From: Jani Nikula <jani.nikula@intel.com>
To: intel-gfx@lists.freedesktop.org
Cc: Jani Nikula <jani.nikula@intel.com>,
Daniel Vetter <daniel.vetter@ffwll.ch>,
"# v3 . 17+" <stable@vger.kernel.org>
Subject: [PATCH] drm/i915: fix backlight invert for non-zero minimum brightness
Date: Wed, 31 May 2017 11:33:55 +0300 [thread overview]
Message-ID: <20170531083355.7898-1-jani.nikula@intel.com> (raw)
When we started following the backlight minimum brightness in
6dda730e55f4 ("drm/i915: respect the VBT minimum backlight brightness")
we overlooked the brightness invert quirk. Even if we invert the
brightness, we need to take the min limit into account. We probably
missed this because the invert has only been required on gen4 for proper
operation.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101127
Fixes: 6dda730e55f4 ("drm/i915: respect the VBT minimum backlight brightness")
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: <stable@vger.kernel.org> # v3.17+
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
drivers/gpu/drm/i915/intel_panel.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
index cb50c527401f..bcde9f34527a 100644
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -469,7 +469,7 @@ static u32 intel_panel_compute_brightness(struct intel_connector *connector,
if (i915.invert_brightness > 0 ||
dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
- return panel->backlight.max - val;
+ return panel->backlight.max - val + panel->backlight.min;
}
return val;
--
2.11.0
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next reply other threads:[~2017-05-31 8:30 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-31 8:33 Jani Nikula [this message]
2017-05-31 8:48 ` ✓ Fi.CI.BAT: success for drm/i915: fix backlight invert for non-zero minimum brightness Patchwork
2017-05-31 9:32 ` [PATCH] " Daniel Vetter
2017-08-04 12:42 ` Jani Nikula
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