Yu Watanabe e0504dd011 backlight: fix issue on multiple graphics cards system ...

If a system has multiple graphics cards, then we cannot associate
platform backlight devices to backlight devices under PCI bus.

Previously, in such case, vaidate_device() for a raw backlight device
might erroneously detect a platform device and return false. So, users
could not save/load backlight level.

This makes validate_device() give up to associate platform devices on
non-PCI bus with raw backlight devices. That may cause unwanted
backlight level save or restore by systemd-backlight@.service, but users
can workaround that by masking specific instances of the service.

Closes #24223.

2022-08-17 14:22:43 +09:00

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backlight.c

backlight: fix issue on multiple graphics cards system

2022-08-17 14:22:43 +09:00