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Bug report - VNC session always aborts randomly after a few minutes, Android tablet #2081

Closed biojames closed 1 week ago

biojames commented 1 week ago

Describe the bug

The session, whether Ubuntu, Debian, or Arch Linux, either started in VNC graphical mode from the menu or manually from an SSH shell, aborts after a few minutes. This causes either the internal VNC viewer/SSH terminal or an external VNC/terminal application to lose connection.

Steps to reproduce the behavior:

Install Userland version 24.09.23 from Google Play store on a Samsung Galaxy SM-X610 tablet running Android 14

Create new session with Ubuntu, Debian or Arch Linux

Either: Start the VNC session Access the VNC server from within Userland or with an external application (RealVNC/bVNC) Do some stuff After a while it reports 'No connection', kicks off VNC or SSH connections It is impossible to connect by VNC or SSH Can only reset by choosing 'Stop session'

OR

Start an SSH session Start the VNC server manually Start the window manager (LXDE or XFCE) Connect to the VNC server Do some stuff After a while it aborts the SSH and VNC sessions It is impossible to connect by VNC or SSH Can only reset by choosing 'Stop session'

It may or may not be due to the VNC connection (it might be unstable anyway) but I also substituted tigervnc in place of tightvnc and it made no difference

Did not matter if the OS was updated with apt update/apt upgrade or not

Screenshots

N/A - the connection simply aborts

Device Information

Device: SM-X610 Samsung Galaxy S9 FE+ Tablet Android Version: 14 UserLAnd Version 24.09.23 (typo? "Updated on 23 September 2024")
Whether the device is rooted. NOT ROOTED Whether the device is running LineageOS NO

biojames commented 1 week ago

I discovered that this is related to the process killer that runs by default in recent Android releases.

I fixed this as per https://github.com/agnostic-apollo/Android-Docs/blob/master/en/docs/apps/processes/phantom-cached-and-empty-processes.md#commands-to-disable-phantom-process-killing-and-tldr by activating developer options and selecting 

Android Settings -> System -> Developer options -> Disable child process restrictions

It may be worth generating an FAQ item on this if others report the same problem.