[Nouveau] [Bug 103383] "xset dpms force on" does not unblank laptop screen after "xset dpms force off" is run (or system enters sleep mode)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103383

--- Comment #1 from Ilia Mirkin <imirkin at alum.mit.edu> ---
I have some recollection that someone else reported a similar issue with a
GP10x laptop GPU -- the backlight control wasn't working.

Perhaps this is similar. Or perhaps we need to explicitly turn the PANEL_POWER
back on (we do it when initially detecting the panel, but never touch it again
in nouveau_connector.c)

Or perhaps NV_DEVICE_INFO_V0_PASCAL is missing from the switch in
nouveau_backlight.c (it is), although as I was saying, someone was having
trouble with it... see bug #100446.

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