e0504dd011
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.
System and Service Manager
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