mythbuntu-bugs team mailing list archive

[Alexander Schmidt <voidcastr@xxxxxxxxx>]

Created attachment 5681
HDMI power cycling patch

Created and attached a small patch that fixes the issue for me. It
applies to any xfce4-settings version starting from
dbd76eb58bd9d7a55de753daa5572ef24867d924 (contained in 4.11.1), up to
the current origin/master.

Can anybody confirm this patch fixing the issue while not introducing
undesirable side effects?

As I understand, it is indeed a suitable solution (cf. the
implementation in 641c6c4d7dda4ac41f811c8c0f9e26738f12a732 which used a
corresponding approach) but it might conceal another underlying problem:

g_ptr_array_unref(GPtrArray*) is expected to have the same effect as
g_ptr_array_free(GPtrArray*, TRUE) in case there is exactly one
reference to the given argument. However, in the case at hand, the
effects differ, which leads to the conclusion that there is more that
just one reference left to the given argument, prior to calling
g_ptr_array_unref. This could indicate some bug/leak -- but as I
understand, calling g_ptr_array_free with free_seg=TRUE deals with that
(somebody correct me if I'm wrong).

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https://bugs.launchpad.net/bugs/1308105

Title:
  Xfce resets TV mode to NULL when power cycled

Status in Mythbuntu, Ubuntu derivative focused upon MythTV:
  Confirmed
Status in xfce4-settings:
  Confirmed
Status in “nvidia-graphics-drivers” package in Ubuntu:
  Invalid
Status in “nvidia-graphics-drivers-331” package in Ubuntu:
  Invalid
Status in “xfce4-settings” package in Ubuntu:
  Confirmed

Bug description:
  I had an HTPC with Mythbuntu 12.04 installed.  Upon upgrading a new
  behavior that if the TV is power cycled it no longer detects a link
  with the HTPC.

  When this happens I can find in the xorg log that there is an
  accompanying log item:

  [ 39829.509] (II) NVIDIA(0): Setting mode "NULL"

  After debugging with NVIDIA at
  https://devtalk.nvidia.com/default/topic/729955/linux/tv-stops-being-
  detected/ we've deteremined it's a X client that reacts to the RANDR
  events causing the mode to be set to NULL.

  Working through the list in an Xfce environment, the culprit is
  xfsettingsd.  If xfsettingsd is running, it causes the TV to come up
  in a NULL mode.  If it's killed, it remains in the mode it was
  previously running in.

  
  Until this is fixed, this behavior can be worked around with a simple shell script:
  ==============================
  #!/bin/sh
  #Fix TV state when HDMI link is lost.
  #By Mario Limonciello <superm1@xxxxxxxxxx>

  OUTPUT="HDMI-0"
  BAD_MODE="1280x720"
  GOOD_MODE="1920x1080"

  for MODE in $BAD_MODE $GOOD_MODE; do
   DISPLAY=:0 xrandr --output $OUTPUT --mode $MODE
   sleep 2
  done
  ==============================

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