linux-kernel - Re: [regression, bisected] adb trackpad disappears after suspend to ram

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Date:	Mon, 01 Jun 2009 15:44:51 +0200
From:	Jan Scholz <scholz@...s.uni-frankfurt.de>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Jan Scholz <scholz@...s.uni-frankfurt.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org, Adrian Bunk <bunk@...nel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>
Subject: Re: [regression, bisected] adb trackpad disappears after suspend to ram

"Rafael J. Wysocki" <rjw@...k.pl> writes:

> On Friday 29 May 2009, Jan Scholz wrote:
>> Benjamin Herrenschmidt <benh@...nel.crashing.org> writes:
>> 
>> >> We are too late in the cycle to revert this commit and it really is needed to
>> >> fix a more serious issue.  Nevertheless knowing that it caused the problem to
>> >> appear on your system is also important.
>> >> 
>> >> Ben, do you have an idea what may be going on here?  Does __disable_irq() mask
>> >> the interrupt on this platform?
>> >
>> > I suppose so :-) I'll have to check what's going on, it's not
>> > immediately clear to me.
>> >
>> > Cheers,
>> > Ben.
>> >
>> >> 
>> >> I'd like to see a boot log, preferably containing a suspend-resume in which
>> >> the problem was reproduced.
>> 
>> Here is a log from booting, through several suspend cycles, until the
>> trackpad disappeared. The first few suspends were done while X was
>> running but from the console. As you can tell from lines like
>>    May 28 23:51:26 [kernel] adb devices: [2]: 2 c4 [3]: 3 1 [7]: 7 1f
>> the trackpad was still present. The last suspend was done from within X,
>> here the trackpad did not make it.
>>    May 28 23:58:09 [kernel] adb devices: [2]: 2 c4 [7]: 7 1f
>> However, there have been cases, although not in this log, were the
>> trackpad has been alive even when suspending from within X.
>
> This means the problem is probably timing-related.
>
> Can you please try to comment out suspend_device_irqs() and
> resume_device_irqs()  in drivers/base/power/main.c and see if that changes
> anything?  It's not entirely safe (well, that's why the calls are there after
> all), but hopefully the box won't hang during this test.
>

Tried that against v2.6.30-rc7 and it seems to fix the issue. I did ~10
suspend-resume cycles from the console (which worked just like before)
and ~20 cycles from within X and the trackpad is still alive.

Best,
   Jan Scholz
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