On Thu, Jul 26, 2012 at 3:42 PM, Alex Deucher <alexdeucher@xxxxxxxxx> wrote: > On Thu, Jul 26, 2012 at 3:33 PM, Luca Tettamanti <kronos.it@xxxxxxxxx> wrote: >> 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 ;) > > I don't have patches for that. Please feel free to work on it :) One thing worth checking, the sbios may write the requested backlight level to the bios scratch reg, in which case the driver only has to execute the BL_BRIGHTNESS action rather than writing the requested level to the register first. Alex > > Thanks, > > Alex -- 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
