linux-kernel - Re: Lenovo x120e resume regression in 3.15-rc1 bisected to 'drm/crtc-helpers: fix dpms on logic'

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Date:	Fri, 2 May 2014 13:21:59 -0400
From:	Alex Deucher <alexdeucher@...il.com>
To:	Tim Gardner <tim.gardner@...onical.com>
Cc:	Daniel Vetter <daniel.vetter@...ll.ch>,
	Dave Airlie <airlied@...hat.com>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	Maling list - DRI developers 
	<dri-devel@...ts.freedesktop.org>,
	LKML <linux-kernel@...r.kernel.org>,
	kernel-team <kernel-team@...ts.ubuntu.com>
Subject: Re: Lenovo x120e resume regression in 3.15-rc1 bisected to
 'drm/crtc-helpers: fix dpms on logic'

On Fri, May 2, 2014 at 12:40 PM, Tim Gardner <tim.gardner@...onical.com> wrote:
> I've bisected a resume regression on a Lenovo x120e to
> 177cf92de4aa97ec1435987e91696ed8b5023130 (drm/crtc-helpers: fix dpms on
> logic). Everything works fine with this patch reverted on top of
> 3.15-rc3. I realize it is correcting a coding error that has been in
> place since 3.11, but it is also causing this laptop to resume to a
> black screen wherein the platform appears to be locked up (no console,
> no network). See attached bisect log and lspci. The BIOS version is 1.15.
>

Does the attached patch help?  I haven't had a chance to unwind all
the logic in the crtc helper code.

Alex

View attachment "0001-drm-radeon-force-connector-dpm-state-to-ON-on-modese.patch" of type "text/x-diff" (1219 bytes)