The following reply was made to PR kern/55198; it has been noted by GNATS.
From: Izumi Tsutsui <tsutsui%ceres.dti.ne.jp@localhost>
Subject: Re: kern/55198: When the video card is Intel Mobile 965GM Express,
i915drmkms has error CPU pipe A FIFO underrun, also X freezes/hangs
Date: Fri, 24 Apr 2020 04:58:13 +0900
Maybe something similar as PR/54995 on Atom N455?
How about adding
> option "AccelMethod" "uxa"
in /etc/X11/xorg.conf ?
If SNA accelaration is problematic on old Intel chips,
maybe we should fallback to UXA on such pre-2010 chipset?