CHROMIUM: drm/i915: Enable LVDS downclocking

Enable LVDS downclocking in the intel i915 graphics driver. This
will save approximately 200mW when the screen is idle.

Signed-off-by: Sean Paul <seanpaul@chromium.org>
BUG=chromium-os:9803
TEST=Tested on alex and lumpy

Change-Id: I6fe403c8d9d520901a01549ad6b5eff80de318f3
Reviewed-on: https://gerrit.chromium.org/gerrit/14815
Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>
Commit-Ready: Sean Paul <seanpaul@chromium.org>
Tested-by: Sean Paul <seanpaul@chromium.org>

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 7bc10eb..82395d6 100644 (file)
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -78,7 +78,7 @@ MODULE_PARM_DESC(i915_enable_fbc,
                "Enable frame buffer compression for power savings "
                "(default: -1 (use per-chip default))");
 
-unsigned int i915_lvds_downclock __read_mostly = 0;
+unsigned int i915_lvds_downclock __read_mostly = 1;
 module_param_named(lvds_downclock, i915_lvds_downclock, int, 0400);
 MODULE_PARM_DESC(lvds_downclock,
                "Use panel (LVDS/eDP) downclocking for power savings "