Per the radeon man page *here
*However this option has been removed after 10.2. Under Linux the you
set it in yaboot bootloader by using 'radeon.agpmode=-1'. I do not
know if this will work in loader.conf

  *Option* *"BusType"*  *"**string**"*
              Used  to  replace  previous ForcePCIMode option.  Should only be
              used when driver's bus detection is incorrect  or  you  want  to
              force an AGP card to PCI mode. You should NEVER force a PCI card
              to AGP bus.
              PCI    -- PCI bus
              AGP    -- AGP bus
              PCIE   -- PCI Express bus
              (used only when DRI is enabled)
              The default is *auto* *detect.*

On Sun, Mar 5, 2017 at 3:35 PM, Hiroo Ono (小野寛生) <> wrote:

> Thank you. I see the point.
> 2017-03-05 17:20 GMT+09:00 Herminio Hernandez Jr.
> <>:
> > Try to force the Radeon driver into PCI mode. Under Linux doing this
> stops
> > the blank screen and locks.
> Could anyone tell me how to do it? Can it be done from FreeBSD?
> I googled a little but could not find anything useful (maybe search
> words were not
> appropriate), so how to do it on Linux helps me also.
> pciconf -lc says:
> vgapci0@pci0:0:16:0: class=0x30000 card=0x41501002 chip=0x41501002
> rev=0x00 hdr=0x00
>   cap 02[58] = AGP v3 8x 4x SBA disabled]
>   cap 01[50] = powerspec 2 supports D0 D1 D2 D3 current D0
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