[Bug 93679] Heavy tearing with xf86-video-intel

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93679

Carsten Mattner <carstenmattner at gmail.com> changed:

           What    |Removed                     |Added
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             Status|NEEDINFO                    |REOPENED

--- Comment #11 from Carsten Mattner <carstenmattner at gmail.com> ---
To avoid tearing in videos, xterms and browsers on anything newer than
Sandybridge one has to turn on TearFree and also make use of vsync via a
compositor like compton if they're not already using Wayland. What's more
surprising is that DRI3 was advertised as tear free but it tears like fbcon and
there's no TearFree option in DRI3 and compton's vsync isn't sufficient. This
is a widespread issue and documented in distro wikis like Arch Linux
extensively since those have users who don't run Kwin or Mutter with automatic
compositing+vsync already enabled.

To answer your question, yes the regression persists and it got worse with DRI3
and I have to stay with DRI2 until the general issue is fixed regardless of the
specific GPU revision in the machine from the original bug post. On older GPU
945GM this doesn't happen.

Same tearing happens with generic modesetting ddx and it behaves exactly like
DRI3 in video-intel, all the way down to including different window maximing
behavior in mpv.

My gut feeling is that I'll be able to migrate to Xwayland sooner than this
will be resolved since it exists in the new generic modesetting driver and the
intel driver's dri3 mode, which are both new code (no SNA etc).

I'm really sorry to report this.

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