On Sat, 2009-06-27 at 17:57 -0400, Robert Krakora wrote: > Andy: > > I too care about the environment. I am trying to find some extra time > to figure out if my KWorld 330U USB TV devices are actually going into > low power mode or not. I would say not as they get really hot, so I > unplug them when I am not using them. I told Devin I would work on > this and I have an accurate analog amp meter, but I got very busy at > work and at home with the kids. However, I don't believe that the > answer is to disable power management as some of these parts get so > hot that leaving them in a powered state and tuned to a channel will > probably damage the device. Remember, these are silicon tuners, not > the old discrete tuners that have way more surface area to dissipate > heat. Oh, I'm not against power management. But state is lost - somethings that's fixable with a lot of work apparently. I was thinking maybe the V4L2 spec could change. I was also pondering maybe the final close() shouldn't be the trigger for powering devices down. How about the final close() + 30 seconds? Or the final close() + some user set interval. It seems like scheduling delayed work to do something like that should be easy enough. That would require a spec change about state being only preserved until power management powered the thing down and probably an additional ioctl() added to set the powerdown delay. The driver could probably default delay to some interval that would be good for most users. I don't know. Just ideas... Regards, Andy -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
