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Date:      Wed, 22 Apr 2020 16:08:25 -0700
From:      Kevin Oberman <rkoberman@gmail.com>
To:        "freebsd-x11@freebsd.org" <x11@freebsd.org>
Subject:   Possible issue with current and 12-STABLE locking up when DRM started
Message-ID:  <CAN6yY1tNpB=hPcdVSgrcqE0-Tdyzog=_uUbfZ=kpyhoyinJ4Kg@mail.gmail.com>

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I have seen multiple reports of systems locking up with a blank screen when
starting X or when booting. I may have found a clue... or maybe it's not
related.

Back on April 2, Hans committed r359727 which was MFCed to 12-STABLE on
April 15 as r359957. This modified locking on the linux KPI. With that
update, I can no longer get DRM to run. Since I use startx to run X, I see
this as a blank screen when the console is transitioned from vga to fb.

I opened 245837 as a kernel issue, but it is also possible that it exposed
some race issue in the DRM code. It contains what few details I have
available.
--
Kevin Oberman, Part time kid herder and retired Network Engineer
E-mail: rkoberman@gmail.com
PGP Fingerprint: D03FB98AFA78E3B78C1694B318AB39EF1B055683



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