Public bug reported:

Summary: Several models of Medion laptops need to be added to
`/lib/udev/hwdb.d/60-keyboard.hwdb` so that volume keys don't auto-
repeat indefinitely.

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I just installed Xubuntu on a Medion P6689 MD61019 laptop, and it turns
out that pressing the volume keys (Fn-F11/F12) causes them to auto-
repeat indefinitely, increasing/decreasing the volume until reaching
100%/0%.  Same happens with mute (Fn-F10).  Apparently these keys only
send key press events but not key release ones.

It seems that this issue is common in Medion laptops:
* https://askubuntu.com/questions/994333/volume-buttons-stay-pressed
* 
https://askubuntu.com/questions/1048531/volume-control-keys-mute-volume-up-down-auto-repeat-key-presses
* https://bbs.archlinux.org/viewtopic.php?id=233114

For those affected by this bug, I posted a workaround here:
https://askubuntu.com/a/1061500/854656

I've attached the file with the workaround as I have it in my laptop
right now.

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Ubuntu release:  Xubuntu 18.04.1 64b (bionic)
Package version: udev 237-3ubuntu10.3
Laptop model:    Medion P6689 MD61019

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: auto-repeat keyboard keys laptop medion udev volume

** Attachment added: "Lines to add to /lib/udev/hwdb.d/60-keyboard.hwdb 
(possibly with a different :pn pattern)"
   
https://bugs.launchpad.net/bugs/1784903/+attachment/5170491/+files/99-keyboard-medion-vol-fix.hwdb

** Tags added: laptop

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https://bugs.launchpad.net/bugs/1784903

Title:
  Volume keys auto-repeat indefinitely in Medion laptop

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