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
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