Date:	Sun, 18 Nov 2007 17:40:10 +0100
From:	Tomas Carnecky <tom@...ervice.com>
To:	Pavel Machek <pavel@....cz>
CC:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: laptop reboots right after hibernation

Tomas Carnecky wrote:
> Pavel Machek wrote:
>> Hi!
>>
>>> echo disk > /sys/power/state
>>>
>>> successfully saves that state to the disk, but just as the laptop is
>>> about to turn itself off, it reboots (successfully, so the
>>> hibernation/resume process works well, even with X running! which is
>>> awesome :) ). But I'd rather like the computer turned off after I
>>> hibernate it. Where could the problem be?
>>>
>>> It's a new laptop, TP X61 tablet, I tried ubuntu (7.10, gutsy) for a few
>>> days, both suspend and hibernate worked there (with one or two crashes,
>>> probably due to X, I've read that the intel driver got some
>>> suspend/resume improvements recently). Now I'm running gentoo, kernel
>>> 2.6.24-rc2. I'm using newer versions of almost all software now compared
>>> to the ubuntu system.
>> If it works in older ubuntu, you can probably do bisect. Does normal
>> shutdown work? You can try platform vs. shutdown mode...
>>
> 
> I don't have ubuntu anymore, though I'll try if hibernate works with the
> livecd. One interesting thing I've found out: hibernate reboots the
> laptop _only_ if it is in the docking station. If I hibernate while
> outside of the docking station, it properly shuts down the laptop.
> 
> The default mode seems to be 'platform', after I echoed 'shutdown' to
> /sys/power/disk the notebook correctly shuts down after hibernation!
> 
> Some interesting facts. All tests were done with 2.6.24-rc2, custom
> tailored kernel with just the options needed for my notebook (ThinkPad
> X61 Tablet) - without drm modules and bluetooth but with iwl4965 loaded.
> All tests were done without X running, from the console. If I say
> something 'works' it means I tested it at least three/four times in a
> row (if not even more).
> 
> (1) Both STR and STD work correctly if I keep the notebook outside of
> the docking station (both in platform and shutdown mode).
> 
> (2) Both STR and STD work correctly if I keep the notebook in the
> docking station (both in platform and shutdown mode - with the small
> glitch in platform mode that the notebook won't power off after
> hibernation).
> 
> (3) Once the notebook was in the docking station (whether I boot it
> while in the dock or boot it outside and then put it into the dock) and
> I take it out (press the 'undock' button on the dock, wait for the green
> led, then take out the notebook) things get interesting:
> 
> (a) I initiate STR, notebook correctly goes to sleep, but it only wakes
> up if I have it in the docking station. If I try to wake it up outside
> of the docking station it will fail.

That fails with a non-blinking cursor in the top left screen, just like
in point 3b.

> 
> (b) I initiate STD, and it locks up after a few seconds, at that time
> only the cursor in the top left screen is visible (not blinking). If I
> put the notebook in its locked up state into the dock, it will reboot
> after a few seconds.
> 
> (4) If the notebook is in the dock and I initiate STR and then press the
> undock button, it resumes (I assume that is 'working as intended').
> 
> (5) If the notebook is in the dock, I press the undock button and wait
> for the green led then initiate STR, I can take the notebook out but
> resuming doesn't work - unless I resume it while the notebook is back in
> the docking station (see point 3a)
> 
> (6) If the notebook is in the dock, I press the undock button and wait
> for the green led, then initiate STD:
> 
> (a) in platform mode: I can take the notebook out but resuming doesn't
> work - unless I resume it while the notebook is back in the docking
> station (contrary to point 3b). It seems as the notebook 'locks' itself
> into the docking station during STD, I see the green led change into red
> during the hibernation process (just before heavy HD activity starts).
> 
> (b) in shutdown mode: STD fails with a completely black screen, not even
> the cursor is visible.
> 
> There doesn't seem to be a difference between platform and shutdown mode
> other than the reboot glitch when the laptop is in the docking station
> or as described in point 6.
> 
> tom

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