Public bug reported:
In normal case, Arale consumes ~310mA (brightness 1160) when stay in all
other system settings pages. But when navigate to either Updates or
Storage page, power meter readings raise to 700mA (brightness 1160)
immediately and never go down again until screen dim (brightness 60), at
which Arale still takes ~600mA while other pages take ~110mA.
STR:
1. disable idle lock at "System Settings" / "Security & Privacy" / "Lock when
idle" => Never
2. navigate to "System Settings" / "Updates" and check power meter readings
before and after screen dim
3. navigate to "System Settings" / "About this phone" / "Storage" and check
power meter readings before and after screen dim
Expect:
Power meter readings go down to 310mA before screen dim and 110mA after.
Actual:
1. Updates page:
power meter readings stay in ~700mA before screen dim and ~600mA after. `top`
reveals that system-settings process takes 25% cpu time, unity8 takes ~35%,
unity-system-compositor takes 12% constantly.
2. Storage page: power meter readings stay in ~740mA before screen dim
and ~620mA after. `top` reveals that system-settings process takes >40%
cpu time, unity8 takes 33%, unity-system-compositor takes 12.5%
constantly.
$ system-image-cli -i
current build number: 7
device name: arale
channel: ubuntu-touch/rc-proposed/ubuntu
last update: 2015-05-30 00:04:38
version version: 7
version ubuntu: 20150529.1
version device: 20150522-a851049
version custom: 20150529.1
$ apt-cache policy unity8
unity8:
Installed: 8.02+15.04.20150518.1-0ubuntu2
Candidate: 8.02+15.04.20150518.1-0ubuntu2
Version table:
*** 8.02+15.04.20150518.1-0ubuntu2 0
1001
http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu/
vivid/main armhf Packages
100 /var/lib/dpkg/status
8.02+15.04.20150409.1-0ubuntu1 0
500 http://ports.ubuntu.com/ubuntu-ports/ vivid/universe armhf Packages
$ apt-cache policy ubuntu-system-settings
ubuntu-system-settings:
Installed: 0.3+15.04.20150514-0ubuntu1
Candidate: 0.3+15.04.20150514-0ubuntu1
Version table:
*** 0.3+15.04.20150514-0ubuntu1 0
1001
http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu/
vivid/main armhf Packages
100 /var/lib/dpkg/status
0.3+15.04.20150413-0ubuntu1 0
500 http://ports.ubuntu.com/ubuntu-ports/ vivid/universe armhf Packages
** Affects: ubuntu-system-settings (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1460945
Title:
System Settings Updates/Storage pages consume 700mA or more even there
is no network/io activity
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