Am Sonntag, 8. Oktober 2006 02:03 schrieb David Brownell: > > A simple timeout solution has drawbacks. > > Plus lots of advantages, including the not-to-be-underrated simplicity.
That simplicity means setting up timers in kernel space and determining when a device is "active". You only simplify the interface. > > - there's no guarantee the user wants wakeup (think laptop on crowded table) > > In which case the /sys/devices/.../power/wakeup flag can be > marked as disabled. No wakeup ... but of course, no power > savings either. (One can still unplug the mouse...) I can have suspend without wakeup. It just means that I need to hit a key to make X notice me again. > > - you want to suspend immediately when you blank the screen (or switch to > > a text console) > > Unrelated to USB or any other specific subsystem; the system That is exactly the point. > suspends by "echo mem > /sys/power/state" regardless. (That is, > once the bugs in ACPI, and sometimes drivers, get fixed.) What allows you to assume that I want to suspend the whole system? That power/latency tradeoff is not a policy to be set in kernel. > > - you want to consider all devices' activity. I am not pleased if my mouse > > becomes less responsive just because I used only the keyboard for a > > few minutes. Coordinating this inside the driver is hard as some input > > devices might well be not usb (eg. bluetooth mouse, usb tablet) > > The reasons X11 becomes unresponsive have very little to do with USB > or autosuspend; happens all the time with PS2 mice, trackpads, etc. > Again, those issues are unrelated to USB, or to the API you said you > wanted to see. I did not speak about X11. I can keep X pretty busy with keyboard and touchpad. Nevertheless my mouse has no business going to sleep even if I don't move it and it is the only usb device. ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
