linux-kernel - Re: [PATCH v2] drm/edid: add 6 bpc quirk to the Sharp LQ116M1JW10

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <CAD=FV=UoiSAhHOs=HUoGU-kX_ARc_EJP5p7_Ozo7u5vcY33GSg@mail.gmail.com>
Date: Thu, 6 Nov 2025 08:56:04 -0800
From: Doug Anderson <dianders@...omium.org>
To: Ajye Huang <ajye_huang@...pal.corp-partner.google.com>
Cc: linux-kernel@...r.kernel.org, Jani Nikula <jani.nikula@...el.com>, 
	Neil Armstrong <neil.armstrong@...aro.org>, Jessica Zhang <jesszhan0024@...il.com>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
	dri-devel@...ts.freedesktop.org, jazhan@...gle.com
Subject: Re: [PATCH v2] drm/edid: add 6 bpc quirk to the Sharp LQ116M1JW10

Hi,

On Mon, Nov 3, 2025 at 8:38 AM Doug Anderson <dianders@...omium.org> wrote:
>
> Hi,
>
> On Fri, Oct 31, 2025 at 9:01 PM Ajye Huang
> <ajye_huang@...pal.corp-partner.google.com> wrote:
> >
> > The Sharp LQ116M1JW105 reports that it supports 8 bpc modes,
> > but it will happen display noise in some videos.
> > So, limit it to 6 bpc modes.
> >
> > Signed-off-by: Ajye Huang <ajye_huang@...pal.corp-partner.google.com>
> > ---
> > changes from v1->v2:
> > * Change EDID_QUIRK_FORCE_6BPC to BIT(EDID_QUIRK_FORCE_6BPC)
> >
> >  drivers/gpu/drm/drm_edid.c | 3 +++
> >  1 file changed, 3 insertions(+)
>
> There was some extra testing and summarization on the internal
> discussion about this problem that cleared up my confusion and I agree
> that this is the right fix. While the panel does properly link train
> at 8bpp and generally displays images OK, showing certain images on
> the screen displays consistent corruption on just this panel (other
> 8bpp panels are fine). It seems like there's some sort of subtle bug
> in the panel at 8bpp. Limiting it to 6bpp, which is what the panel was
> originally tested with, is the right thing to do.
>
> Reviewed-by: Douglas Anderson <dianders@...omium.org>

Pushed to drm-misc-next:

[1/1] drm/edid: add 6 bpc quirk to the Sharp LQ116M1JW10
      commit: f23e40e378a0858da26e8d5a6f09f82ecd95e247