At the moment, set acpi_backlight=vendor on GRUB as a workaround, works only with kernel version 3.11.0-14-generic (Ubuntu stable kernel). Set the workaround in the Kernel v3.13-rc5 produce blackscreen at startup. You can see the update and the evolution of the bug here: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1261853 2013/12/23 Aaron Lu <aaron.lu@xxxxxxxxx>: > On 12/22/2013 12:48 AM, Alex Barattini wrote: >> [1.] One line summary of the problem: >> >> 8086:0166 [Dell Inspiron 15R 5521] Impossible to adjust the screen backlight >> >> [2.] Full description of the problem/report: >> >> The change in the level of illumination of the screen, through the >> corresponding option in the control panel, has no effect. > > Does this patch help? > http://www.spinics.net/lists/linux-acpi/msg47755.html > -- 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
