On Tue, 2009-04-28 at 01:57 +0800, Maxim Levitsky wrote: > I have a notebook which handles brightness keys in hardware, but tells > loudly when it does so. > if you boot into console mode w/o ACPI video driver, does the brightness still change when you press the hotkeys? > Currently, acpi 'video' also sets the brightness, which result in double > setting, and on top of that it emits a key that makes gpm set brightness > again. > we need to support the brightness control in console mode. and "brightness_switch_enabled" should be cleared in graphics mode to prevent the ACPI video driver action upon hotkey events. > And (yes...) on top of that keyboard emits a brightness up/down even, > which (you guessed...) sets brightness again. > > I found out that it is possible to tell gnome-power-manager not to set > brightness, but yet in kernel driver still sets it. > > I found out even earlier that I can use brightness_switch_enabled=0, > which supposed to make inkernel driver not touch the brightness. > But I found out that this driver won't update the brightness, in /sys > interface when I set this param. > No, when "brightness_switch_enabled" is cleared, gdm should still use the ACPI backlight sysfs I/F if available to change the backlight, i.e. /sys/class/backlight/acpi_video0/... what's the model name of your laptop? are you using Intel graphics? please attach the output of acpidump and lspci. It would be great if you can file a bug report about this issue at bugzilla.kernel.org. thanks, rui -- 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
