unity8 uses 100% CPU with MIR and device idle

[Jean-Baptiste Lallement]

with MIR enabled, unity8 is constantly using at least 100% CPU, even when the device is idle

TEST CASE
1. Flash a device and enable MIR
2. Reboot and unlock the screen
3. Connect over adb and run 'top'
4. Watch top CPU consumers

ACTUAL RESULT:
unity8 never uses less than 100% CPU even when the device is not in use. When the device is in use it jumps to more than 150%.
The device also becomes very hot.

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: unity8 7.81.3+13.10.20130927.3-0ubuntu1
Uname: Linux 3.4.0-3-mako armv7l
ApportVersion: 2.12.5-0ubuntu1
Architecture: armhf
Date: Thu Oct 3 06:35:45 2013
InstallationDate: Installed on 2013-10-03 (0 days ago)
InstallationMedia: Ubuntu Saucy Salamander (development branch) - armhf (20131003)
MarkForUpload: True
ProcEnviron:
 TERM=linux
 PATH=(custom, no user)
SourcePackage: unity8
UpgradeStatus: No upgrade log present (probably fresh install)

[Daniel van Vugt (vanvugt)]

Sounds like bug 1233870 (fix not released just yet).

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.