USB devices "double-registering"

schmidtbag · 2018-09-25 12:57:14

My Ryzen build (specs listed in the sig, if that makes a difference to anyone) has been seeing this problem lately, which for a while wasn't that bad but it seems to be slowly getting worse. The problem is every once in a while, a USB device will register a signal twice. For example, if I type the letter D on the keyboard, it will sometimes type "dd" or even "ddd". Sometimes if I play a game and press a button, it'll toggle the action twice (which, depending on the game, can get really annoying). So far it's only really been noticeable with gamepads and keyboards - my mouse (plugged into the keyboard's built-in hub) doesn't appear to have the same problem, but I click the mouse a lot less than I type keys or press gamepad buttons, and I don't think I'd notice this "glitch" by moving the pointer.

Plugging the devices in other USB ports doesn't seem to help, and although I didn't try another keyboard, I did try another gamepad, which had the same problems. I regularly use about 4 different computers and this is the only one with this problem, so I don't think it's a config issue or just shaky fingers.

I would like to point out my CPU is overclocked, but, I have confirmed that the OC is stable. I also didn't tweak the BCLK, specifically because doing that is known to cause USB problems.

Last edited by schmidtbag (2018-09-25 12:58:29)

seth · 2018-09-25 13:52:33

What makes you believe that this is a problem w/ the bus and not eg. w/ libinput?
Do you have input devices that are not wired via USB (ps/2??) and thus don't expose this behavior?
Do you have trouble w/ non-input USB devices (IO errors on drives, printers etc.)?

Do you get the double-entry in "sudo libinput debug-events" or "sudo showkey" on the console (isolate the multi-user.target for the latter test)?

schmidtbag · 2018-09-25 14:00:44

seth wrote:

What makes you believe that this is a problem w/ the bus and not eg. w/ libinput?
Do you have input devices that are not wired via USB (ps/2??) and thus don't expose this behavior?
Do you have trouble w/ non-input USB devices (IO errors on drives, printers etc.)?
Do you get the double-entry in "sudo libinput debug-events" or "sudo showkey" on the console (isolate the multi-user.target for the latter test)?

Thanks for the quick reply

I actually don't think this is specifically a problem with the bus; I legitimately don't know what the problem is, so it very well could be libinput.
I do have a PS/2 keyboard I can try; I haven't done so yet.
So far, other USB devices appear to be working fine (including USB HDDs and flash drives). However, I'm not sure if that's a good metric, since I'm sure there's some error correction involved in that.
I don't have a printer plugged into this computer, but since this problem is so intermittent (it only happens maybe once every 2 or so minutes) I think the chances are pretty slim that this could affect such a device.

I might also try using a webcam and see if I can notice any corruption issues. The tricky part with that is any corrupt pixels would likely only show up in a random spot for a single frame, which would be very hard to detect (again, considering how intermittent this problem is).

Last edited by schmidtbag (2018-09-25 14:02:25)

seth · 2018-09-25 14:17:42

The problem could also be in *hci_hid (usb storage and input use different kernel modules)
If you also have a PS/2 keyboard (and actually still a bus - a ps/2-usb converter won't help ;-), that should be a good indicator (if it happens there as well, it's not USB) and showkey would narrow the thing from the other side (if it doesn't happen there, it's rather libinput)

schmidtbag · 2018-09-25 14:22:28

Haha yeah, of course I couldn't use a PS/2 to USB adapter, but my motherboard does support 1 built-in port, so I'll give that a shot.

But, suppose the PS/2 keyboard proves to behave normally: what do I do next?

Arch Linux

#1 2018-09-25 12:57:14

USB devices "double-registering"

#2 2018-09-25 13:52:33

Re: USB devices "double-registering"

#3 2018-09-25 14:00:44

Re: USB devices "double-registering"

#4 2018-09-25 14:17:42

Re: USB devices "double-registering"

#5 2018-09-25 14:22:28

Re: USB devices "double-registering"

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