[Bug 60659] Backlight control interface with nouveau driver for nVidia Quadro 1000m not works

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https://bugzilla.kernel.org/show_bug.cgi?id=60659

--- Comment #9 from Alexey Brodkin <alexey.brodkin@gmail.com> ---
I have exactly the same laptop - HP Elitebook 8560w with a nVidia Quadro 1000M,
NVC1 (GF108) in nouveau slang - and used to suffer from similar issue.

But I've just tried Fedora 20 image for Graphics test day
(http://fedorapeople.org/groups/qa/201310-Graphics_Test-mini-x86_64.iso) and
with "acpi_backlight=vendor" specified I may confirm that in Gnome environment
(it's 3.10) backlight controls work properly.

Indeed without "acpi_backlight=vendor" (which is a default situation) Gnome
shows brightness change animation and
"/sys/class/backlight/acpi_video0/brightness" changes properly, but real screen
brightness doesn't change.

Here's my kernel version information:
==========
Linux localhost 3.11.6-300.fc20.x86_64 #1 SMP Fri Oct 18 22:31:53 UTC 2013
x86_64 x86_64 x86_64 GNU/Linux
==========

Boot command-line (from beginning of dmesg output) is:
==========
Command line: initrd=initrd0.img root=live:CDLABEL=LIVE rootfstype=vfat ro
rd.live.image quiet  rhgb rd.luks=0 rd.md=0 rd.dm=0 acpi_backlight=vendor
BOOT_IMAGE=vmlinuz0
==========

So I assume this bug might be closed now as resolved.
Let me know if there's a need for some more information/testing.

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