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Date: Thu, 9 Jul 2020 18:38:31 -0700 From: Doug Anderson <dianders@...omium.org> To: steev@...i.org Cc: Laurent Pinchart <Laurent.pinchart@...asonboard.com>, Andrzej Hajda <a.hajda@...sung.com>, David Airlie <airlied@...ux.ie>, Bjorn Andersson <bjorn.andersson@...aro.org>, Daniel Vetter <daniel@...ll.ch>, dri-devel <dri-devel@...ts.freedesktop.org>, Jeffrey Hugo <jeffrey.l.hugo@...il.com>, Jernej Skrabec <jernej.skrabec@...l.net>, Jonas Karlman <jonas@...boo.se>, linux-arm-msm <linux-arm-msm@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, Neil Armstrong <narmstrong@...libre.com>, Rob Clark <robdclark@...omium.org>, Rob Clark <robdclark@...il.com>, Sean Paul <seanpaul@...omium.org>, Steev Klimaszewski <steev@...too.org> Subject: Re: [PATCH v3 6/9] drm/bridge: ti-sn65dsi86: Use 18-bit DP if we can Hi, On Thu, Jul 9, 2020 at 6:19 PM Steev Klimaszewski <steev@...too.org> wrote: > > Hi Doug, > > I've been testing 5.8 and linux-next on the Lenovo Yoga C630, and with this patch applied, there is really bad banding on the display. > > I'm really bad at explaining it, but you can see the differences in the following: > > 24bit (pre-5.8) - https://dev.gentoo.org/~steev/files/image0.jpg > > 18bit (5.8/linux-next) - https://dev.gentoo.org/~steev/files/image1.jpg Presumably this means that your panel is defined improperly? If the panel reports that it's a 6 bits per pixel panel but it's actually an 8 bits per pixel panel then you'll run into this problem. I would have to assume you have a bunch of out of tree patches to support your hardware since I don't see any device trees in linuxnext (other than cheza) that use this bridge chip. Otherwise I could try to check and confirm that was the problem. -Doug
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