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[solved] Re: QEMU USB Tablet is not detected by XOrg on arm64


From: Compilebunny
Subject: [solved] Re: QEMU USB Tablet is not detected by XOrg on arm64
Date: Sun, 9 Jan 2022 22:24:36 -0800
User-agent: SquirrelMail/1.4.23 [SVN]-1.el7.20190710

Figured it out.

Silly me. The user who runs startx was not part of the group "input"

> I am attempting to run Alpine Linux 3.15 in qemu-system-aarch64 on
> Raspberry Pi. The Raspberry Pi is set up with a touchscreen and acts like
> a tablet.
>
> The problem is that I do not get any mouse action on the graphical console
> when I run startx on the guest. Xorg loads, but there is no mouse. While
> "dmesg | grep 1-2" suggests that "QEMU USB Tablet" has been detected and
> given a place in /dev/input, Xorg does not detect it.
>
> /usr/share/X11/xorg.conf.d/40-libinput.conf is set up to identify various
> classes of input devices using "MatchIsTablet", "MatchIsTouchscreen", etc.
>
> Unfortunately, it never identifies QEMU USB Tablet and therefore XOrg does
> not get a pointer.
>
> The host OS is Ubuntu Mate 20.04.3 LTS. This is the most recent long term
> support version of Ubuntu. Setup was performed using virt-manager.
>
> Host software versions:
> qemu (including qemu-system, etc): 1:4.2-3ubuntu6.19
> virt-manager: 1:2.2.1-3ubuntu2.1
> virt-viewer: 7.0-2build1
>
> Guest software versions:
> XOrg X Server: 1.21.1.2
> Libinput: 1.19.2.r0
>
> Virt-manager setup includes:
> Keyboard: Generic USB keyboard
> Tablet: Evtouch USB graphics tablet (absolute movement)
> Display: Spice (also tried with VNC)
>
> Any idea how to make X find and accept the tablet pointer?
>
> -Compilebunny
>
>
>
>


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