> By default the brightness values are set to 10 (max_brightness) but changing any of them does not do anything (display stays at maximum brightness level). > > Do you have an idea what could be missing? [...] > I used acpi_backlight=vendor and /sys/class/backlight/asus-nb-wmi shows up > as expected. > > Also the kernel code that sets the brightness value in the asus-nb-wmi > driver works (no error is returned, also the changed values show up in > sysfs). > It just does not seem to get applied. > > I found out that if after I switch to the console (alt+F1) changing the > brightness in sysfs suddenly does have an effect. > > Since I use the proprietary nvidia driver (for full OpenGL 3D support) I > suspect that it has something to do with it. > I tried the Kubuntu Live installer CD which uses nouveau and changing the > brightness works for Xorg there, too (even using the generic acpi_backlight > code and the brightness value in acpi_video1). > > I guess the Nvidia driver or something related to it is doing something > nasty here which keeps the brightness from being applied. > Switching back to Xorg from the console resets the value to 10 (I added some > debug output to update_bl_status) so that's not a workaround unfortunately. > > Since I have no idea what actual piece of hardware controls the backlight I > wonder if it is part of the NVidia hardware and as soon as the nvidia driver > takes over it will no longer accept updates from the BIOS? Unfortunatly I didn't found anything in the DSDT. CCing Zhang Rui, maybe he can help us here. -- Corentin Chary http://xf.iksaif.net -- 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
