[Bug 212219] psm device works until reboot or xorg restart

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212219

            Bug ID: 212219
           Summary: psm device works until reboot or xorg restart
           Product: Base System
           Version: 11.0-RC1
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: bsd at abinet.ru

I have very strange problem with Dell XPS 13 Laptop (Skylake version). While
almost works flawlessly, touchpad has issue with hw.psm.synaptics_support=1

It works only ones! I mean, the first time I add synaptics support and boot
xorg - cursor moves, button clicks. After I restart xorg - buttons become
unresponsive. button2 event is not registered anymore, button1 event registered
maybe 1 time for 10 taps and it can stick in pressed state, leaving touchpad
completely unusable. 

I recompiled kernel with psm_debug flag = 1 and noticed nothing suspicious. To
workaround the issue I must enable-disable device with xinput. 
The interesting part is that on enable phase the system hangs until I tap the
touchpad. 

I tried linux from pen drive - touchpad works, so this is not a hardware
problem.

synaptics driver has the same problem, however it survives xorg restart.
Touchpad becomes broken after reboot, in broken state Xorg.log is being rapidly
filled with synaptics driver attached to psm0 device - like driver attaches to
device in endless loop.

I have no idea what information provide - the problem looks completely insane
and unique. 

CURRENT has the same problem.

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