linux-kernel - Re: 2.6.29-rc1 does not resume on Lenove T61

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Message-Id: <200901121340.21009.rjw@sisk.pl>
Date:	Mon, 12 Jan 2009 13:40:20 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	"Zdenek Kabelac" <zdenek.kabelac@...il.com>
Cc:	"Maciej Rutecki" <maciej.rutecki@...il.com>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Henrique de Moraes Holschuh" <hmh@....eng.br>
Subject: Re: 2.6.29-rc1 does not resume on Lenove T61

On Monday 12 January 2009, Zdenek Kabelac wrote:
> 2009/1/12 Rafael J. Wysocki <rjw@...k.pl>:
> > On Sunday 11 January 2009, Zdenek Kabelac wrote:
> >> 2009/1/11 Maciej Rutecki <maciej.rutecki@...il.com>:
> >> > 2009/1/11 Zdenek Kabelac <zdenek.kabelac@...il.com>:
> >> >> Hi
> >> >>
> >> >> I've booted and tested 2.6.29-rc1 (c59765042f53a79a7a65585042ff463b69cb248c)
> >> >>
> >> >> I've observed that suspend is unusable - it goes to sleep - the sleep
> >> >> LED is on. After few secs system turns on back itself - and stays in
> >> >> some frozen state
> >> >
> >> > A have similar situation, one difference: I get blank screen during
> >> > resume from suspend to ram. Also sometimes, like You, system turns on
> >> > back itself.
> >> >
> >>
> >> So it looks like reverting this commit:
> >>
> >> http://marc.info/?l=linux-kernel&m=123140019117968&w=4
> >> (6fd9086a518d4f14213a32fe6c9ac17fabebbc1e)
> >> (which is already a tracked regression)
> >> fixes the problem with auto-resume
> >>
> >> But the problem with deadlock in the resume phase is still there.
> >
> > Please check if unloading all of the USB controller modules before suspend
> > helps.
> 
> I've booted to single mode without   usbcore module (thus any load of
> other usb modules fails)
> (removed from initramdisk as well)
> 
> This time the resume stops with these 3 lines (I'm using
> no_console_suspend kernel option):
> 
> ....
> thinkpad_acpi  thinkpad_acpi: EARLY resume
> thinkpad_hwmon  thinkpad_hwmon: EARLY resume
> Enabling non-boot CPUs...

So it seems we have broken CPU hotplug again.

Does disabling/enabling CPU1 using
/sys/devices/system/cpu/cpu1/online work?

If it does, please boot with 'no_console_suspend' in the kernel command line,
run:

# echo core > /sys/power/pm_test
# echo 8 > /proc/sys/kernel/printk
# echo mem > /sys/power/state

and see what happens (you need to have PM_DEBUG set in the kernel .config).

Please send dmesg output generated right after the above (if it works).

Thanks,
Rafael
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