Subject: Re: Linux 4.4.4 [regression]
To: Greg KH <gregkh@linuxfoundation.org>
References: <20160303233415.GA30194@kroah.com> <56DAB98D.6050305@web.de>
 <20160305174147.GB14401@kroah.com>
Cc: linux-kernel@vger.kernel.org, Andrew Morton <akpm@linux-foundation.org>,
        torvalds@linux-foundation.org, stable@vger.kernel.org, lwn@lwn.net,
        Jiri Slaby <jslaby@suse.cz>, Alex Deucher <alexander.deucher@amd.com>
Newsgroups: gmane.linux.kernel.stable,gmane.linux.kernel
From: =?UTF-8?Q?J=c3=b6rg-Volker_Peetz?= <jvpeetz@web.de>
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Date: Sun, 6 Mar 2016 14:18:31 +0100
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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@amd.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@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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.

Regards,
jvp.