[Bug 73156] Dual onboard LCD (eDP1 and DP1) cannot turn on DP1 (no backlight), no backlight control but can see screen in reflected light

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73156

--- Comment #17 from Axel <tall_axel at web.de> ---
Hi Jani,

thanks for catching my bug report.
In response to your question in
https://bugzilla.kernel.org/show_bug.cgi?id=68631#c11

When I boot in normally, without setting the `vendor` flag for acpi_backlight,
I can change the *inner* display by setting `acpi_video0/brightness` (with
echo).

Setting `asus-nb-wmi/brightness` (booted in with `acpi_backlight=vendor`)
changes nothing for me (not even the inner display). But the value stored in
brightness changes (checked with cat).

As I posted earlier in the kernel.org thread, introducing a second
`/sys/class/backlight` entry like `acpi_video1` for the outher display might be
useful? :)

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