Re: inverted brightness for HP notebook

[Max Manheimer <stiltskin@ymail.com>]

Hi,

Jani Nikula <jani.nikula <at> linux.intel.com> writes:

> On Thu, 13 Nov 2014, olivier.fambon <at> free.fr wrote:

>> $ 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

As there's a specific broadwell i915 module, you have to adapt as follows:

options i915_bdw invert_brightness=1
 
> I highly doubt this. This might be true for some gen4 models, but not
> Valleyview.

The above mentioned i915_bdw option fixes the backlight inversion on my HP
250 G3 (same lspci output as in original post)

So long.
Max

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