[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 #44 from marianitn <marianoaliaga at gmail.com> ---
(In reply to Jani Nikula from comment #43)
> 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.
> 

OK, I understand your position here, I don't like hacks either. I think I'll
just stick with acpi_backlight until I can upgrade my userland.

> 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.

Maybe someone else can test this, I'm done for now

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