[igt-dev] [Intel-gfx] [PATCH i-g-t] lib/igt_pm: Restore runtime pm state on test exit

[Chris Wilson]

Quoting Tvrtko Ursulin (2018-02-28 11:08:29)
> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> 
> Some tests (the ones which call igt_setup_runtime_pm and
> igt_pm_enable_audio_runtime_pm) change default system configuration and
> never restore it.
> 
> The configured runtime suspend is aggressive and may influence behaviour
> of subsequent tests, so it is better to restore to previous values on test
> exit.
> 
> This way system behaviour, with regards to a random sequence of executed
> tests, will be more consistent from one run to another.

Otoh, if behaviour changes in subsequent tests, we likely have a lack of
testing :(
-Chris