Re: i915 visual corruption

[Chavdar Ivanov <ci4ic4%gmail.com@localhost>]

Using the same Intel graphics, I had some perhaps similar effects on
my laptop. In another thread it was suggested to set TearFree to True
and AccelMethod to sna, which I did, the effects disappeared.

On Fri, 12 Apr 2019 at 16:02, <coypu%sdf.org@localhost> wrote:
>
> in the hope of someone else being able to piece together hints:
> kernel & normal userland: 8.99.37 amd64
>
> gpu(1): Intel(R) HD Graphics 530, using i915drmkms
> gpu(2): nVidia GTX 965M (no driver attached, no magic being done)
> legacy boot.
>
> on the ridiculous resolution of 3840x2160.
>
> visual corruption is sometimes apparent:
> env LIBGL_ALWAYS_SOFTWARE=1 glmark2 : corrupt video
> the corrupt lines seem to be the same spot, unless I move the window.
>
> launching a second glmark2 stops the visual corruption.
> killing it immediately restarts it.
>
> this is true even if the second glmark2 instance isn't visible.
>
> Video: https://i.imgur.com/5zOTq6i.mp4
>
>
> (this appears as mild corruption on firefox, but I'm using glmark2 as a
> more better way of reproducing it)



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