UW2 cards don't like to run at UW2?

[Jeremy Tregunna]

I am also suffering from this same problem. Using a QLogic 1040 with a
36.7GB IBM Ultrastar Ultra160 SCSI drive (should be able to do 80MB just
fine). Information about the hardware is at the end of the message.

When I try to camcontrol negotiate pass0 -R 40 -a it remains at 20MHz and
then when I camcontrol negotiate pass0 -c I now see no frequency at all.
This may just be an issue with the way the hardware works as not reporting
anything after a change, thus camcontrol not reporting anything but it may
not be as well. Either way, I am still at a loss for forcing the card to
40MHz.

isp0: <Qlogic ISP 1020/1040 PCI SCSI Adapter> port 0x8100-0x81ff mem
0x80a35000-
0x80a35fff irq 3 at device 4.0 on pci1
isp0: interrupting at CIA irq 3
da0 at isp0 bus 0 target 8 lun 0
da0 at isp0 bus 0 target 8 lun 0
da0: <IBM DDYS-T36950N S96H> Fixed Direct Access SCSI-3 device
da0: 40.000MB/s transfers (20.000MHz, offset 8, 16bit), Tagged Queueing
Enabled
da0: 35003MB (71687340 512 byte sectors: 255H 63S/T 4462C)