Control: affects -1 xorg
Control: severity -1 grave
Severity: grave
Justification: renders package unusable

Thanks, I also figured this out myself separately by running `libinput 
debug-events`, hopefully this helps someone else stumbling upon this strange 
behaviour in the future.

However I am still confused to on how I managed to fix it. On one machine (the 
AMDGPU one) `libinput debug-events --verbose` would complain about certain 
devices not being initialised by udev, including the keyboard device. Upgrading 
udev from version 243-5 to 243-7 and reloading udev by running `udevadm control 
--reload-rules && udevadm trigger` and then restarting lightdm worked. Perhaps 
this bug is related to #944586?

Then again, on the other machine (Intel graphics) it was sufficient to simply 
run `libinput debug-events --device $device`.

Oh and another thing for people wanting to play around with this, when you run 
`systemctl disable lightdm` and then fix the problem and then run `systemctl 
enable lightdm` the latter does not work for some stupid reason, even though 
the former command worked. You have to run `dpkg-reconfigure lightdm` to make 
it work again.

X

Sven Joachim:
> Control: reassign -1 udev 243-5
> Control: forcemerge 944675 -1
> 
> On 2019-11-16 03:45 +0000, Ximin Luo wrote:
> 
>> Package: xorg
>> Version: 1:7.7+20
>> Severity: important
>>
>> Dear Maintainer,
>>
>> After upgrading a bunch of packages on two very different machines, X no 
>> longer
>> responds to keyboard or mouse input.
>>
>> I am using lightdm with XFCE, the problem is present both in the lightdm 
>> login
>> menu and also in XFCE when using `startx` directly.
>>
>> Nothing obvious is in the kernel or system logs or Xorg.0.log.
> 
> That seems to be bug #944675 in udev.
> 
> Cheers,
>        Sven
> 


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