linux-kernel - Re: Resume from S2R fails after dpm

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Message-ID: <45E833ED.2070402@tpi.com>
Date:	Fri, 02 Mar 2007 07:25:49 -0700
From:	Tim Gardner <timg@....com>
To:	Pavel Machek <pavel@....cz>
CC:	nigel@...el.suspend2.net, linux-kernel@...r.kernel.org,
	Ben Collins <ben.collins@...ntu.com>
Subject: Re: Resume from S2R fails after dpm_resume()

Pavel Machek wrote:
> Hi!
> 
>> I instrumented 2.6.21-rc1 base/power/resume.c device_resume() with
>> TRACE_RESUME(0) as the last statement in the function. Sure enough it
>> was the last hash value in the RTC after a hard reboot when resume failed:
>>
>> [   12.028820]   hash matches drivers/base/power/resume.c:104
>>
>> The machine appears to be absolutely wedged after initiating resume by
>> pressing the power button. The disk flashes for a half second or so,
>> then thats it.
>>
>> It is a Dell XPS, BIOS rev A04. I'm using 'echo 1 > /sys/power/pm_trace;
>> echo mem > /sys/power/state' to initiate the S2R sequence.
>>
>> Any suggestions on where to go from here?
> 
> Did it work ok in 2.6.20? Can you try to get video working/get serial
> console/something?
> 									Pavel

Pavel,

The last version that worked well was Ubuntu Edgy (2.6.17). It was
broken by 2.6.18. I have not started the 'git bisect' process, instead
I've been trying to figure out why it doesn't work in 2.6.21-rc2. Using
the TRACE_RESUME macro I've drilled down to
kernel/printk.c:__call_console_drivers. So far the last trace info that
I have is just before the call to con->write(). I'm trying to figure out
what driver has registered as the console (intel_agp or agpgart?).

Am I banging my head on a known problem?

rtg

-- 
Tim Gardner timg@....com www.tpi.com
OR 503-601-0234 x102 MT 406-443-5357
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