Also useful is an lspci and /var/log/Xorg.0.log.
** Changed in: lightdm (Ubuntu)
Status: New => Incomplete
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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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