linux-kernel - Re: Linux 4.4.4 [regression]

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Date:	Mon, 7 Mar 2016 18:40:05 +0100
From:	Jörg-Volker Peetz <jvpeetz@....de>
To:	"Deucher, Alexander" <Alexander.Deucher@....com>,
	'Linus Torvalds' <torvalds@...ux-foundation.org>,
	Dave Airlie <airlied@...il.com>,
	DRI mailing list <dri-devel@...ts.freedesktop.org>
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	stable <stable@...r.kernel.org>, "lwn@....net" <lwn@....net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Slaby <jslaby@...e.cz>
Subject: Re: Linux 4.4.4 [regression]

Deucher, Alexander wrote on 03/07/16 17:44:
>> -----Original Message-----
>> From: linus971@...il.com [mailto:linus971@...il.com] On Behalf Of Linus
>> Torvalds
>> Sent: Monday, March 07, 2016 11:21 AM
>> To: Jörg-Volker Peetz; Dave Airlie; DRI mailing list
>> Cc: Greg KH; Linux Kernel Mailing List; Andrew Morton; stable; lwn@....net;
>> Jiri Slaby; Deucher, Alexander
>> Subject: Re: Linux 4.4.4 [regression]
>>
>> On Mon, Mar 7, 2016 at 6:20 AM, Jörg-Volker Peetz <jvpeetz@....de>
>> wrote:
>>>
>>> This same problem with X does happen in 4.5-rc7. And removing the line
>>> introduced by patch b36e52c44ce6728824546d8b5f05b844cede96f1 makes
>> X go again on
>>> my laptop.
>>
>> Ok, so that's dbb17a21c131eca94eb31136eee9a7fe5aff00d9 in mainline.
>>
>> Dave, Alex: that commit makes Jörg-Volker's HP Pavilion dv7 with
>> hybrid graphics (AMD HD 4200 - AMD 5400) unable to run X. No
>> suspend/resume in sight, just starting X hangs.
>>
>> I'd guess it's the "radeon_switcheroo_set_state()" craziness (based on
>> that hybrid graphics thing), but we need to do something since this is
>> a regression.
>>
>> Just revert for now? Or do you have other suggestions for Jörg-Volker to
>> test?
> 
> Can you attach your dmesg output?
> 
I append the dmesg output from 4.5-rc7 (as vacuous as it is) and from my running
system with 4.4.4 without the problematic code line.
Will try your attached patch next.

Regards,
jvp.


View attachment "dmesg-4.5-rc7" of type "text/plain" (47523 bytes)

View attachment "dmesg-4.4.4" of type "text/plain" (49996 bytes)