[Bug 112014] i915: intel_dp_aux_backlight max_brightness set to incorrect value on Thinkpad P1 Gen2 AMOLED

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=112014

--- Comment #10 from scachemaille <scachemaille at gmail.com> ---
(In reply to Lyude Paul from comment #8)
> (In reply to scachemaille from comment #6)
> > (In reply to Jani Nikula from comment #4)
> > > Does this help?
> > > 
> > > http://patchwork.freedesktop.org/patch/msgid/20190618062628.133783-1-
> > > furquan at google.com
> > 
> > just to be clear.. 
> > I 'm not used about the patch review.. and I'm not sure the version of the
> > patch I tested.. I saw later there was different version.
> > 
> > I tested the patch directly accessible with the link above.
> > 
> > But I don't think it makes much difference.
> 
> Hi! I posted the fixes I was talking about here:
> 
> https://patchwork.freedesktop.org/series/69914/
> 
> Would you mind testing them and letting me know if this fixes your issues?

Hello,

I tested your patches with the Manjaro kernel 5.4rc8.d1117.gaf42d34-1 (I would
have to modify the patches for kernel 5.3.12)
I removed the setting for the options "enable_dpcd_backlight".

rebooted, and the brightness works as intended out of the box. 
I put my laptop in suspend mode, and all works when back to normal mode.
I power off and on my laptop and the brightness value was like as when I turned
it off.

All seems to works.

If you need specifics test. or specific information in return, let me know.

best regards

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