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mx.microsoft.com 1; spf=pass smtp.mailfrom=intel.com; dmarc=pass action=none header.from=intel.com; dkim=pass header.d=intel.com; arc=none Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=intel.com; Received: from IA0PR11MB7307.namprd11.prod.outlook.com (2603:10b6:208:437::10) by LV3PR11MB8460.namprd11.prod.outlook.com (2603:10b6:408:1b4::5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9611.16; Wed, 18 Feb 2026 08:35:37 +0000 Received: from IA0PR11MB7307.namprd11.prod.outlook.com ([fe80::9d4a:f89:f548:dbc7]) by IA0PR11MB7307.namprd11.prod.outlook.com ([fe80::9d4a:f89:f548:dbc7%6]) with mapi id 15.20.9632.010; Wed, 18 Feb 2026 08:35:37 +0000 Message-ID: <56cae45c-3122-42a3-bf30-180c5a4f0135@intel.com> Date: Wed, 18 Feb 2026 14:05:30 +0530 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/8] drm/i915/backlight: Avoid 0 brightness for VESA AUX backlight To: Suraj Kandpal , , CC: References: <20260213091653.2250887-1-suraj.kandpal@intel.com> <20260213091653.2250887-2-suraj.kandpal@intel.com> Content-Language: en-US From: "Murthy, Arun R" In-Reply-To: <20260213091653.2250887-2-suraj.kandpal@intel.com> Content-Type: text/plain; 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This occurs in eDP 1.5 when > we are PANEL_LUMINANCE_OVERRIDE in PANEL_LUMINANCE_OVERRIDE > mode to mainpulate brightness via luminance > values. Make sure if minimum luminance range is 0 we program > it to 10% of max luminance range. 0 nits for OLED panel is a valid value right? Instead better to have a default brightness if no brightness is parsed from the vbt and the default brightness can be max_brightness. Thanks and Regards, Arun R Murthy -------------------- > > Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/15671 > Signed-off-by: Suraj Kandpal > --- > .../gpu/drm/i915/display/intel_dp_aux_backlight.c | 14 +++++++++++--- > 1 file changed, 11 insertions(+), 3 deletions(-) > > diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c > index eb05ef4bd9f6..f1811beee25f 100644 > --- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c > +++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c > @@ -456,7 +456,11 @@ static u32 intel_dp_aux_vesa_get_backlight(struct intel_connector *connector, en > } > > val |= buf[0] | buf[1] << 8 | buf[2] << 16; > - return val / 1000; > + val = val / 1000; > + if (!val) > + return panel->backlight.min; > + > + return val; > } > > return connector->panel.backlight.level; > @@ -557,10 +561,14 @@ static int intel_dp_aux_vesa_setup_backlight(struct intel_connector *connector, > if (panel->backlight.edp.vesa.info.luminance_set) { > if (luminance_range->max_luminance) { > panel->backlight.max = panel->backlight.edp.vesa.info.max; > - panel->backlight.min = luminance_range->min_luminance; > + if (luminance_range->min_luminance) > + panel->backlight.min = luminance_range->min_luminance; > + else > + panel->backlight.min = (luminance_range->max_luminance * 10) / 100; > + > } else { > panel->backlight.max = 512; > - panel->backlight.min = 0; > + panel->backlight.min = 51; > } > panel->backlight.level = intel_dp_aux_vesa_get_backlight(connector, 0); > panel->backlight.enabled = panel->backlight.level != 0;