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Rafa? Mi?ecki writes:
Currently we don't try to control backlight after detecting (RHDRegRead(Output, RV620_LVTMA_BL_MOD_CNTL) & LVTMA_BL_MOD_EN) == 0
This assumption is quite wrong, because in some (many?) cases we can just change this one bit and control backlight without problem. Confirmed to work on M82==RV620.
This is possible but there is no guarantee. It could also be controlled by some OEM specific mechanism. In those cases we cannot control backlight, if at all it can be controlled over ACPI. To not expose a backlight property if we cannot control it anyway I had decided to use this check. We could fall back to AtomBIOS controlled backlight in cases where we are not sure as this might be programmed correctly for the system in question - however to implement this would require some extra work as in the hard coded cases the needed data structures have not been set up. Cheers, Egbert. -- To unsubscribe, e-mail: radeonhd+unsubscribe@opensuse.org For additional commands, e-mail: radeonhd+help@opensuse.org