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

Alex Deucher alexdeucher at gmail.com
Fri May 2 17:21:59 UTC 2014

On Fri, May 2, 2014 at 12:40 PM, Tim Gardner <tim.gardner at canonical.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.

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