kern/56086: Resume hangs when tpm(4) is enabled

[nia%pkgsrc.org@localhost]

>Number:         56086
>Category:       kern
>Synopsis:       Resume hangs when tpm(4) is enabled
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Mar 30 11:40:00 +0000 2021
>Originator:     nia
>Release:        9.99.81, 9.1
>Organization:
>Environment:
amd64
>Description:
I was wondering why my machine could no longer resume. Turns out it's because I enabled tpm(4) in the BIOS.

With an enabled tpm, on resume, the machine hangs and doesn't wake up the display.

With a disabled tpm, e.g.


tpm0 at isa0 iomem 0xfed40000-0xfed44fff irq 7tpm0: device 0x0000104a rev 0x4e
tpm0 at isa0 iomem 0xfed40000-0xfed44fff irq 7tpm0: device 0x0000104a rev 0x4e
tpm0 at isa0 iomem 0xfed40000-0xfed44fff irq 7
tpm0: device 0x0000104a rev 0x4e
tpm0: tpm is deactivated
tpm0: deactivating entropy source

The machine can reliably resume.
>How-To-Repeat:
Enable tpm after being advised that it has magic entropy-giving powers, wonder why resume no longer works
>Fix: