linux-kernel - Re: Immediate wakeup after suspend

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Message-ID: <CAOULuOZ9gX_iZSN+oZGVq7tkTjbGA+28LnY4stZXRzsvqry+Ug@mail.gmail.com>
Date:	Tue, 7 May 2013 17:18:05 -0400
From:	Parag Warudkar <parag.lkml@...il.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>,
	LKML <linux-kernel@...r.kernel.org>
Cc:	Linux PM list <linux-pm@...r.kernel.org>
Subject: Re: Immediate wakeup after suspend

On Mon, May 6, 2013 at 8:57 PM, Parag Warudkar <parag.lkml@...il.com> wrote:
> On Mon, May 6, 2013 at 8:45 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
>>> I have tried disabling EHC1 and EHC2 without any difference.
>>
>> That may mean one of two things: (1) After you'd tried that they appeared as
>> disabled, but the immediate wakeup still happened or (2) you'd tried to
>> disable them, but they still appeared as enabled.
>>
>> Which one of them is it?
>>
>
> #1 - that is they appeared disabled but the wakeup was still
> immediate. I tried that at least twice before sending the initial
> email and got the immediate wakeups both times but  when I tried to
> recreate this right now with the same kernel and now I get a bunch of
> WARN_ON()s but no immediate wakeups. (I can still wake it up by
> pressing power button.)
> I will test more and also bisect to see what is going on.

So on a hunch I removed radeon UVD firmware to disable UVD from
initializing and the problem goes away.
Turns out, earlier when the problem did not reproduce I was running a
kernel with a local patch that disables UVD.

I have tested this 3 times each - with UVD loaded the machine resumes
instantly. Without it, it works as expected.
I let the radeon/dri people know about it.

Thanks,
Parag
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