I have ubuntu 10.10 with 2.6.38 kernel and radeon drivers from xorg-edgers ppa.
Works fine except lspci reports 2.5 GT/s for both LinkCap and LinkSta, instead of 5GT/s , which is normal for pcie 2.0 (in windows it works in v2.0 mode fine).
Even checked bits in pci config space, 0x64 and 0x6a reports mode for this card (cap and state), 01 - 2.5 GT/s, 02 - 5 GT/s, I have both - 01
Why is it so?
could you by any chance point to that commit or some hints to find it ?
found it in kernel in evergreen.c
Given the bottlenecks on r600c/g (starving GPU of data on state change), I doubt PCI-e 2.0 will make a noticeable difference, if any. Someone correct me if I'm wrong there.
Still, would be interesting to see a bench on whether double the bandwidth helps r600g.
I would attempt it, but I don't think my lowly RadeonHD 4550 card is the right tool for the job :\Still, would be interesting to see a bench on whether double the bandwidth helps r600g.