[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
bugzilla-daemon at freedesktop.org
Sun Mar 9 05:01:54 PDT 2014
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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