Description of problem:
I use an USB hub to manage the USB devices on my computer. Notable input
devices are the mouse and the keyboard. Sometimes when plugging in an input
device the input number assigned with that device exceeds the maximum of 32:
Dec 19 20:34:52 perricum kernel: input: Darfon USB Combo Keyboard
Dec 19 20:34:52 perricum kernel: evdev: no more free evdev devices
Dec 19 20:34:52 perricum kernel: input: failed to attach handler evdev to
device input68, error: -23
As a result the keyboard/mouse doesn't work properly: the pressed keys are not
detected right or not at all, and the num-lock light flashes sometimes. This
makes the system unusable.
I attached the entire log output to this bug report: the first message is
generated by attaching the USB hub (new high speed USB device), afterwards I
attached the keyboard (new low speed USB device).
Version-Release number of selected component (if applicable):
$ uname -r
Use the USB hub, connect a keyboard, and check if there are again problems
with the evdev number.
Steps to Reproduce:
1. connect the USB hub
2. connect the keyboard
3. check for the device numbers
The assigned input device number is too high.
It should just work.
This is about external input devices on a laptop - the laptop already has a
touch-pad and a keyboard so in summary these are four input devices. However,
that does not justifies a number like 68! Is there a way to check which
devices were allocated to which number?
Created attachment 290053 [details]
/var/log/messages output during a problematic session
Additional note: the error seems to appear first at the device input number
42. This is easily reproducible by detaching and re-attaching the USB hub
again and again. The device number increases every time by two (because there
are two devices, mouse and keyboard, attached).
I wonder why the device number increases all the time, and why old device
numbers are not used?
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