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.
Thank you. I see the point.
2017-03-05 17:20 GMT+09:00 Herminio Hernandez Jr.
<herminio.hernandezjr@gmail.com >:
> 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