** Changed in: unity8 (Ubuntu)
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/1486341
Title:
[performance] Touch scrolling is stu
** No longer affects: qtmir
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https://bugs.launchpad.net/bugs/1486341
Title:
[performance] Touch scrolling is stuttery under Unity8 (but only while
you're to
** Branch linked: lp:~vanvugt/unity8/more-smooth-less-lag
** Changed in: qtmir
Status: New => Won't Fix
** Changed in: qtmir (Ubuntu)
Status: Confirmed => Won't Fix
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** Changed in: unity8 (Ubuntu)
Assignee: (unassigned) => Daniel van Vugt (vanvugt)
** Changed in: unity8 (Ubuntu)
Status: Confirmed => In Progress
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Annoyingly, in order to reliably set QML_NO_TOUCH_COMPRESSION, you have
to do it in the parent process before unity8 or the Qt client is
launched. Because it's only checked once on static initialization:
static bool qquickwindow_no_touch_compression =
qEnvironmentVariableIsSet("QML_NO_TOUCH_COMPR
Considering also related bug 1497105 and bug 1488386, I think all three would
benefit from us removing input resampling completely from the top-level (unity8
process) via:
QML_NO_TOUCH_COMPRESSION=1
MIR_CLIENT_INPUT_RATE=0
That would immediately solve this bug, and bug 1497105, and partial
Yes, using just Mir's 59Hz input rate by itself would appear to solve
this bug. However looking ahead we need a different solution. Because
we'll soon be ready to re-enable Mir's dynamic queue scaling that can
provide significantly lower latency. However for touch-driven apps it
only works when the
** Summary changed:
- Touch scrolling is stuttery under Unity8 (but only while you're touching it)
+ [performance] Touch scrolling is stuttery under Unity8 (but only while you're
touching it)
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