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[amichair <1579579@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

On Kubuntu 16.04 with kernel 4.4.0-22.39-generic 4.4.8, but it's been
like this since 15.10 a few kernels back. Multiple screens connected.
Intel i7 4771 Haswell with only integrated GPU (no dedicated graphics
card).

What happens is that the monitors do enter energy saving mode at the
configured timeout of user inactivity, but a couple seconds later they
snap right out of it. Usually when I come back to my computer after
being away there are also a few Plasma crash dialogs. My monitors
haven't been saving energy (or pixel life) in over half a year now.

The only evidence I found in the system log, which I'm not sure is
related but might be worth mentioning, is:

[Mon May  9 00:29:03 2016] snd_hda_codec_hdmi hdaudioC0D0: HDMI: ELD buf size is 0, force 128
[Mon May  9 00:29:03 2016] snd_hda_codec_hdmi hdaudioC0D0: HDMI: invalid ELD data byte 0

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1579579

Title:
  Monitors immediately come out of energy saving mode

Status in linux package in Ubuntu:
  New

Bug description:
  On Kubuntu 16.04 with kernel 4.4.0-22.39-generic 4.4.8, but it's been
  like this since 15.10 a few kernels back. Multiple screens connected.
  Intel i7 4771 Haswell with only integrated GPU (no dedicated graphics
  card).

  What happens is that the monitors do enter energy saving mode at the
  configured timeout of user inactivity, but a couple seconds later they
  snap right out of it. Usually when I come back to my computer after
  being away there are also a few Plasma crash dialogs. My monitors
  haven't been saving energy (or pixel life) in over half a year now.

  The only evidence I found in the system log, which I'm not sure is
  related but might be worth mentioning, is:

  [Mon May  9 00:29:03 2016] snd_hda_codec_hdmi hdaudioC0D0: HDMI: ELD buf size is 0, force 128
  [Mon May  9 00:29:03 2016] snd_hda_codec_hdmi hdaudioC0D0: HDMI: invalid ELD data byte 0

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