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@@ -19,11 +19,10 @@
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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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+display over 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, and an xpra server on the virtual display. The xpra server runs an LXQt
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-desktop.
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+The udev rules and systemd units automatically launch an X11 display via Xvfb,
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+and an xpra server on the virtual display. The xpra server runs an LXQt desktop.
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.PP
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The X11 display persists even when the device is unplugged, allowing the device
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to replug later and continue using the session on the display.
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@@ -43,12 +42,21 @@ and then later has a display attached.
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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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+Multiple devices are supported. A separate virtual display is started for each
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+distinct device. Virtual display numbers start from :101 and the next available
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+number is used for each device in the order they are attached. The display
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+remains associated to that device (in case it is replugged later) until next
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+boot.
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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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+The xpra_attach_hdpi.sh helper script can be used to attach to the first such
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+display. A display number can also be specified (eg. xpra_attach_hdpi.sh 102) to
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+attach to a virtual display for a specific device.
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+.PP
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+The mapping from device to display is found in: /var/lib/xvfb
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+.PP
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+NOTE; You may have to set fs.inotify.max_user_instances to a higher
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+value to allow multiple LXQt desktops to run consurrently without warnings about
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+too many open files.
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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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@@ -57,6 +65,8 @@ packages seem to have missing dependencies:
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lz4
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.IP \[bu] 2
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python3-opengl
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+.IP \[bu] 2
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+python3-paramiko
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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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@@ -66,3 +76,6 @@ 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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+.PP
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+python3-paramiko is required if you want to use xxpprrraa uuppggrraaddee or xxpprraa
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+ddeesskkttoopp--uuppggrraaddee
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Daniel Sheffield