After a fresh install of 4.1 on thinkpad x230, I am trying to install sys-gui-gpu. I run into issue regarding sys-usb-input-proxy having conflicting ID in SLS.
So here are some steps that lead to error 
[user@dom0]$ sudo qubesctl top.enable qvm.sys-gui-gpu
local:
---------------
qvm.sys-gui-gpu.top:
-----------
status:
unchanged
[user@dom0]$ sudo qubesctl top.enable qvm.sys-gui-gpu pillar=True
local:
---------------
qvm.sys-gui-gpu.top:
-----------
status:
unchanged
[user@dom0]$ sudo qubesctl --all state.highstate
local:
Data failed to compile:
--------------
Detected conflicting IDs, SLS IDs need to be globally unique.
The conflicted ID is 'sys-usb-input-proxy' and is found in SLS 'base:qvm.sys-usb' and 'base:qvm.sys-gui=gpu'
DOM0 configuration failed, not continuing
Some background context, my usb qubes is most of the times not booting automatically. I have deleted and re-installed it but no changes.
I have managed to make sys-gui works before and disable and deleted it afterwards.
I have a feeling that the issue is lying around the usb…anyone got a hint on it ?