On Wed, Jan 23, 2019 at 9:13 AM Eric Blau <eblau@xxxxxxxxx> wrote:
>
> On Tue, Jan 22, 2019 at 2:28 PM Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote:
> >
> > In the absence of any better suggestions, you can always try using git
> > bisect between 4.19.4 and 4.19.8. The amount of churn ought to be
> > relatively small, so it shouldn't take too long to home in on the
> > commit which caused the problem.
> >
> > Also, you should provide a little more information about your system in
> > your bug report. For example, the output from "lsusb".
>
> Thanks, Alan. I'll try a bisect but I'm running a ZFS root filesystem
> which is out-of-tree so it's a pain to rebuild and install the ZFS
> modules after every bisect as well. I'll see what I can do.
>
> Here's lsusb:
>
> Bus 002 Device 002: ID 05ac:8406 Apple, Inc.
> Bus 002 Device 005: ID 0424:5537 Standard Microsystems Corp.
> Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
> Bus 001 Device 003: ID 05ac:0273 Apple, Inc. Internal Keyboard/Trackpad (ISO)
> Bus 001 Device 002: ID 05ac:8290 Apple, Inc. Bluetooth Host Controller
> Bus 001 Device 014: ID 05ac:1402 Apple, Inc. Ethernet Adapter [A1277]
> Bus 001 Device 018: ID 062a:4102 MosArt Semiconductor Corp.
> Bus 001 Device 017: ID 05e3:0608 Genesys Logic, Inc. Hub
> Bus 001 Device 016: ID 04d9:2013 Holtek Semiconductor, Inc. Keyboard
> [Das Keyboard]
> Bus 001 Device 015: ID 0424:2137 Standard Microsystems Corp.
> Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
>
> I've not narrowed down the exact trigger for the problem as it seems
> intermittent. If I have any more insight, I'll share it.
I finally was able to complete the bisect on this issue. It seems that
this commit introduced the regression on my MacBook Pro:
cc8b329fef53c74a4abf98b0755b3832d572d6ce is the first bad commit
commit cc8b329fef53c74a4abf98b0755b3832d572d6ce
Author: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
Date: Thu Nov 15 11:38:41 2018 +0200
usb: xhci: Prevent bus suspend if a port connect change or polling
state is detected
commit 2f31a67f01a8beb22cae754c53522cb61a005750 upstream.
As reported earlier, with this commit, my laptop fails to suspend with
the following errors:
Feb 02 17:56:43 eric-macbookpro kernel: dpm_run_callback():
usb_dev_suspend+0x0/0x10 returns -16
Feb 02 17:56:43 eric-macbookpro kernel: PM: Device usb2 failed to
suspend async: error -16
Feb 02 17:56:43 eric-macbookpro kernel: PM: Some devices failed to
suspend, or early wake event detected
I also occasionally see a ksoftirqd and kworker thread/process
together taking up 100% of one core.
Regards,
Eric
