tree f50c3caa93cd33c8317e025511458d147554c57d
parent f700088333c5c7e5a7f4ab71b642362290259e26
author Takashi Iwai <tiwai@suse.de> 1318585540 +0200
committer Keith Packard <keithp@keithp.com> 1319178119 -0700

drm/i915/panel: Always record the backlight level again (but cleverly)

The commit 47356eb67285014527a5ab87543ba1fae3d1e10a introduced a
mechanism to record the backlight level only at disabling time, but it
also introduced a regression.  Since intel_lvds_enable() may be called
without disabling (e.g. intel_lvds_commit() calls it unconditionally),
the backlight gets back to the last recorded value.  For example, this
happens when you dim the backlight, close the lid and open the lid,
then the backlight suddenly goes to the brightest.

This patch fixes the bug by recording the backlight level always
when changed via intel_panel_set_backlight().  And,
intel_panel_{enable|disable}_backlight() call the internal function not
to update the recorded level wrongly.

Cc: <stable@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Reviewed-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Keith Packard <keithp@keithp.com>