Every time I execute this in the /sys/class/backlight/samsung directory: sudo bash -c 'echo 1 > brightness' brightness is reduced a little until it reaches the minimum. After that, every time I execute this: sudo bash -c 'echo 8 > brightness' it increases a little until it reaches the maximum. And each time a message appears in dmesg: "ACPI: Failed to switch the brightness", until the brightness stops changing. At the same time, the little Gnome brightness adjustment window appears, showing the percentage of the brightness, which drops/raises to minimum/maximum in only four executions of these commands. After that, while brightness drops/raises with each execution, the percentage stays at minimum/maximum. Is this all normal?
That sounds like the driver is interfering with the ACPI video driver. Add "acpi_backlight=vendor" to your kernel boot parameters and try again.
-- Regards, Richard SchÃtz -- To unsubscribe from this list: send the line "unsubscribe platform-driver-x86" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
