[ltp] Direct Rendering's affect on battery life?

[Torsten Wolf]

* Laurent Gilson <pumpkin@gmx.de> [06-04-05 17:35]:
>
>1. the DRI/DRM-part of the driver keeps the CPU awake even if there is  
>nothing to do. The CPU will switch to lower frequencies w/o any problems,  
>but it will stay in the first 1-2 C-States. W/o DRI/DRM it can enter C3 or  
>even C4 which reduce the power needed to run the CPU. Have a look at  
>/proc/acpi/processor/CPU/power and the "bus master activity". Optimal for  
>a idle desktop is 00000000.


cat /proc/acpi/processor/CPU/power 
active state:            C3
max_cstate:              C8
bus master activity:     00000000
states:
    C1:                  type[C1] promotion[C2] demotion[--] latency[001] usage[00000010]
    C2:                  type[C2] promotion[C3] demotion[C1] latency[001] usage[11270220]
   *C3:                  type[C3] promotion[--] demotion[C2] latency[085] usage[08844140]

glxinfo
name of display: :0.0
display: :0  screen: 0
direct rendering: Yes

R52, X300, fglrx 8.23.7, 2.6.15

Regards,
Torsten