Public bug reported:
In both XUbuntu 13.04 and 13.10 Xorg will spike to 100% CPU usage for
around 15 seconds whenever I hotplug a USB mouse. In this time not only
is the CPU used fully, Xorg itself also becomes non-responsive, the
mouse pointer itself, even from the newly plugged in mouse, will move
just fine, but focus changes and button presses won't be registered
until 15 seconds later. When I look with xev at the events at that time
I will see around 4000 lines of this:
MappingNotify event, serial 37, synthetic NO, window 0x0,
request MappingKeyboard, first_keycode 10, count 1
MappingNotify event, serial 37, synthetic NO, window 0x0,
request MappingKeyboard, first_keycode 10, count 1
MappingNotify event, serial 37, synthetic NO, window 0x0,
request MappingKeyboard, first_keycode 10, count 1
MappingNotify event, serial 750, synthetic NO, window 0x0,
request MappingKeyboard, first_keycode 218, count 1
[...]
MappingNotify event, serial 750, synthetic NO, window 0x0,
request MappingKeyboard, first_keycode 218, count 1
MappingNotify event, serial 750, synthetic NO, window 0x0,
request MappingKeyboard, first_keycode 218, count 1
MappingNotify event, serial 750, synthetic NO, window 0x0,
request MappingModifier, first_keycode 0, count 0
MappingNotify event, serial 750, synthetic NO, window 0x0,
request MappingModifier, first_keycode 0, count 0
Some applications, most noticably xfce4-volumed, will themselves spike in CPU
usage as a return to Xorg doing it and prolong the problem up to multiple
minutes. But as the problem happens even without them running they don't seem
to be the cause of it.
** Affects: xorg-server (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1200074
Title:
High CPU usage and unresponsivness when hotplugging a mouse
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