v3.11-rc2 tested, no change. dmesg files without (dmesg.0) and with acpi_backlight=vendor (dmesg_acpi_backlight_vendor.1) are attached.
v3.11-rc2 tested, no change. vendor (dmesg_ acpi_backlight_ vendor. 1) are attached.
dmesg files without (dmesg.0) and with acpi_backlight=