[Bug 246965] iwn_init_locked: could not initialize hardware, error 60

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246965

            Bug ID: 246965
           Summary: iwn_init_locked: could not initialize hardware, error
                    60
           Product: Base System
           Version: Unspecified
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: wireless
          Assignee: wireless at FreeBSD.org
          Reporter: jwb at freebsd.org

Some recent update around February or March if I recall caused this issue to
arise on my Lenovo X201.  The iwn WiFi had been working reliably for maybe a
year before that.  It occurs on both 11.3-RELEASE and 12.1-RELEASE.  I swapped
in a disk from another machine to test 11.3.

The iwn WiFi works fine for a while after a cold or warm boot, then suddenly
goes dark after anywhere from a few minutes to maybe half an hour and logs the
following:

May 24 11:57:39 mako kernel: iwn0: iwn_read_firmware: ucode rev=0x09dd0401
May 24 12:45:07 mako kernel: iwn0: iwn_read_firmware: ucode rev=0x09dd0401
May 24 12:50:34 mako kernel: iwn0: device timeout
May 24 12:50:34 mako kernel: iwn0: iwn_read_firmware: ucode rev=0x09dd0401
May 24 12:50:34 mako kernel: iwn0: iwn_hw_init: could not power ON adapter,
error 60
May 24 12:50:34 mako kernel: iwn0: iwn_init_locked: could not initialize
hardware, error 60

I confirmed that it's a FreeBSD regression and not a hardware failure by
installing Debian on this machine.  Debian has its own set of issues, but the
Intel WiFi works reliably.

Specs:

Jun  3 14:25:38 manatee kernel: iwn0: <Intel Centrino Advanced-N 6200> mem
0xf2400000-0xf2401fff irq 16 at device 0.0 on pci3
Jun  3 14:25:38 manatee kernel: iwn0: iwn_read_firmware: ucode rev=0x09dd0401

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