I'm very interested in 7000 series feature called "zerocore" which puts the card in a sort of standby mode when screen goes blank.
I have note been able to find any input regarding zerocore support under linux runing FGLRX.
Does anyone has information about zerocore support under GNU/linux?
Any help would be much appreciated!
just testet it on hd7750 and fglrx 12.9 ,ubuntu 12.04, ASPM on
with code: "xset dpms force off"
whole computer measured:
idle: around 43W
idle monitor off: around 42W
dont know if that 1W accounts to zerocore or something else related
aspm activated did lower it around 6W in idle though
Power up your machine. Put it into lowest power state as you can. Measure it.
Reboot, set in BIOS/UEFI - continue on all errors.
Open the machine, remove GPU completely. Reboot. If it boots till sound, measure - thats raw performance without GPU.
It doesn´t play any role if Xorg was started or no, main point is cpu-governor should start and that happens if kernel and init system work.
You can make a daemon to create some random file at end of the boot as confirmation that machine did boot.
the hd7750 idles around 5W
zerocore reduces that to 3W
so my 1W less finding may be the zerocore deepest state cause they used an active cooler version there(+1W?) an i have a passive card.
but doas it matter?
0,002kW*24h*365d*0,25cent/kWh=4,38€ /year difference if its idle all the time