[Bug 253982] Display goes dead with intel_do_flush_locked failed: Input/output error on Dell XPS m1330

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253982

--- Comment #1 from Jan Beich <jbeich at FreeBSD.org> ---
drmn0 warnings suggest you have /boot/kernel/i915kms.ko or /boot/kernel/drm2.ko
loaded (check "kldstat -v" output). graphics/drm-kmod installs
/boot/modules/i915kms.ko and /boot/modules/drm.ko. pkg-message (e.g., run "pkg
info -xD drm-.\*kmod") actually documents you need to use
kld_list="/boot/modules/i915kms.ko" in rc.conf(5) on FreeBSD < 13.0.

If after fixing the confusion drm-kmod is still not stable on i965GM (Intel
Gen4) consider upgrading to FreeBSD >= 13.0 which contains numerious DRM,
LinuxKPI and upstream LTS stability fixes, including for old GPUs.

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