[Intel-gfx] LPSS backlight control (Dell Venue 8 Pro)

Kumar, Shobhit shobhit.kumar at linux.intel.com
Mon Jan 4 03:50:05 PST 2016

On 01/04/2016 03:12 PM, Jani Nikula wrote:
> On Fri, 01 Jan 2016, "C. B." <cbrookes at gmail.com> wrote:
>> Hello All,
>> Re: http://lists.freedesktop.org/archives/intel-gfx/2015-April/065313.html
>>> Recently I noticed another device Dell Venue 8 Pro (BYT-CR) which
>>> should be using LPSS backlight control. There is already a LPSS PWM
>>> chip driver in upstream kernel which should be used in this case. That
>>> patch is for another day
>> I would like to humbly register my interest in seeing this support
>> added in. I have a Dell Venue 8 Pro running Linux and I'd like to be
>> able to adjust the backlight.
> Shobhit, any thoughts or news on LPSS backlight?

Yeah, this got sidelined by other stuff. Should be doable. Let me get 
back onto this. Will surely need testing support as don't have this 
device with me.


>> I also noticed vbetool dpms control doesn't work either; not sure
>> whether that's related?
> It's expected vbetool does not work with i915. vbetool bypasses the
> driver to access hardware registers owned by i915. It's also unrelated
> to LPSS.
> BR,
> Jani.

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