Public bug reported:
eventstat showing two unity8 threads on an idle desktop:
Event/s PID Task Init Function Callback
62.00 12359 QSGRenderThread do_nanosleep hrtimer_wakeup
62.00 11858 unity8 schedule_hrtimeout_range_ hrtimer_wakeup
Although it's not calling swap buffers or rendering anything (confirmed
by MIR_CLIENT_PERF_REPORT=log). Just waking up at around the same
frequency as the screen (although 62Hz is more like every 16.0ms, unlike
the screen's 16.68ms/59.95Hz)
** Affects: canonical-devices-system-image
Importance: Undecided
Status: New
** Affects: ubuntu-power-consumption
Importance: Undecided
Status: New
** Affects: qtmir (Ubuntu)
Importance: Undecided
Status: New
** Affects: unity8 (Ubuntu)
Importance: Medium
Status: New
** Tags: performance power-management regression unity8-desktop
** Also affects: qtmir (Ubuntu)
Importance: Undecided
Status: New
** Also affects: canonical-devices-system-image
Importance: Undecided
Status: New
** Description changed:
eventstat showing two unity8 threads on an idle desktop:
- Event/s PID Task Init Function Callback
- 62.00 12359 QSGRenderThread do_nanosleep hrtimer_wakeup
- 62.00 11858 unity8 schedule_hrtimeout_range_ hrtimer_wakeup
+ Event/s PID Task Init Function Callback
+ 62.00 12359 QSGRenderThread do_nanosleep hrtimer_wakeup
+ 62.00 11858 unity8 schedule_hrtimeout_range_ hrtimer_wakeup
+
+ Although it's not calling swap buffers or rendering anything (confirmed
+ by MIR_CLIENT_PERF_REPORT=log). Just waking up at around the same
+ frequency as the screen.
** Also affects: ubuntu-power-consumption
Importance: Undecided
Status: New
** Description changed:
eventstat showing two unity8 threads on an idle desktop:
Event/s PID Task Init Function Callback
62.00 12359 QSGRenderThread do_nanosleep hrtimer_wakeup
62.00 11858 unity8 schedule_hrtimeout_range_ hrtimer_wakeup
Although it's not calling swap buffers or rendering anything (confirmed
by MIR_CLIENT_PERF_REPORT=log). Just waking up at around the same
- frequency as the screen.
+ frequency as the screen (although 62Hz is more like every 16ms, unlike
+ the screen's 16.68ms/59.95Hz)
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https://bugs.launchpad.net/bugs/1664828
Title:
Unity8 wakes up continuously at around 62Hz on an idle desktop
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