Public bug reported:
Since the upgrade to 4.15.0-56-generic (Ubuntu 18.04), my computer fails to
suspend.
Suspend still works fine if I boot with previous kernel (4.15.0-55-generic).
Looking at the changelog, I suspect the following change to be the cause of
this regression:
>> - usb: xhci: Prevent bus suspend if a port connect change or polling state
>> is
detected
Indeed, my dmesg is also spammed all the time with USB failures and I
would not be surprised that this change disallows suspending just
because something is happening on my USB bus.
Below, example of spam I often see in my journal:
[ 55.772109] usb 2-5: new full-speed USB device number 14 using xhci_hcd
[ 55.900048] usb 2-5: device descriptor read/64, error -71
[ 56.136052] usb 2-5: device descriptor read/64, error -71
(this repeats a lot of times, the device number is incremented every
time)
By the way, lsusb does not list any device on usb 2-5.
Of course, I may be wrong about the causal relation between all these
observations but it does not look all too much harebrained to me.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
** Tags: bionic
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https://bugs.launchpad.net/bugs/1838514
Title:
Suspend failure with kernel 4.15.0-56-generic
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