply get an
error message saying that a new xvideo window cannot be open. This seems better
than a system hangs :-)

Can I ask why there is such limit about xvideo ports? On my hw I can use a
gstreamer app that open 16 xvideo windows (xvimagesink) with 16 full hd video
(I send 1920x1080 yuv frame to 16 concurrent xvimagesink gstreamer plugin) but
I cannot open 17 xvideo windows showing 160x120 videos. What is the rationale
behind this?

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