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

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Date:   Fri, 13 Oct 2023 07:37:06 -0400
From:   Hamza Mahfooz <hamza.mahfooz@....com>
To:     Ville Syrjälä <ville.syrjala@...ux.intel.com>
Cc:     Maxime Ripard <mripard@...nel.org>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, amd-gfx@...ts.freedesktop.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 10/13/23 06:30, Ville Syrjälä wrote:
> 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?

Yup, the issue was also reproduced by two different people with same
aforementioned monitor.

> 
>>
>> 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
> 
-- 
Hamza