From 77076c7aac0184cae2d8a358cf6e6ed1f195fe3f Mon Sep 17 00:00:00 2001 From: Aaron Lu Date: Fri, 26 Sep 2014 10:30:08 +0800 Subject: [PATCH] ACPI / i915: Update the condition to ignore firmware backlight change request MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Some of the Thinkpads' firmware will issue a backlight change request through i915 operation region unconditionally on AC plug/unplug, the backlight level used is arbitrary and thus should be ignored. This is handled by commit 0b9f7d93ca61 (ACPI / i915: ignore firmware requests for backlight change). Then there is a Dell laptop whose vendor backlight interface also makes use of operation region to change backlight level and with the above commit, that interface no long works. The condition used to ignore the backlight change request from firmware is thus changed to: if the vendor backlight interface is not in use and the ACPI backlight interface is broken, we ignore the requests; oterwise, we keep processing them. Fixes: 0b9f7d93ca61 (ACPI / i915: ignore firmware requests for backlight change) Link: https://lkml.org/lkml/2014/9/23/854 Reported-and-tested-by: Pali Rohár Cc: 3.16+ # 3.16+ Signed-off-by: Aaron Lu Acked-by: Daniel Vetter Signed-off-by: Rafael J. Wysocki --- Reading git-format-patch failed