[Bug 1486341] Re: [performance] Touch scrolling is stuttery under Unity8 (but only while you're touching it)
** Changed in: unity8 (Ubuntu) Status: In Progress => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1486341 Title: [performance] Touch scrolling is stuttery under Unity8 (but only while you're touching it) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qtmir/+bug/1486341/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1486341] Re: [performance] Touch scrolling is stuttery under Unity8 (but only while you're touching it)
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_COMPRESSION");
So whatever is launching unity8 (upstart job?) has to set
QML_NO_TOUCH_COMPRESSION. And the same goes for Qt apps.
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Title:
[performance] Touch scrolling is stuttery under Unity8 (but only while
you're touching it)
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[Bug 1486341] Re: [performance] Touch scrolling is stuttery under Unity8 (but only while you're touching it)
** 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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1486341 Title: [performance] Touch scrolling is stuttery under Unity8 (but only while you're touching it) To manage notifications about this bug go to: https://bugs.launchpad.net/qtmir/+bug/1486341/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1486341] Re: [performance] Touch scrolling is stuttery under Unity8 (but only while you're touching it)
** Changed in: unity8 (Ubuntu) Assignee: (unassigned) => Daniel van Vugt (vanvugt) ** Changed in: unity8 (Ubuntu) Status: Confirmed => In Progress -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1486341 Title: [performance] Touch scrolling is stuttery under Unity8 (but only while you're touching it) To manage notifications about this bug go to: https://bugs.launchpad.net/qtmir/+bug/1486341/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1486341] Re: [performance] Touch scrolling is stuttery under Unity8 (but only while you're touching it)
** No longer affects: qtmir -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1486341 Title: [performance] Touch scrolling is stuttery under Unity8 (but only while you're touching it) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qtmir/+bug/1486341/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1486341] Re: [performance] Touch scrolling is stuttery under Unity8 (but only while you're touching it)
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 partially solve the keep-awake problem of bug 1488386. The only issue then is to make sure shell elements are still responsive in the presence of high frequency input events. Apps themselves would not be affected because they already have their own resampling. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1486341 Title: [performance] Touch scrolling is stuttery under Unity8 (but only while you're touching it) To manage notifications about this bug go to: https://bugs.launchpad.net/qtmir/+bug/1486341/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1486341] Re: [performance] Touch scrolling is stuttery under Unity8 (but only while you're touching it)
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 input rate is at least that of the display. So we need Mir's input rate raised to 60Hz, or to fix the Qt touch compression and use that instead (non-nested, so only in unity8 but not apps). -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1486341 Title: [performance] Touch scrolling is stuttery under Unity8 (but only while you're touching it) To manage notifications about this bug go to: https://bugs.launchpad.net/qtmir/+bug/1486341/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1486341] Re: [performance] Touch scrolling is stuttery under Unity8 (but only while you're touching it)
** 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) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1486341 Title: [performance] Touch scrolling is stuttery under Unity8 (but only while you're touching it) To manage notifications about this bug go to: https://bugs.launchpad.net/qtmir/+bug/1486341/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
