RE: USB devices on Dell TB16 dock stop working after resuming

[Mario.Limonciello]

> -----Original Message-----
> From: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
> Sent: Monday, November 4, 2019 9:45 AM
> To: Paul Menzel
> Cc: Andreas Noever; Michael Jamet; Yehezkel Bernat; Christian Kellner; Linux
> Kernel Mailing List; Limonciello, Mario
> Subject: Re: USB devices on Dell TB16 dock stop working after resuming
> 
> 
> [EXTERNAL EMAIL]
> 
> On Mon, Nov 04, 2019 at 04:44:40PM +0200, Mika Westerberg wrote:
> > On Mon, Nov 04, 2019 at 04:25:03PM +0200, Mika Westerberg wrote:
> > > Hi,
> > >
> > > On Mon, Nov 04, 2019 at 02:13:13PM +0100, Paul Menzel wrote:
> > > > Dear Linux folks,
> > > >
> > > > On the Dell XPS 13 9380 with Debian Sid/unstable with Linux 5.3.7
> > > > suspending the system, and resuming with Dellâs Thunderbolt TB16
> > > > dock connected, the USB input devices, keyboard and mouse,
> > > > connected to the TB16 stop working. They work for a few seconds
> > > > (mouse cursor can be moved), but then stop working. The laptop
> > > > keyboard and touchpad still works fine. All firmware is up-to-date
> > > > according to `fwupdmgr`.
> > >
> > > What are the exact steps to reproduce? Just "echo mem >
> > > /sys/power/state" and then resume by pressing power button?
> >
> > I tried v5.4-rc6 on my 9380 with TB16 dock connected and did a couple of
> > suspend/resume cycles (to s2idle) but I don't see any issues.
> >
> > I may have older/different firmware than you, though.
> 
> Upgraded BIOS to 1.8.0 and TBT NVM to v44 but still can't reproduce this
> on my system :/

Loop Anthony.  Anthony can you see if you guys repro this at all too?

As a potential point of comparison and sometimes pain area, I'm wondering if
something in userland is poking power states for Paul leading to this.

Paul what sort of power management policies are you using on your machine? 
Anything like:
* powertop  --auto-tune, 
* TLP
* systemd > 243 (contains some stuff for automatic suspend)