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

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=266315

--- 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
Xorg.0.log:
[    52.583] (II) Module "dri2" already built-in
[    52.583] (II) intel(0): Allocated new frame buffer 1280x1024 stride 5120,
tiled
[    52.606] (II) UXA(0): Driver registered support for the following
operations:
[    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:
https://manpages.ubuntu.com/manpages/xenial/man4/intel.4.html
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 3.2.2.2 of:
https://www.intel.ca/content/dam/doc/datasheet/atom-d2000-n2000-vol-1-datasheet.pdf

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
              machines.
Should be decided by your GPU, but might make sure.

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