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Date: Sat, 17 Jan 2015 16:43:50 +0100
From: Andreas Tobler <andreast-list@fgznet.ch>
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To: Bob Willcox <bob@immure.com>, FreeBSD Ports <freebsd-ports@freebsd.org>
Subject: Re: CURRENT breaks loading of nvidia.so
References: <20150117151806.GE91189@rancor.immure.com>
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On 17.01.15 16:18, Bob Willcox wrote:
> Yesterday when I upgraded my current box I encountered this failure when
> attempting to load the nvidia-driver (nvidia.so):
>
> link_elf_obj: symbol _callout_stop_safe undefined
> linker_load_file: Unsupported file type
>
> So, today I updtated my system again today hoping it might be fixed but the
> problem persists.
>
> System info:
>
> FreeBSD han.immure.com 11.0-CURRENT FreeBSD 11.0-CURRENT #4 r277299: Sat Jan 17 08:52:41 CST 2015     bob@han.immure.com:/usr/obj/usr/src/sys/HAN  amd64

I think you have to rebuild the nvidia-driver against your fresh built 
system. At least I had and my T510 s working again with the nvidia.ko.

Gruss,
Andreas