On Thu, Jul 26, 2012 at 11:35:25AM -0400, Alex Deucher wrote: > On Thu, Jul 26, 2012 at 8:58 AM, Luca Tettamanti <kronos.it@xxxxxxxxx> wrote: > > The other missing bit is how to actually change the brightness... Alex, > > do you know what registers to poke? > > You need to check if the GPU controls the backlight or the system > does. I think the attached patches should point you in the right > direction. Yep :) 0050: ATOM_FIRMWARE_CAPABILITY_ACCESS usFirmwareCapability : 0050: (union) ATOM_FIRMWARE_CAPABILITY sbfAccess : USHORT GPUControlsBL:1 = 0x0001 (1) The panel is using the INTERNAL_UNIPHY encoder, and I see the UNIPHYTransmitterControl command table. Interaction with video.ko is still a bit messy... Do you already have code for handling the notifications? I'll work on it in the weekend otherwise ;) Luca -- 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