Am 31.08.2017 01:06 schrieb jingyun@cpu-os.ac.cn:
Hi, Andrey
Q: Do you mean that wakeup by keyboard doesn't work only if PC was suspended by pressing special suspend key on your keyboard?
Answer： No. Wakeup by keyboard doesn't work only if I pressing the keyboard (fast enough) during the suspend. It has nothing to do with suspending method.
Q: And if it was suspended by from operating system or by pressing button on case wakeup by keyboard does work?
Answer: The problem has nothing to do with suspending method. Whatever the suspending method is( from desktop or echo mem > /sys/power/stat ), if I do NOT hit the keyboard during the suspend, then wakeup by keyboard does work. But if I hit the keyboard fast enough during the suspend, then after the suspend the keyboard seems dead. And wakeup by keyboard does NOT work any more.
Thanks for your time.
Jim
-------------------------
FROM: Andrey Skvortsov DATE: 2017-08-30 15:45 TO: jingyun@cpu-os.ac.cn CC: kernelnewbies SUBJECT: Re: USB keyboard can NOT wakeup from S3( suspend to RAM )
On 17-08-16 18:03, jingyun@cpu-os.ac.cn wrote:
hi, there
thx in advance;
I encounter a strange (maybe) bug: During the suspending of my linux box(which runs debian 9), I hit the key of the USB interfaced keyboard; after making sure the box enter suspend state for a while ( which I can tell from the power LED blinks), I can NOT wakeup it by hit that keyboard any more. But if I do NOT hit the key during the suspending, I CAN wake it up by hitting the keyboard.
Do you mean that wakeup by keyboard doesn't work only if PC was suspended by pressing special suspend key on your keyboard? And if it was suspended by from operating system or by pressing button on case wakeup by keyboard does work?
After that I tried Ubuntu 16.04(runs 4.4 version kernel ) and Ubuntu 14.04 ( 3.13 kernel). And I found all of them got the same problem;
Do not know if this is the right place to ask. Just a try.
Thanks again.
Sounds like a bug. Doesn't *have* to be in the kernel though. At least it sounds like pressing buttons "during" suspending resets a state to resumed before it actually suspended - preventing to resume... Is it an ordanary usb keyboard? Could you append the output of lsmod, the modules you are using and lsusb?