Werner Almesberger escreveu:
Did you measure what power saving all this yields in the end ? I've always been wondering if cpufreq will actually make a big difference on our devices, particularly on GTA02, where we run at a more power-efficient speed already by default.
No, I didn't try to measure anything so far. In fact, I'm also wondering how much of a difference it will make.
My plan is to use parts of what has to be done to make suspend work and combine it with cpufreq so the CPU can be always running but in a very low clock speed. For instance, with the cpufreq code so far in the drivers, you have to close the serial ports (after setting up the modem the same way you would do for a suspend) and turn off the screen (currently not possible; the code in the kernel just blanks it) before you can use the slow clock frequencies. Using them should save a lot of power with a faster wakeup than suspend (and as a bonus the userspace keeps running, although somewhat slowly).
-- Cesar Eduardo Barros [EMAIL PROTECTED] [EMAIL PROTECTED]
