[Bug 94245] Lubuntu 1404 Kernel 3.19 the DDI1_BKLTCTL is no signal at S3

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94245

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

           What    |Removed                     |Added
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             Status|NEW                         |NEEDINFO

--- Comment #5 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to shadow from comment #0)
> -- Display connector: HDMI, DP, VGA
> 
> The DDI1_BKLTCTL has output at S3 resume on WIN7 /8, but Lubuntu 1404 Kernel
> 3.19 the DDI1_BKLTCTL is no signal at S3 resume.

What is DDI1_BKLTCTL exactly? Is that some PWM output pin on your board, or in
some display connector?

In any case, per the dmesg and xrandr, your displays are not identified as an
eDP (embedded display port) output. We don't have SoC PWM support for external
displays or other PWM pins.

What is your use case? Is this a somehow misconfigured eDP port, or do you need
the PWM signal for something else?

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