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From:   "Rafael J. Wysocki" <rafael@kernel.org>
Date:   Mon, 25 Nov 2019 22:46:09 +0100
Message-ID: <CAJZ5v0hFjW-MG5Jxqx7maC0OH9XzrAPEVqzidQhTORTW5i1M1g@mail.gmail.com>
Subject: Re: Help me fix a regression caused by 56b9918490 (PM: sleep:
 Simplify suspend-to-idle control flow)
To:     "Kenneth R. Crudup" <kenny@panix.com>
Cc:     "Rafael J. Wysocki" <rafael@kernel.org>,
        Rafael Wysocki <rafael.j.wysocki@intel.com>,
        Linux PM <linux-pm@vger.kernel.org>
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On Mon, Nov 25, 2019 at 5:21 PM Kenneth R. Crudup <kenny@panix.com> wrote:
>
>
> On Mon, 25 Nov 2019, Rafael J. Wysocki wrote:
>
> > OK, but with sleep_no_lps0, does it also hang during resume or not?
>
> It never goes to sleep, is what I'm saying. Screen goes dark, but the machine
> seems to never go into sleep states.

So what exactly does happen when you try to suspend with
sleep_no_lps0?  Does it return to user space right away by itself, or
do you need to do anything to make it do so?