Hi, There are some unfunny cases, when ACPI can not be used for controlling backlight level. Example can be my Sony VAIO (http://bugzilla.kernel.org/show_bug.cgi?id=11682) where bl control doesn't work with sony-laptop. This notebook has ATI GPU that is responsible for backlight level. So we have to implement that in radeon module, which has access to card and can just use register/AtomBIOS to manage backlight. Of course KMS is perfect place for that. However we don't want to play with controlling backlight when there is specific vendor driver for that. Many notebooks are well supported by sony-laptop (and other modules) and in these cases we don't want to change that. Is there some way of detecting if there is vendor-specific driver that cares backlight? Or can we register bl device with some low priority, so when acpi module registers with higher, it will be used? Hope you understand what I mean. Using anything like is_backlight_dev_already_registered is not enought, as we can not be sure which kernel module will be loaded first. -- Rafał -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
