[regression] [OTA-10] Touch scrolling the dash is stuttery again, and lag throughout Unity8 higher than it was in OTA-9

Bug #1556763 reported by Daniel van Vugt
64
This bug affects 13 people
Affects Status Importance Assigned to Milestone
Canonical System Image
Fix Released
High
kevin gunn
unity8 (Ubuntu)
Fix Released
High
Daniel van Vugt

Bug Description

Regression in OTA-10: Touch scrolling the dash is stuttery again, and lag higher than it was.

Test case 1: Scroll the dash smoothly with a finger.
Expected: Dash scrolls smoothly.
Observed: Dash often jumps abruptly.

Test case 2: Pull down/up the notification bar quickly with a finger.
Expected: It closely matches the finger position.
Observed: It's a long way behind.

These issues are so familiar, it's rather obviously a regression of bug 1486341. And I can see the required QML_NO_TOUCH_COMPRESSION=1 has gone missing too.

$ system-image-cli -i
current build number: 387
device name: mako
channel: ubuntu-touch/rc-proposed/ubuntu
last update: 2016-03-14 06:38:12
version version: 387
version ubuntu: 20160312
version device: 20160304.2
version custom: 20160312

Related branches

tags: added: regression
removed: regression-proposed
summary: - [regression] Touch scrolling the dash is stuttery again, and lag higher
- than it was
+ [regression] Touch scrolling the dash is stuttery again, and lag
+ throughout Unity8 higher than it was
tags: added: regression-proposed
Changed in canonical-devices-system-image:
status: New → In Progress
importance: Undecided → High
assignee: nobody → kevin gunn (kgunn72)
milestone: none → ww08-2016
kevin gunn (kgunn72)
Changed in canonical-devices-system-image:
milestone: ww08-2016 → 11
summary: - [regression] Touch scrolling the dash is stuttery again, and lag
- throughout Unity8 higher than it was
+ [regression] [OTA-10] Touch scrolling the dash is stuttery again, and
+ lag throughout Unity8 higher than it was
description: updated
summary: [regression] [OTA-10] Touch scrolling the dash is stuttery again, and
- lag throughout Unity8 higher than it was
+ lag throughout Unity8 higher than it was in OTA-9
Changed in unity8 (Ubuntu):
status: In Progress → Fix Committed
Changed in canonical-devices-system-image:
status: In Progress → Fix Committed
Michał Sawicz (saviq)
Changed in unity8 (Ubuntu):
status: Fix Committed → Fix Released
Revision history for this message
Daniel van Vugt (vanvugt) wrote :

Note the fix is not in Ubuntu proper yet. It's only in PPAs right now...

https://launchpad.net/ubuntu/+source/unity8

kevin gunn (kgunn72)
Changed in canonical-devices-system-image:
status: Fix Committed → Fix Released
status: Fix Released → Fix Committed
kevin gunn (kgunn72)
Changed in canonical-devices-system-image:
status: Fix Committed → Fix Released
Revision history for this message
Michele Giacomoli (michele-giacomoli) wrote :

Hi, after updating unity8 to 8.12+15.04.20160527-0ubuntu1, touch scrolling in dash seems to stutter again in my bq E4.5 (rc-proposed). Can you confirm?

Revision history for this message
Daniel van Vugt (vanvugt) wrote :

It's definitely not perfect yet, we know. And we know the main reasons for that:
  * Unity8 bug 1564721, bug 1384374 and bug 1494795
  * Input events at 59Hz but the E4.5 display is 67Hz.
These issues are being worked on.

This bug however is about a regression of OTA-10 vs OTA-9 and I have confirmed OTA-11 gets us back to the level of smoothness (admittedly still not good enough) that we had in OTA-9.

So this bug is closed, but we have a lot of improvement to make yet. Please subscribe to the other bugs listed above.

Revision history for this message
Michele Giacomoli (michele-giacomoli) wrote :

Thank you Daniel, I'll subscribe to those bugs

To post a comment you must log in.
This report contains Public information  
Everyone can see this information.

Other bug subscribers

Remote bug watches

Bug watches keep track of this bug in other bug trackers.