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Running SysFsDriverTests or RaspberryPiDriverTests causes PWM to be unusable

See original GitHub issue

After running SysFsDriverTests or RaspberryPiDriverTests PWM no longer works.

I have 100% repro: If I run PWM tests in a loop or run LibGpiodDriverTests everything works without any issues. If I run SysFS or RPI3 GPIO tests once after that PWM becomes completely unusable and stops reacting to any changes (regardless if using PWM manually through /sys/class/pwm/ or our APIs) - PI has to be rebooted.

Found during testing https://github.com/dotnet/iot/pull/758

I’m currently on latest from master and my PI3 is running Raspbian after sudo apt-get update and sudo apt-get upgrade (was reproing before updates as well).

I’ll try to further isolate the problem if I have time.