Input works, display frozen

[babaric-dev]

I do some multitasking on my phone. It got 8GB of RAM, a fairly new chip and it runs smoothly. However, in AVNC, after I leave the app and visit a few minutes later, the display freezes while mouse clicks and keyboard input works. May be related to #92 except it occurs even when RAM usage is around 50%.

[gujjwal00]

Yeah, it could be the same issue as in #92. Are you using termux too? Does it happen randomly or every time?

[babaric-dev]

I use Termux. But it doesn't work if I am connecting to a Linux computer either.

Btw, it happens everytime after I leave AVNC in the background for a few minutes.

[gujjwal00]

Can you tell me a bit more about your setup?

• Host OS name & version
• VNC server name & version
• Android version
• Anything special about your setup (e.g. SSH)

If I can reproduce it locally, that would be really helpful.

---

the display freezes while mouse clicks and keyboard input works

Does the pointer/arrow moves when you click around, or is it frozen too?

[babaric-dev]

Host: Ubuntu 22.04.1 LTS (Termux)
VNC server: tigervnc-standalone-server (1.12.0+dfsg-4)
Guest: Android 13, Samsung (One UI 5)

Special setup:
PhantomProcessKiller is disabled with

settings put global settings_enable_monitor_phantom_procs false

Does the pointer/arrow moves when you click around, or is it frozen too?

I don't really understand the question. Anyway, the cursor on screen moved around and the mouse input to the vnc also respects the local cusor position. In short, it is just the display frozen.

Again, same as #92, this never happened in VNC Viewer by RealVNC Limited. I use AVNC simply it looks nicer and is open-source. :)

Do not hesitate to ask if there are more questions :)

[gujjwal00]

I don't really understand the question. Anyway, the cursor on screen moved around and the mouse input to the vnc also respects the local cusor position. In short, it is just the display frozen.

I was trying to rule out any graphics related issue. AVNC uses OpenGL ES to render the framebuffer received from server. It also draws the pointer icon, mostly an arrow, on current pointer position. When you tap on the screen, trying to send a click to remote server, AVNC will update the pointer position to where you tapped, and will redraw the icon on new position.

When display is frozen, if tapping on screen moves the pointer without updating rest of the stuff, than it means that rendering is working correctly, just the framebuffer is not being updated.

[babaric-dev]

Btw, this bug I am facing isn't related to the Android 13 update. It occurs on Android 10 and 12 as well. So, it pretty much isn't a problem about the Android version.

[gujjwal00]

Thanks.
Can you check if atleast pointer is still movable as I explained above?

[babaric-dev]

I think a visualization of the issue would help. That's why I screen recorded a session with touches shown:

before.mp4

after.mp4

before.mp4: Before leaving AVNC in background
after.mp4: Entering AVNC after a few minutes

Hope this helps so AVNC will get better and better.

[gujjwal00]

Thanks, that's really helpful.

[tuanpham-dev]

Confirming I got this problem sometime.

[gujjwal00]

I will try to reproduce this locally by setting up Termux on my Android 12 device.

@tuanpham-dev using https://github.com/tuanpham-dev/termux-ubuntu should be enough to get started, right?

[tuanpham-dev]

@gujjwal00 - Yes, it should. You also need to disable PhantomProcessKiller to prevent the[Process completed (signal 9) - press Enter] problem.

[babaric-dev]

@gujjwal00 I use proot-distro with XFCE on Ubuntu 22.04.1. Andronix, termux-ubuntu and similar projects should work too.

[babaric-dev]

disable PhantomProcessKiller to prevent the[Process completed (signal 9) - press Enter]

@gujjwal00 Run

/system/bin/device_config put activity_manager max_phantom_processes 2147483647

using ADB. This takes effect until next reboot.