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 10:18:33 +0100
From:   Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
To:     Thomas Voegtle <tv@...96.de>, daniel.vetter@...ll.ch
Cc:     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

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