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

[Val Packett]

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@xxxxxxxxxxxxxxxx>
> ---
> 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@xxxxxxxxxxxx> # x1e80100-dell-latitude-7455


~val