linux-kernel - Re: da2bc1b9db3351addd293e5b82757efe1f77ed1d breaks hibernation was Re: 4.1-rc7, thinkpad X60: platform mode hibernation does very wrongthing

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Date:	Tue, 30 Jun 2015 11:44:55 +0200
From:	Pavel Machek <pavel@....cz>
To:	Paul Bolle <pebolle@...cali.nl>, imre.deak@...el.com,
	ville.syrjala@...ux.intel.com, daniel.vetter@...ll.ch,
	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	linus <linus_torvalds@...mail.com>, lenb <lenb@...nel.org>,
	kernel list <linux-kernel@...r.kernel.org>,
	linux-acpi <linux-acpi@...r.kernel.org>,
	linux-pm <linux-pm@...r.kernel.org>
Subject: Re: da2bc1b9db3351addd293e5b82757efe1f77ed1d breaks hibernation was
 Re: 4.1-rc7, thinkpad X60: platform mode hibernation does very wrongthing

Hi!

> > And this all reminded me of https://lkml.org/lkml/2015/3/18/133 . So I
> > think that's another system not covered by commit ab3be73fa7b4
> > ("drm/i915: gen4: work around hang during hibernation").
> 
> Yes, another system broken by
> 
> commit da2bc1b9db3351addd293e5b82757efe1f77ed1d
> Author: Imre Deak <imre.deak@...el.com>
> Date:   Thu Oct 23 19:23:26 2014 +0300

Imre, your patch already broken 3 machines, and now we discovered it
breakes another. Can you please revert it before it causes more
damage?

Thanks,
									Pavel


>     drm/i915: add poweroff_late handler
> 
>     The suspend_late handler saves some registers and powers off the
>     device,
>         so it doesn't have a big overhead. Calling it at S4
>     poweroff_late time
>         makes the power off handling identical to the S3 suspend and
>     S4 freeze
>         handling, so do this for consistency.
> 	
> 
> And no, adding another system to the "blacklist" is a not good idea,
> because we know there are other broken systems out there. Can we
> revert da2bc1b9db3351addd293e5b82757efe1f77ed1d, please? Consistency
> is nice, but not having regressions is even nicer.
> 									Pavel
> 									
> PS: Now I have real Linus and fake Linus on the Cc list. Or maybe two
> real Linuses, its hard to tell.
> 

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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