[Bug 80182] [IVB regression] screen not resuming on kernel 3.14.6 and above

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80182

--- Comment #43 from Jani Nikula <jani.nikula at intel.com> ---
Thanks.

Apparently intel_backlight does what the userspace wants, mechanism not policy
and all that, while acpi_backlight, for some reason, did not obey 0 backlight
in this scenario. And we moved from acpi_backlight to intel_backlight on your
hardware. Technically there's no regression in i915, as it works with a sane
userspace, and I'm obviously reluctant to adding hacks in i915 to replicate
policy in acpi.

However we've changed a few things related to backlight power sequencing and
minimum backlight brightness; please see if those help with the old userspace.
The branch to try is drm-intel-nightly at
http://cgit.freedesktop.org/drm-intel.

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