linux-kernel - Re: v4.14/v4.15-rc1: deferred setup in drm/fb-helper breaks entering pc3

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Date:   Tue, 28 Nov 2017 10:30:32 +0100 (CET)
From:   Thomas Voegtle <tv@...96.de>
To:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
cc:     daniel.vetter@...ll.ch, liviu@...au.co.uk, john.stultz@...aro.org,
        treding@...dia.com, linux-kernel@...r.kernel.org
Subject: Re: v4.14/v4.15-rc1: deferred setup in drm/fb-helper breaks entering
 pc3

On Tue, 28 Nov 2017, Maarten Lankhorst wrote:

> Op 27-11-17 om 19:09 schreef Thomas Voegtle:
>>
>> Hello,
>>
>> with v4.14 I recognized that my file server (headless haswell system)
>> doesn't enter packages pc3 anymore and only enters pc2 according to
>> powertop.
>> In v4.13 the system used pc2 and pc3.
>>
>> So I bisected that down to:
>>
>> ca91a2758fcef6635626993557dd51cfbb6dd134 is the first bad commit
>> commit ca91a2758fcef6635626993557dd51cfbb6dd134
>> Author: Daniel Vetter <daniel.vetter@...ll.ch>
>> Date:   Thu Jul 6 15:00:21 2017 +0200
>>
>>     drm/fb-helper: Support deferred setup
>>
>>
>> Reverting this commit on top of v4.14 and v4.15-rc1 fixes the problem and
>> the system uses package states pc2 and pc3 again.
>>
>> Nothing is connected to the VGA and DVI port.
>> I'm using a kernel without modules on openSUSE 42.3.
>> I have no "vga=xxx" or something like that on the cmdline.
>>
>>
>> Thanks,
>>
>>       Thomas
>>
> Could you send some logs with drm.debug=0x1f ?
>
> ~Maarten

dmesg attached.
View attachment "dmesg.4.15-rc1.txt" of type "text/plain" (70767 bytes)