drm2 regression: backlight adjustment on ivybridge no longer works

[Ranjan1018 .]

2015-01-24 23:25 GMT+01:00 Adrian Chadd <adrian at freebsd.org>:

> Hi,
>
> I've just found a regression.
>
> The backlight adjustment doesn't work on my ivybridge mobile laptop
> (Lenovo X230) after the dri update.
>
> I've added debugging. It's making it all the way to the pch backlight
> panel update routine in intel_panel.c, but it's not changing the
> backlight appearance itself.
>
> The "intel_backlight" program from intel-gpu-tools" also no longer
> changes the backlight value.
>
> I'm going to finish rebuilding -HEAD on the sandy bridge laptop here
> and try it out.
>
> Thanks,
>
>
>
> -adrian
>

Hi,
I have the same issue on my Samsung Ativ 2 laptop.

Regards,
Maurizio