linux-traipu team mailing list archive

[Anna Thomas <1308105@xxxxxxxxxxxxxxxxxx>]

Running Xubuntu 16.04.1 with all updates applied as of 31/01/17 this bug
affected me when using the HDMI port of a Braswell chipset Shuttle
XS36V5. When resuming my Samsung TV from standby the HDMI wouldn't wake
up and thus no picture. It was the only display device attached. Tried
various combinations of power management settings in UEFI/XFCE/TV to no
avail, as well as a different HDMI port on TV as well as different HDMI.

Upon a 'sudo reboot' from SSH or by pressing the power button on the
shuttle (had power button set to 'shutdown' instead of 'ask') the TV
would wake up within a second or two and show the shutting down logo.

Consulted your Freenode IRC channel, Flocculant suggested applying:

https://launchpadlibrarian.net/269857837/xfce4-settings_4.12.0-3ubuntu1_amd64.deb

Which i did with 'dpkg -i xfce4-settings_4.12.0-3ubuntu1_amd64.deb &&
apt-get install -f' and this fixed it. Petition to get this fix applied
to a SRU for 16.04 thanks <3

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AL - BR, which is subscribed to Mythbuntu.
https://bugs.launchpad.net/bugs/1308105

Title:
  Xfce resets TV mode to NULL when power cycled

Status in Mythbuntu:
  Confirmed
Status in xfce4-settings:
  Fix Released
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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