x11/nvidia-driver update to 470.63.01 seems to break GK106GLM [Quadro K2100M]

A few days ago, I returned home from a couple of weeks away (during
which I did not do my usual daily updates to FreeBSD & installed ports).

Yesterday, when I updated my main laptop's stable/12 environment, I
found that the machine did not initialize X11 (I use xdm) as expected;
rather, the screen went blank, and I saw a crash dump (information on
which is in
https://www.catwhisker.org/~david/FreeBSD/stable_12/n233672-a436245ccf1/).

A newer laptop (which I have ... slowly ... been trying to get into
suitable working order) did not exhibit the above symptoms upon
performing the same update.

After noticing that the older/failing laptop had:
g1-55(12.2-S)[1] pciconf -lv | grep -B 2 Quadro
vgapci0@pci0:1:0:0:     class=0x030000 card=0x05cc1028 chip=0x11fc10de rev=0xa1 hdr=0x00
    vendor     = 'NVIDIA Corporation'
    device     = 'GK106GLM [Quadro K2100M]'


while the newer one had:
g1-48(12.2-S)[8] pciconf -lv | grep -B 2 Quadro
vgapci0@pci0:1:0:0:     class=0x030000 card=0x17b01028 chip=0x13b610de rev=0xa2 hdr=0x00
    vendor     = 'NVIDIA Corporation'
    device     = 'GM107GLM [Quadro M1200 Mobile]'

And that x11/nvidia-driver had (during the time I was away) been updated:

commit 1a86bea35222459cae676d18682b85e919f50512
Author: Kevin Bowling <kbowling@FreeBSD.org>
Date:   Sun Aug 15 11:44:34 2021 -0700

    graphics: Make libglvnd a LIB_DEPEND
    
    There are still some incoming reports of dep issues when upgrading
    old systems.  This should help with dep solving and getting past the
    file conflicts.
    
    Reviewed by:    jbeich, x11 (manu)
    Differential Revision:  https://reviews.freebsd.org/D31465

commit 77a2452a895b80a7136d1453ce4ad5fe00b58773
Author: Kevin Bowling <kbowling@FreeBSD.org>
Date:   Tue Aug 10 19:47:16 2021 -0700

    x11/{linux-nvidia-libs,nvidia-driver}: Update to 470.63.01
    
    This is the new stable branch and adds support for Vulkan.
    
    See https://www.nvidia.com/Download/driverResults.aspx/177146/en-us
    and https://www.nvidia.com/download/driverResults.aspx/179601/en-us
    for additional changes.
    
    PR:             257456
    Approved by:    danfe


I tried removing x11/nvidia-driver and installing x11/nvidia-driver-390
instead ... et voilà: working X11 again.

I don't know if this is expected, but figured that some others might
at least be interested, so I'm sharing. :-}

I'm happy to try to help diagnose and/or test, as time & other
resources permit.

Peace,
david
-- 
David H. Wolfskill                              david@catwhisker.org
Life is not intended to be a zero-sum game.

See https://www.catwhisker.org/~david/publickey.gpg for my public key.