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[Michael Vogt <michael.vogt@xxxxxxxxxxxxx>]

I installed unity8-destktop-session-x11 to test click on the desktop but
I did not change any config (to my knowledge :) except for installing
this package. I actually thought I had unity8-desktop-session-mir
installed, but it seems that during testing I moved to the other one.
And indeed, when I remove unity8-desktop-session-x11 the 100% CPU
problem goes away.

Here is the output of lightdm --show-config with the unity8-desktop-session-x11 package installed:
"""
   [SeatDefaults]
A  type=unity;xlocal
A  unity-compositor-command=unity-system-compositor.sleep
J  user-session=ubuntu
C  greeter-wrapper=/usr/lib/lightdm/lightdm-greeter-session
E  guest-wrapper=/usr/lib/lightdm/lightdm-guest-session
H  greeter-session=lightdm-gtk-greeter
G  xserver-command=X -core

   [LightDM]
J  session-wrapper=/etc/lightdm/Xsession
J  minimum-vt=7
J  seats=seat-0

   [GuestAccount]
J  enabled=true
J  username=guest
J  setup-script=/usr/share/lightdm/guest-session/guest-session-setup.sh
J  cleanup-script=/usr/share/lightdm/guest-session/guest-session-cleanup.sh

Sources:
A  /usr/share/lightdm/lightdm.conf.d/10-unity-system-compositor.conf
(null)  mand.conf
C  /usr/share/lightdm/lightdm.conf.d/50-greeter-wrapper.conf
E  /usr/share/lightdm/lightdm.conf.d/50-guest-wrapper.conf
E  /usr/share/lightdm/lightdm.conf.d/50-guest-wrapper.conf
(null)  mand.conf
G  /usr/share/lightdm/lightdm.conf.d/50-xserver-command.conf
H  /usr/share/lightdm/lightdm.conf.d/60-lightdm-gtk-greeter.conf
[Invalid UTF-8] (null)  \xe8\x87\xa9\xc8@\x7f
J  /etc/lightdm/lightdm.conf
"""


I see the 100% CPU with different environments like "mate" too, but lightdm is using the same commandline for X, i.e. its running with -mir -mirSocket when the u-d-s-x11 package is installed.

Feel free to reassign to Xmir.

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to lightdm in Ubuntu.
https://bugs.launchpad.net/bugs/1365855

Title:
  100% cpu in Xorg when xorg is started via lightdm

Status in “lightdm” package in Ubuntu:
  Incomplete

Bug description:
  I see Xorg using 100% cpu when its running via lightdm.

  This is not the case if I start X via "startx" or when its run from lxdm or gdm. A strace from a VT shows constant activity (where gdm has only a select() waiting). Most notably this repeats:
  """
  select(256, [0 1 3 5 13 24 25 26], NULL NULL {417 413000}) = 1 (in [0], left {417, 412998})
  read(0, 0x7ffff2bef74a0, 1024) = -1 (Bad file descriptor)
  """
  (transcripted from the affected machine).

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