Thanks. Here are the results of your suggestions, plus some other things
I tried:
1. 'tlp' was not installed.
2. I installed 'powertop' and checked its 'Tunables' section. There were
6 entries for "Autosuspend for USB device xHCI Host Controller" all set
to 'Good' - I changed these to 'Bad'. The problem still occurred.
3. Further diagnostics eventually led to my trying the following:
* added "usbcore.autosuspend=-1" to the GRUB_CMDLINE_LINUX_DEFAULT line in
/etc/default/grub
* ran: sudo update-grub
* rebooted
* cat /sys/module/usbcore/parameters/autosuspend
[shows -1 as expected]
* cat /sys/bus/usb/devices/usb[1-6]/power/autosuspend_delay_ms
[now shows -1000 - (was previously 0) ]
but the problem still occurs.
4. Repeated the above GRUB change with the parameter 'autosuspend_delay_ms'
rather than 'autosuspend'.
* ls /sys/module/usbcore/parameters
[shows an 'autosuspend' parameter but not an 'autosuspend_delay_ms'
parameter]
* sudo modinfo usbcore
[shows: parm: autosuspend:default autosuspend delay (int)]
* cat /sys/bus/usb/devices/usb[1-6]/power/autosuspend_delay_ms
[now shows 0]
but the problem still occurs.
In all cases I still get the same five 'device removed' messages in
/var/log/Xorg.0.log as originally reported, and the mouse and keyboard
are unresponsive after a few minutes idle time.
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https://bugs.launchpad.net/bugs/1912670
Title:
Mouse buttons and keyboard unresponsive after idle time
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