*** This bug is a duplicate of bug 1488386 ***
https://bugs.launchpad.net/bugs/1488386
Public bug reported:
On some devices (mako at least) it's possible to force double buffering
and it will often keep up:
restart unity8 QML_NO_TOUCH_COMPRESSION=1 MIR_SERVER_NBUFFERS=2
Curiously however it only keeps up smoothly (eg. during a dash scroll)
while you're touching the screen. If you lift off or fling the dash then
it immediately stutters, quite badly.
So the issue is not that the device can't keep up with double buffering. It
seems more like we're not keeping the kernel sufficiently awake and it's
clocking down prematurely, as soon as we're not touching it. Certainly
adjusting the variables in:
/sys/devices/system/cpu/cpu0/cpufreq
it is possible to raise the performance and minimum frequency to make double
buffering smooth.
The challenge of this bug is to find a way in Mir/QtMir to keep the
kernel more awake so it doesn't clock down when we need smooth
animations and we're not touching the screen.
** Affects: mir
Importance: Undecided
Assignee: Daniel van Vugt (vanvugt)
Status: New
** Affects: qtmir
Importance: Undecided
Status: New
** Affects: mir (Ubuntu)
Importance: Undecided
Status: New
** Affects: qtmir (Ubuntu)
Importance: Undecided
Status: New
** Tags: performance
** Also affects: qtmir
Importance: Undecided
Status: New
** Also affects: qtmir (Ubuntu)
Importance: Undecided
Status: New
** Also affects: mir (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1488391
Title:
Double buffering is only smooth while you're touching it
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