Re: Funky Display Output

To: Benny Siegert <bsiegert%gmail.com@localhost>
Subject: Re: Funky Display Output
From: maya%netbsd.org@localhost
Date: Sat, 13 Apr 2019 09:35:27 +0000

I think it's the kernel too. I have a reduced way of reproducing it.
env LIBGL_ALWAYS_SOFTWARE=1 glmark2 (from pkgsrc) will be visibly
corrupt.

env LIBGL_ALWAYS_SOFTWARE=1 ktruss -i glmark2 > /dev/null
or a second glmark2 instance

seemed to make it go away.

I think this difference means it might be under-synchronizing.
tearing should become worse with a second glmark2 instance or with more
load. instead it becomes better.

Anyway, I enabled tearfree by default, so the visible effects should be
gone, but the bug isn't.

References:
- Funky Display Output
  - From: Ron Georgia
- re: Funky Display Output
  - From: matthew green
- Re: Funky Display Output
  - From: Benny Siegert

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