** Changed in: mir
Status: Fix Committed => Fix Released
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Title:
[regression] Unity8 stutters constantly (like
** Branch linked: lp:~ci-train-bot/mir/mir-ubuntu-zesty-2818
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Title:
[regression] Unity8 stutters constantly (like half
** Branch linked: lp:~ci-train-bot/mir/mir-ubuntu-artful-2806
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Title:
[regression] Unity8 stutters constantly (like half
** Branch linked: lp:~ci-train-bot/mir/mir-ubuntu-yakkety-2783
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Title:
[regression] Unity8 stutters constantly (like
** Branch linked: lp:~ci-train-bot/mir/mir-ubuntu-xenial-2736
** Branch linked: lp:~ci-train-bot/mir/mir-ubuntu-yakkety-2783.1
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** Branch linked: lp:~ci-train-bot/mir/mir-ubuntu-zesty-2683
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Title:
[regression] Unity8 stutters constantly (like half
** Changed in: canonical-devices-system-image
Status: Fix Committed => Fix Released
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Title:
[regression] Unity8
** Changed in: mir/0.26
Status: Fix Committed => Fix Released
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Title:
[regression] Unity8 stutters constantly
This bug was fixed in the package mir - 0.26.1+17.04.20170209.1-0ubuntu1
---
mir (0.26.1+17.04.20170209.1-0ubuntu1) zesty; urgency=medium
* New upstream release 0.26.1 (https://launchpad.net/mir/+milestone/0.26.1)
- ABI summary:
. mirclient ABI unchanged at 9
.
** Summary changed:
- [regression] Unity8 stutters constantly (like half frame rate)
+ [regression] Unity8 stutters constantly (like half frame rate) using Mir
0.26.0
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Fix committed to lp:mir/0.26 at revision 4004, scheduled for release in
Mir 0.26.1
** Changed in: mir/0.26
Status: Triaged => Fix Committed
** Changed in: canonical-devices-system-image
Assignee: (unassigned) => Daniel van Vugt (vanvugt)
** Changed in: canonical-devices-system-image
** Changed in: mir
Status: In Progress => Fix Committed
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Title:
[regression] Unity8 stutters constantly (like
** Branch linked: lp:~ci-train-bot/mir/mir-ubuntu-zesty-2435
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Title:
[regression] Unity8 stutters constantly (like
** Branch linked: lp:mir/0.26
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Title:
[regression] Unity8 stutters constantly (like half frame rate)
Status in
** Branch linked: lp:mir
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Title:
[regression] Unity8 stutters constantly (like half frame rate)
Status in Canonical
** Branch linked: lp:~vanvugt/mir/fix-missing-vsync
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Title:
[regression] Unity8 stutters constantly (like half frame
OK, I think I understand this now. Maybe.
The problem is that the unity8 nested server BufferStream has not been
assigned a frame_clock (doesn't know what monitor to sync to), so it's
defaulting to unthrottled behaviour even though the swap interval is 1.
This problem should probably occur with
So it seems like the issue is a combination of:
1. Unity8 using a zero swap interval (somehow, by accident?)
2. Unity8 taking around 10ms to render each frame -> 100Hz
3. USC can only take one frame every 16.6ms (60Hz), so will drop half of what
Unity8 produces.
This yields only 50Hz
And from Unity System Compositor I can get:
[2017-02-02 14:00:54.259614] compositor: Display 0x7fadf0007be0 averaged 53.175
FPS, 0.000 ms/frame, latency 4.910 ms, 54 frames over 1.015 sec, 100% bypassed
[2017-02-02 14:00:55.260318] compositor: Display 0x7fadf0007be0 averaged 51.963
FPS, 0.000
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: unity8 (Ubuntu)
Status: New => Confirmed
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No problem specifically with Qt... System Settings is still silky-smooth
under Mir demo servers:
mirrun system-settings
So the issue seems to be localised to the Unity8 server/compositor.
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It appears Unity8 is unthrottled, as in swap interval 0. So when I drag
a window around rapidly it matches the USB mouse event rate rather than
the display's refresh rate. MIR_CLIENT_PERF_REPORT shows:
[2017-02-02 10:29:02.531811] perf: : 131.00 FPS, render time 7.61ms, buffer lag
22.92ms (4
** Changed in: mir
Milestone: None => 0.26.1
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Title:
[regression] Unity8 stutters constantly (like half frame
It actually feels like Unity8 has accidentally set swap interval to 2.
In previous Mir releases that would have been ignored, but in Mir 0.26.0
that is now honoured.
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