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

From	Pavel Machek <pavel@ucw.cz>
Newsgroups	linux.kernel
Subject	Re: da2bc1b9db3351addd293e5b82757efe1f77ed1d breaks hibernation was Re: 4.1-rc7, thinkpad X60: platform mode hibernation does very wrongthing
Date	2015-06-30 11:50 +0200
Message-ID	<pH0kV-6tE-3@gated-at.bofh.it> (permalink)
References	(2 earlier) <pCkNk-1rX-27@gated-at.bofh.it> <pCkX0-1Db-13@gated-at.bofh.it> <pClq2-2qw-25@gated-at.bofh.it> <pCmcq-3AI-19@gated-at.bofh.it> <pCnia-57n-17@gated-at.bofh.it>
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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@intel.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.
> 

-- 
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Re: da2bc1b9db3351addd293e5b82757efe1f77ed1d breaks hibernation was  Re: 4.1-rc7, thinkpad X60: platform mode hibernation does very wrongthing Pavel Machek <pavel@ucw.cz> - 2015-06-30 11:50 +0200

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