[Expired for linux (Ubuntu) because there has been no activity for 60
days.]
** Changed in: linux (Ubuntu)
Status: Incomplete => Expired
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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:
Expired
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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