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
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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