[Bug 266315] linuxkpi panic after recent updates (13.1-STABLE #0 stable/13-9cbba5950: Wed Sep 7 23:42:41 CEST 2022)

From: <bugzilla-noreply_at_freebsd.org>
Date: Fri, 24 Feb 2023 22:45:28 UTC

--- Comment #58 from Paul Dufresne <dufresnep@zoho.com> ---
(In reply to jakub_lach from comment #55)

man intel (on FreeBSD) shows that UXA is default, and I can confirm that from
[    52.583] (II) Module "dri2" already built-in
[    52.583] (II) intel(0): Allocated new frame buffer 1280x1024 stride 5120,
[    52.606] (II) UXA(0): Driver registered support for the following
[    52.606] (II)         solid
[    52.606] (II)         copy
[    52.606] (II)         put_image
[    52.606] (II)         get_image
[    52.606] (II) intel(0): [DRI2] Setup complete
[    52.606] (II) intel(0): [DRI2]   DRI driver: iris
[    52.606] (II) intel(0): [DRI2]   VDPAU driver: va_gl

But on Ubuntu:
default is sna, apparently

There is also "AccelMethod" "blt": (limited UXA)
or "blt" to disable render acceleration and only use the BLT engine

I found info on BLT engine in section of:

You might want to check:
      Option "RelaxedFencing" "boolean"
              This option controls whether we attempt to allocate the minimal
              amount of memory required for the buffers. The reduction in
              working set has a substantial improvement on system performance.
              However, this has been demonstrate to be buggy on older hardware
              (845-865 and 915-945, but ok on PineView and later) so on those
              chipsets defaults to off.

              Default: Enabled for G33 (includes PineView), and later, class
Should be decided by your GPU, but might make sure.

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