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+.\" Automatically generated by Pandoc 2.17.1.1
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+.\"
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+.\" Define V font for inline verbatim, using C font in formats
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+.\" that render this, and otherwise B font.
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+.ie "\f[CB]x\f[]"x" \{\
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+. ftr V B
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+. ftr VI BI
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+. ftr VB B
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+. ftr VBI BI
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+.\}
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+.el \{\
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+. ftr V CR
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+. ftr VI CI
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+. ftr VB CB
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+. ftr VBI CBI
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+.\}
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+.TH android-usb-vnc 7 2025-08-17 "dotfiles Android X11 Over ADB"
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+.hy
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+.SH Use Android tablet (or phone) as extra display
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+.PP
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+This dotfiles target uses adb reverse port forwarding and Xvfb to expose an X11
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+display of VNC.
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+.PP
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+The udev rules and systemd units automatically launch an X11 display (:19) via
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+Xvfb, an x11vnc server, and an xpra server shadowing the virtual display.
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+.PP
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+The X11 display persists even when the device is unpluged, allowing the device
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+to replug later and continue using the session on the display.
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+.PP
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+To reduce the attack surface, the x11vnc server runs (on localhost) only while
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+the Android device is connected.
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+.PP
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+The Android device can connect (passwordless) via localhost:5900 using any
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+preferred VNC client.
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+.PP
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+The host can also connect via xpra to work on the virtual display session
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+simultaneously, and long after the Android device is disconnected. This is
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+particularly useful if the host is headless for a while (say, while travelling)
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+and then later has a display attached.
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+.SS adb
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+.PP
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+The Android Debug Bridge is used to forward the x11vnc port (5900) on localhost
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+to the android device. You can install adb via your package manager.
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+.PP
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+Currently only one Android device is supported as the virtual display created
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+via Xvfb is aligned to the resolution of the first connected device.
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+Subsequently connected devices may not have the optimal screen resolution.
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+.PP
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+In the future, virtual displays per-device shall be added. At which point it
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+will be possible to use multiple devices albeit on separate X11 displays.
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+.SS xpra
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+.PP
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+The xpra debian package repos have the latest version, however, I found the
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+packages seem to have missing dependencies:
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+.IP \[bu] 2
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+lz4
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+.IP \[bu] 2
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+python3-opengl
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+.PP
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+You will need to install these debian packages for xpra to work
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+correctly.
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+.PP
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+lz4 is needed to communicate with the spawned xpra server, otherwise you
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+can start one, but can not stop it!
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+.PP
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+python3-opengl is required if you want reasonable performance when you
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+connect to a shadowed display.
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Daniel Sheffield