[Nouveau] [Bug 100446] Backlight control not working on Pascal / GP106 using nouveau drivers

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100446

--- Comment #9 from Bernhard Rosenkraenzer <bero at lindev.ch> ---
Still happens with 4.16.0 final on an hp omen 17-an0xx laptop.

GPU details from lspci:
01:00.0 0300: 10de:1be1 (rev a1) (prog-if 00 [VGA controller])
        Subsystem: 103c:8393
        Flags: bus master, fast devsel, latency 0, IRQ 132
        Memory at db000000 (32-bit, non-prefetchable) [size=16M]
        Memory at b0000000 (64-bit, prefetchable) [size=256M]
        Memory at c0000000 (64-bit, prefetchable) [size=32M]
        I/O ports at e000 [size=128]
        Expansion ROM at dc000000 [disabled] [size=512K]
        Capabilities: [60] Power Management version 3
        Capabilities: [68] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Capabilities: [78] Express Endpoint, MSI 00
        Capabilities: [100] Virtual Channel
        Capabilities: [250] Latency Tolerance Reporting
        Capabilities: [258] L1 PM Substates
        Capabilities: [128] Power Budgeting <?>
        Capabilities: [420] Advanced Error Reporting
        Capabilities: [600] Vendor Specific Information: ID=0001 Rev=1 Len=024
<?>
        Capabilities: [900] #19
        Kernel driver in use: nouveau
        Kernel modules: nvidiafb, nouveau

Additionally, the display doesn't turn on again after an "xset dpms force off"
(bug #103383); this may well be related.

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