Alex Deucher <alexdeucher <at> gmail.com> writes: > > On Thu, Jul 26, 2012 at 8:58 AM, Luca Tettamanti 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. > > Alex > Hi, thank you very much for patches. With these patches now I'm able to adjust brightness on my notebook HP EliteBook 8460p with Radeon 6470M card via file /sys/class/backlight/radeon_bl/brightness It has only one problem: When I enable Ambient Ligth Sensor via hp-wmi.ko driver (echo 1 > /sys/devices/platform/hp-wmi/als which auto adjust some brightness level based on sensor data on HW level) and I set radeon brightness to 0 or 255 (min or max value) screen is turned off. Values 1..254 are OK. What about to disable values 0 and 255 in radeon brightness driver? -- 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
