Debian Hardware :: External USB Hub Not Detected After Resumption From S3 Sleep

Aug 4, 2015

I am reporting two problems that could be related to each other. They have something to do with USB devices upon passing through the ACPI S3 sleep-resume cycle. The hardware is Thinkpad T450s, with Debian 8 64-bit edition. Kernel is provided by either the stock linux-image-3.16.0-4-amd64 or Liquorix's linux-image-4.1-3.dmz.1-liquorix-amd64 . For this case, it does not matter; the problem exists in both versions.

I have an external USB hub which has a USB keyboard receiver (for Microsoft wireless keyboard/mouse combo) attached to the hub. I then usually attach this hub to the laptop.

FIRST: The main problem is that the USB hub was not going to be re-detected upon resumption from sleep. Here is the sequence of events, in brief:

* Laptop was resumed from S3 sleep
* USB hub was attached to the laptop (has external keyboard receiver attached to the hub)--both were detected & working properly
* Laptop was put to S3 sleep
* Laptop was resumed from S3 sleep, both hub and external keyboard were not detected, the syslog says "USB disconnect" to that particular device.

Note that during all the actions above, the laptop is running by external AC power.

SECOND: I also found that the USB hub, if inserted while the laptop was asleep (before resumed), it would not get detected. `lsusb` turns nothing for that device, as if nothing was inserted in the laptop's USB port.

THIRD: I did an experiment this way: instead of putting keyboard receiver on the hub, I attached it to the laptop directly. Hub is still attached elsewhere on the laptop as well. In this way, the keyboard receiver is not malfunctioning after resume. But I found out that the keyboard receiver is behaving funny after resumption. It went to a kind of "very low power" state a lot when idling (not receiving keystroke/mouse movement) for more than about 3 seconds. This causes the external keyboard response to be sluggish, since the receiver has to be turned on back to "active" state before able to responsively receive keystrokes properly again. And this causes a lot of lost keystrokes.

In the second case, the sequence of events are like this:

* Laptop was resumed from S3 sleep
* USB hub was attached to the laptop; it is working
* External keyboard receiver was attached to the laptop; it is working
* Laptop was put to S3 sleep
* Laptop was resumed from S3 sleep, the hub was not detected anymore; the syslog says "USB disconnect" to that particular device. The external keyboard was re-detected, but now is running in a funny power state described above.

These issues did not exist when I use a different laptop running Debian 7/oldstable (wheezy).

Here's the lsusb output before sleep (after the USB hub was attached the laptop):

Code: Select all    ~ $ lsusb
    Bus 003 Device 002: ID 8087:8001 Intel Corp.
    Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
    Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
    Bus 001 Device 004: ID 5986:0366 Acer, Inc
    Bus 001 Device 003: ID 8087:0a2a Intel Corp.
    Bus 001 Device 008: ID 045e:071d Microsoft Corp.
    Bus 001 Device 007: ID 1a40:0101 Terminus Technology Inc. 4-Port HUB
    Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Now to back to sleep, then resume. This is what comes up:

Code: Select all    $ lsusb
    Bus 003 Device 002: ID 8087:8001 Intel Corp.
    Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
    Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
    Bus 001 Device 004: ID 5986:0366 Acer, Inc
    Bus 001 Device 003: ID 8087:0a2a Intel Corp.
    Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Devices (045e:071d and 1a40:0101) were not detected again!

I included below excerpts of syslog to show the effect of sleep/resume to the USB devices. I munged it from the full syslog using this command:

Code: Select all    grep -i -e usb -e "systemd.*(suspend|sleep|resum)" -e "pm:" syslog| killutf8 > syslog.usb-only

Syslog events (for FIRST case above):

Code: Select all  # [SLEEP1]
    Aug  4 11:57:28 wirawan2 kernel: PM: Syncing filesystems ... done.
    Aug  4 11:57:28 wirawan2 kernel: PM: suspend of devices complete after 701.491 msecs
    Aug  4 11:57:28 wirawan2 kernel: PM: late suspend of devices complete after 11.036 msecs
    Aug  4 11:57:28 wirawan2 kernel: PM: noirq suspend of devices complete after 14.231 msecs
    Aug  4 11:57:28 wirawan2 kernel: PM: Saving platform NVS memory
  # [RESUME1]

[Code] ....

I found several postings on the web similar to this, e.g. [URL] .... and see the references therein. But I don't think the problem is the same as mine. In particular, only external USB hub gives me problem like this (as well as the keyboard receiver, to a lesser extent)..

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Code: Select allScreen 0: minimum 320 x 200, current 1600 x 900, maximum 8192 x 8192
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Code:

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