Mark Hellman wrote:
Thomas Renninger wrote:
If you are interessting to test C-state battery lifetime, which I expect
the culprit of current linux battery life time values... I am going to
work on that soon.
Some more days/weeks..., I come back to you.
I am interested!
I read that some modules may prevent the processor from C3. I have already
unloaded ehci_hcd and uhci_hcd to no avail. The processor doesn't leave C2.
Try to boot with init=/bin/bash boot param
mount /proc
mount /sys
modprobe processor
watch -n1 cat /proc/acpi/processor/*/power
The processor should mostly stay in C3 and bus master activity should be low.
Battery lifetime should be really high (as high as under windows?).
You can now load module by module and watch bus master activity afterwards.
Like that you should be able to find bad modules/hardware
that forces the processor to wake up from C3 or even to not enter C3 which
causes a lot more battery drain.
BTW: I am very interessted about bad modules and how bad they are ...
Thanks,
Thomas
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