[Bug 75729] New: Haswell: Muting S/PDIF turns off DP

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75729

          Priority: medium
            Bug ID: 75729
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: Haswell: Muting S/PDIF turns off DP
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: consume.noise at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 95061
  --> https://bugs.freedesktop.org/attachment.cgi?id=95061&action=edit
dmesg 3.13.4 (stock Arch kernel, booted with drm.debug=0xe)

This time it's not a bug with a ThinkPad nor a docking station involved, even
no laptop at all. But, again it's some DP vs. audio "issue".

I have just set up my new desktop at home. It's a Haswell i7-4770 sitting on a
Intel DH87RL board. A monitor (iiyama 27") is connected via DP. This monitor
has a massive sound system of 2x2W speakers build in, which I tested (this bug
report doesn't cover the audio quality).

So, the audio output via DP to the monitor played and I just tested to mute the
S/PDIF via alsamixer ... and the monitor turned off into standby, audio stoped.
Blindly typing another 'm' to unmute the S/PDIF and the monitor turned back on
and the audio playback proceeded.

If I don't play audio and mute the S/PDIF, the monitor stays active/on. Until I
start playing audio.


I've attached a dmesg log (drm.debug=0xe) of a boot to the console, where I
have played audio and muted the S/PDIF. Though, the log doesn't show anything
after the login. There's a "[drm:ivb_err_int_handler], Pipe A FIFO underrun" at
the end, but I don't think (...famous noob words) that this is related because
I've "turned off" the monitor via muting during this boot a couple of times and
this message doesn't show up.


How can provide any useful debug logs for this issue? (I guess: build a kernel
with alsa-debug options?)

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
You are on the CC list for the bug.
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20140303/1ea16b73/attachment.html>