(Sorry for not reporting this sooner - I haven't been running off battery much in the last 3 weeks, so I didn't notice it till now...) Dell Latitude D820 laptop, T7200 Core2 Duo CPU, x86_64 kernel. As reported by 'powertop' on a basically idle machine: 2.6.23-mm1: Cn Avg residency P-states (frequencies) C0 (cpu running) (100.0%) 2.00 Ghz 0.8% C1 0.0ms ( 0.0%) 1.67 Ghz 0.0% C2 0.0ms ( 0.0%) 1333 Mhz 0.0% C3 0.0ms ( 0.0%) 1000 Mhz 99.2% 2.6.23-rc8-mm2: Cn Avg residency P-states (frequencies) C0 (cpu running) ( 0.3%) 2.00 Ghz 0.0% C1 0.0ms ( 0.0%) 1.67 Ghz 0.0% C2 0.0ms ( 0.0%) 1333 Mhz 0.0% C3 31.5ms (99.7%) 1000 Mhz 100.0% In addition, the ACPI power estimate reported about 25 watts for 23-mm1, but only 21 watts for -rc8-mm2, a significant regression. I bisected this down to this set of patches: pm-qos-infrastructure-and-interface.patch pm-qos-infrastructure-and-interface-fix.patch pm-qos-infrastructure-and-interface-vs-git-acpi.patch pm-qos-infrastructure-and-interface-vs-git-acpi-2.patch latencyc-use-qos-infrastructure.patch The patch says: To register the default pm_qos target for the specific parameter, the process must open one of /dev/[cpu_dma_latency, network_latency, network_throughput] As long as the device node is held open that process has a registered requirement on the parameter. The name of the requirement is "process_<PID>" derived from the current->pid from within the open system call. I shouldn't have to have a process open a /dev/file, write a number, and then stay around forever so the file doesn't close in order to get the same behavior I was getting by default before. What needs to happen to get this to not be a behavior regression/change?
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