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[Bug 1483209] [NEW] unity8 polling clock continually while display blanked

To: touch-packages@xxxxxxxxxxxxxxxxxxx
From: Gerry Boland <1483209@xxxxxxxxxxxxxxxxxx>
Date: Mon, 10 Aug 2015 11:02:15 -0000
Reply-to: Bug 1483209 <1483209@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Public bug reported:

With phone screen off, do:

sudo strace -p `pidof unity8`

and observe continual messages like:

poll([{fd=3, events=POLLIN}, {fd=47, events=POLLIN}, {fd=48, events=POLLIN}, {fd=56, events=POLLIN}, {fd=59, events=POLLIN}, {fd=66, events=POLLIN}, {fd=67, events=POLLIN}, {fd=72, events=POLLIN}, {fd=84, events=POLLIN}, {fd=92, events=POLLIN}, {fd=97, events=POLLIN}], 11, 0) = 1 ([{fd=3, revents=POLLIN}])
clock_gettime(CLOCK_MONOTONIC, {1354, 62463620}) = 0
poll([{fd=3, events=POLLIN}, {fd=47, events=POLLIN}, {fd=48, events=POLLIN}, {fd=56, events=POLLIN}, {fd=59, events=POLLIN}, {fd=66, events=POLLIN}, {fd=67, events=POLLIN}, {fd=72, events=POLLIN}, {fd=84, events=POLLIN}, {fd=92, events=POLLIN}, {fd=97, events=POLLIN}], 11, 138) = 1 ([{fd=3, revents=POLLIN}])
read(3, "\1\0\0\0\0\0\0\0", 16)         = 8
clock_gettime(CLOCK_MONOTONIC, {1354, 67163758}) = 0
clock_gettime(CLOCK_MONOTONIC, {1354, 68720297}) = 0
poll([{fd=3, events=POLLIN}, {fd=47, events=POLLIN}, {fd=48, events=POLLIN}, {fd=56, events=POLLIN}, {fd=59, events=POLLIN}, {fd=66, events=POLLIN}, {fd=67, events=POLLIN}, {fd=72, events=POLLIN}, {fd=84, events=POLLIN}, {fd=92, events=POLLIN}, {fd=97, events=POLLIN}], 11, 132) = 1 ([{fd=3, revents=POLLIN}])
read(3, "\1\0\0\0\0\0\0\0", 16)         = 8
clock_gettime(CLOCK_MONOTONIC, {1354, 75648421}) = 0
clock_gettime(CLOCK_MONOTONIC, {1354, 77449123}) = 0
poll([{fd=3, events=POLLIN}, {fd=47, events=POLLIN}, {fd=48, events=POLLIN}, {fd=56, events=POLLIN}, {fd=59, events=POLLIN}, {fd=66, events=POLLIN}, {fd=67, events=POLLIN}, {fd=72, events=POLLIN}, {fd=84, events=POLLIN}, {fd=92, events=POLLIN}, {fd=97, events=POLLIN}], 11, 123) = 0 (Timeout)

It appears to be continually polling the clock, which is a waste of
cycles.

** Affects: unity8 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1483209

Title:
  unity8 polling clock continually while display blanked

Status in unity8 package in Ubuntu:
  New

Bug description:
  With phone screen off, do:

  sudo strace -p `pidof unity8`

  and observe continual messages like:

  poll([{fd=3, events=POLLIN}, {fd=47, events=POLLIN}, {fd=48, events=POLLIN}, {fd=56, events=POLLIN}, {fd=59, events=POLLIN}, {fd=66, events=POLLIN}, {fd=67, events=POLLIN}, {fd=72, events=POLLIN}, {fd=84, events=POLLIN}, {fd=92, events=POLLIN}, {fd=97, events=POLLIN}], 11, 0) = 1 ([{fd=3, revents=POLLIN}])
  clock_gettime(CLOCK_MONOTONIC, {1354, 62463620}) = 0
  poll([{fd=3, events=POLLIN}, {fd=47, events=POLLIN}, {fd=48, events=POLLIN}, {fd=56, events=POLLIN}, {fd=59, events=POLLIN}, {fd=66, events=POLLIN}, {fd=67, events=POLLIN}, {fd=72, events=POLLIN}, {fd=84, events=POLLIN}, {fd=92, events=POLLIN}, {fd=97, events=POLLIN}], 11, 138) = 1 ([{fd=3, revents=POLLIN}])
  read(3, "\1\0\0\0\0\0\0\0", 16)         = 8
  clock_gettime(CLOCK_MONOTONIC, {1354, 67163758}) = 0
  clock_gettime(CLOCK_MONOTONIC, {1354, 68720297}) = 0
  poll([{fd=3, events=POLLIN}, {fd=47, events=POLLIN}, {fd=48, events=POLLIN}, {fd=56, events=POLLIN}, {fd=59, events=POLLIN}, {fd=66, events=POLLIN}, {fd=67, events=POLLIN}, {fd=72, events=POLLIN}, {fd=84, events=POLLIN}, {fd=92, events=POLLIN}, {fd=97, events=POLLIN}], 11, 132) = 1 ([{fd=3, revents=POLLIN}])
  read(3, "\1\0\0\0\0\0\0\0", 16)         = 8
  clock_gettime(CLOCK_MONOTONIC, {1354, 75648421}) = 0
  clock_gettime(CLOCK_MONOTONIC, {1354, 77449123}) = 0
  poll([{fd=3, events=POLLIN}, {fd=47, events=POLLIN}, {fd=48, events=POLLIN}, {fd=56, events=POLLIN}, {fd=59, events=POLLIN}, {fd=66, events=POLLIN}, {fd=67, events=POLLIN}, {fd=72, events=POLLIN}, {fd=84, events=POLLIN}, {fd=92, events=POLLIN}, {fd=97, events=POLLIN}], 11, 123) = 0 (Timeout)

  It appears to be continually polling the clock, which is a waste of
  cycles.

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