after changing from fglrx to xf86-video-ati on my HD 4670 Games like Nexuiz were jerking a bit. So I decided to overglock my GPU a bit.
For that I used atiflash on a USB-Stick and RBE in a virtual machine. I changed everything from 750 to 800, saved the new BIOS on the USB-Stick, bootet from it and flashed.
After that I had a look at /sys/kernel/debug/dri/0/radeon_pm_info but it is still showing me 750 mHz:
The strange thing is that nexuiz isn't jerking anymore but I didn't change anything other than the BIOS.
default engine clock: 750000 kHz
current engine clock: 749250 kHz
default memory clock: 800000 kHz
current memory clock: 796500 kHz
voltage: 1250 mV
PCIE lanes: 16
So my question is: Is the information from /sys/kernel/debug/dri/0/radeon_pm_info valid? Has anybody running a card with modified BIOS and can check this?
P.S. Sorry for my bad english.