linux-kernel - Re: [PATCH] drm/edid: add 8 bpc quirk to the BenQ GW2765

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Message-ID: <ZSkcX1nJ4Ipf2ICd@intel.com>
Date:   Fri, 13 Oct 2023 13:30:55 +0300
From:   Ville Syrjälä <ville.syrjala@...ux.intel.com>
To:     Hamza Mahfooz <hamza.mahfooz@....com>
Cc:     dri-devel@...ts.freedesktop.org,
        Maxime Ripard <mripard@...nel.org>,
        amd-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, Thomas Zimmermann <tzimmermann@...e.de>,
        Alex Deucher <alexander.deucher@....com>
Subject: Re: [PATCH] drm/edid: add 8 bpc quirk to the BenQ GW2765

On Thu, Oct 12, 2023 at 02:49:27PM -0400, Hamza Mahfooz wrote:
> The BenQ GW2765 reports that it supports higher (> 8) bpc modes, but
> when trying to set them we end up with a black screen. So, limit it to 8
> bpc modes.

Bad cable/etc was ruled out as the cause?

> 
> Cc: stable@...r.kernel.org # 6.5+
> Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2610
> Signed-off-by: Hamza Mahfooz <hamza.mahfooz@....com>
> ---
>  drivers/gpu/drm/drm_edid.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index 0454da505687..bca2af4fe1fc 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -123,6 +123,9 @@ static const struct edid_quirk {
>  	/* AEO model 0 reports 8 bpc, but is a 6 bpc panel */
>  	EDID_QUIRK('A', 'E', 'O', 0, EDID_QUIRK_FORCE_6BPC),
>  
> +	/* BenQ GW2765 */
> +	EDID_QUIRK('B', 'N', 'Q', 0x78d6, EDID_QUIRK_FORCE_8BPC),
> +
>  	/* BOE model on HP Pavilion 15-n233sl reports 8 bpc, but is a 6 bpc panel */
>  	EDID_QUIRK('B', 'O', 'E', 0x78b, EDID_QUIRK_FORCE_6BPC),
>  
> -- 
> 2.42.0

-- 
Ville Syrjälä
Intel