[systemd-devel] [PATCH] backlight: do nothing if max_brightness is 0

[Thomas Bächler]

Am 27.03.2014 23:41, schrieb Thomas Bächler:
> On virtually any newer Asus mainboard, the eeepc-wmi driver is loaded.
> It exposes a backlight device despite the lack of any physical backlight
> devices. This fake backlight device has max_brightness set to 0. Since
> the introduction of the clamp_brightness function, systemd-backlight
> tries to write '1' to brightness and fails.
> 
> This patch changes systemd-backlight to exit gracefully when
> max_brightness is 0 before performing any action. This affects
> both the load and save actions.

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