linux-kernel - Re: [PATCH 0/4] drm/msm: UBWC-related fixes

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Message-ID: <93940257-95fe-4019-bd38-0891f7c7b322@packett.cool>
Date: Sun, 18 Jan 2026 19:49:47 -0300
From: Val Packett <val@...kett.cool>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
 Rob Clark <robin.clark@....qualcomm.com>, Dmitry Baryshkov
 <lumag@...nel.org>, Abhinav Kumar <abhinav.kumar@...ux.dev>,
 Jessica Zhang <jesszhan0024@...il.com>, Sean Paul <sean@...rly.run>,
 Marijn Suijten <marijn.suijten@...ainline.org>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
 Konrad Dybcio <konradybcio@...nel.org>, Vinod Koul <vkoul@...nel.org>,
 Stephan Gerhold <stephan.gerhold@...aro.org>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
 freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/4] drm/msm: UBWC-related fixes

On 1/17/26 3:35 AM, Dmitry Baryshkov wrote:

> Fix several bugs, possibly causing image corruption when using UBWC with
> the drm/msm driver.
>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
> ---
> Dmitry Baryshkov (4):
>        drm/msm/mdss: correct HBB programmed on UBWC 5.x and 6.x devices
>        drm/msm/dpu: offset HBB values written to DPU by -13
>        drm/msm/dpu: program correct register for UBWC config on DPU 8.x+
>        drm/msm/dpu: fix SSPP_UBWC_STATIC_CTRL programming on UBWC 5.x+

Thanks, seems to fix the 
https://gitlab.freedesktop.org/drm/msm/-/issues/79 issue for me:

- disabled the workaround (`debug { disable-direct-scanout }` in Niri's 
config) i.e. enabled direct scanout
- opened System Shock Remake in full screen on the external 3840x2560@60 
monitor
- everything looks fine, the right half of the screen does not show any 
alpha artifacts


Tested-by: Val Packett <val@...kett.cool> # x1e80100-dell-latitude-7455


~val