inverted brightness for HP notebook

[Jani Nikula]

On Thu, 13 Nov 2014, olivier.fambon at free.fr wrote:
> Hi there,
>
> $ lspci | grep VGA
> 00:02.0 VGA compatible controller: Intel Corporation ValleyView Gen7 (rev 0e)
>
> $ sudo lspci -v -s 00:02
> 00:02.0 VGA compatible controller: Intel Corporation ValleyView Gen7 (rev 0e) (prog-if 00 [VGA controller])
> 	Subsystem: Hewlett-Packard Company Device 2213
> 	Flags: bus master, fast devsel, latency 0, IRQ 107
> 	Memory at 90000000 (32-bit, non-prefetchable) [size=4M]
> 	Memory at 80000000 (32-bit, prefetchable) [size=256M]
> 	I/O ports at 3050 [size=8]
> 	Expansion ROM at <unassigned> [disabled]
> 	Capabilities: [d0] Power Management version 2
> 	Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
> 	Capabilities: [b0] Vendor Specific Information: Len=07 <?>
> 	Kernel driver in use: i915
>
>
> => requires the following to make brightness control keys work as expected
>
> $ cat /etc/modprobe.d/i915.conf 
> options i915 invert_brightness=1

I highly doubt this. This might be true for some gen4 models, but not
Valleyview. Please file a bug on DRM/Intel at [1], and describe the
symptoms.


BR,
Jani.


[1] https://bugs.freedesktop.org/enter_bug.cgi?product=DRI

>
>
>
>
> tested on ubuntu 14.04 (with added xorg conf below)
>
> $ cat /usr/share/X11/xorg.conf.d/20-intel.conf 
> Section "Device"
>         Identifier  "card0"
>         Driver      "intel"
>         Option      "Backlight"  "intel_backlight"
>         BusID       "PCI:0:2:0"
> EndSection
>
>
> Note that the same brightness inversion happened also on ubuntu 14.10 (vanilla install, no xorg conf required)
>
>
> Cheers,
> Olivier.
> _______________________________________________
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> dri-devel at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Jani Nikula, Intel Open Source Technology Center