[Bug 92866] intel_backlight doesn't work with i915 Haswell

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92866

Jani Nikula <jani.nikula at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |RESOLVED
         Resolution|---                         |INVALID

--- Comment #13 from Jani Nikula <jani.nikula at intel.com> ---
This bug just got so confusing and misleading so fast that I will close this
one right now, and kindly ask you to file new, clear bug reports with *one*
issue and *one* platform per bug that you have. There are too many things
conflated here now.

Don't report bugs about vbetool or its use.

The bug report was (or at least I thought it was) originally about Haswell, but
all the attached dmesgs are captured on a Valleyview. That particular
Valleyview has a VBT (video bios table) that says the machine does *not* have
backlight at all. Indeed we don't detect eDP or LVDS on it, so it's natural
that there's no backlight. (Maybe that is a bug in your perspective as well,
but it has to be a separate one.)

Comment #12 also brings up a Pineview.

We don't really know or care about the congatec vs. advantech BIOS versions;
please refer to the hardware platforms.

In comment #3 I asked you to write to the "brightness" attribute to check
whether intel_backlight works. Not acpi_backlight nor bl_power. I didn't ask
you to try bl_power on purpose because it's confusing. 0 means on, and 4 means
off.

So let's start afresh.

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