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Desktop systems tend not to have battery mode - but IIRC all of the test results in this article were made when running on battery.
UPS counts as battery too there then, I think. Might also be possible to trick the system into thinking it's running on battery with some hackery. (virtual battery whose power level you could change should be interesting for power management benchmarking since then you could see if different power management levels are triggered on different battery levels)
I was under the impression that UPS mode was more like a pending shutdown than a low power mode; or maybe this is something new that I hadn't heard about
Are you saying that "UPS mode" uses the same ACPI messages/whatever as an AC-to-battery transition in a laptop ? Is that separate from the "you might wanna be shutting down before I takes your power away" mode ?
I'd say this is a good start, but I think that the real benefit will come with lowered voltages.
On a related note, is there any way at all to lower the GPU voltage through software in ubuntu? I have to use fglrx because I need ATI powerplay to keep my laptop from getting too hot under normal use. This forces me to use the old LTS ubuntu since my mobility x700 is no longer supported. I would love to upgrade to ubuntu 10.04.
A couple quick notes regarding the current pm state:
- Voltage drop is already implemented for r1xx-r5xx chips in the new pm code
- Some additional asic features (like dynamic sclk and dynamic voltage where the asic scales the clocks/voltage rather than the driver doing it) are also already implemented in the driver for r1xx-r5xx asics. Whether or not these get enabled depends on the flags in the power state entry.
- Most r6xx/r7xx desktop cards have power saving modes