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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 DS4PPF11E6CAE14.namprd11.prod.outlook.com (2603:10b6:f:fc02::c) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9611.20; Tue, 24 Feb 2026 02:50:36 +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 15.20.9632.017; Tue, 24 Feb 2026 02:50:36 +0000 Message-ID: <3c473791-5cbb-4ac9-ab9e-0de3b7bd08c1@intel.com> Date: Tue, 24 Feb 2026 08:20:22 +0530 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/8] drm/i915/backlight: Avoid 0 brightness for VESA AUX backlight by default To: Suraj Kandpal , , CC: References: <20260220050217.2453681-1-suraj.kandpal@intel.com> <20260220050217.2453681-2-suraj.kandpal@intel.com> Content-Language: en-US From: "Murthy, Arun R" In-Reply-To: <20260220050217.2453681-2-suraj.kandpal@intel.com> Content-Type: text/plain; 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This confuses the user > into thinking the display is acting weird. This occurs in eDP 1.5 when > we are using PANEL_LUMINANCE_OVERRIDE mode to mainpulate brightness > via luminance values. Make sure if minimum luminance range is 0 we > program default value to max in case 0 is returned from luminance > registers. Changes looks good! Can this header and the patch comment be changed? drm/i915/backlight: use default/max brightness on backlight init If the brightness fetched from VBT/previous state is 0 on backlight initialization, then set the brightness to a default/max value. With the above change Reviewed-by: Arun R Murthy Thanks and Regards, Arun R Murthy ------------------- > Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/15671 > Signed-off-by: Suraj Kandpal > --- > v1 -> v2: > - Let users set brightness to 0, make it so that it's just not > done by default (Arun) > > drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c | 4 ++++ > 1 file changed, 4 insertions(+) > > 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..c40ce310ad97 100644 > --- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c > +++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c > @@ -564,6 +564,8 @@ static int intel_dp_aux_vesa_setup_backlight(struct intel_connector *connector, > } > panel->backlight.level = intel_dp_aux_vesa_get_backlight(connector, 0); > panel->backlight.enabled = panel->backlight.level != 0; > + if (!panel->backlight.level) > + panel->backlight.level = panel->backlight.max; > drm_dbg_kms(display->drm, > "[CONNECTOR:%d:%s] AUX VESA Nits backlight level is controlled through DPCD\n", > connector->base.base.id, connector->base.name); > @@ -573,6 +575,8 @@ static int intel_dp_aux_vesa_setup_backlight(struct intel_connector *connector, > if (current_mode == DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD) { > panel->backlight.level = current_level; > panel->backlight.enabled = panel->backlight.level != 0; > + if (!panel->backlight.level) > + panel->backlight.level = panel->backlight.max; > } else { > panel->backlight.level = panel->backlight.max; > panel->backlight.enabled = false;