linux-kernel - Re: Linux 4.4.4 [regression]

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Message-ID: <20160307011419.GB6588@kroah.com>
Date:	Sun, 6 Mar 2016 17:14:19 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Jörg-Volker Peetz <jvpeetz@....de>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	torvalds@...ux-foundation.org, stable@...r.kernel.org, lwn@....net,
	Jiri Slaby <jslaby@...e.cz>,
	Alex Deucher <alexander.deucher@....com>
Subject: Re: Linux 4.4.4 [regression]

On Sun, Mar 06, 2016 at 02:18:31PM +0100, Jörg-Volker Peetz wrote:
> Greg KH wrote on 03/05/16 18:41:
> >
> > Can you use 'git bisect' between 4.4.3 and 4.4.4 to track down the
> > offending patch?
> >
> > thanks,
> >
> > greg k-h
> >
> 
> It's one line of code that freezes X during start on my HP Pavilion dv7 hybrid
> graphic (AMD HD 42000 - AMD HD 5400):
> 
> # git bisect visualize
> commit b36e52c44ce6728824546d8b5f05b844cede96f1
> Author: Alex Deucher <alexander.deucher@....com>
> Date: Tue Nov 24 14:32:44 2015 -0500
> 
> drm/radeon: call hpd_irq_event on resume
> 
> commit dbb17a21c131eca94eb31136eee9a7fe5aff00d9 upstream.
> 
> Need to call this on resume if displays changes during
> suspend in order to properly be notified of changes.
> 
> Signed-off-by: Alex Deucher <alexander.deucher@....com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> 
> Removing the line inserted by this patch from 4.4.4 makes X on my laptop work again.
> Just for the records: with the above patch the laptop freezes during shutdown
> and has to be switched off by pressing the power button several seconds until
> power-off.

Ah, good to know.  Alex, any ideas?

Also, does this same problem also happen in 4.5-rc7?  If so, that's
good.  If not, I'm worried that I might have missed a fixup patch
somewhere.

thanks,

greg k-h