VNC on startup shows black screen on Fedora 25, manually starting "vncserver" works

tanbir91 · 09-15-2021, 01:01 PM

Hi All,

I used to run FC19 earlier, and used to edit "etc/systemd/system/vncserver@:1.service.
Changes made in the original file (assuming, I am user "root"):

Code:

ExecStart=/sbin/runuser -l root -c "/usr/bin/vncserver %i"
ExecStop=/sbin/runuser -l root -c "/usr/bin/vncserver -kill %i"
PIDFile=/root/.vnc/%H*%i.pid

Then, issue the following commands:

Code:

vncpasswd

systemctl daemon-reload
systemctl enable vncserver@:1.service
systemctl start vncserver@:1.service
systemctl status vncserver@:1.service

That way, VNC server used to start a :1 display on startup.

After I upgrade to FC25, I tried the same steps, and have the observations as below:
VNC viewer is able to connect to VNC server running, but only a Black Screen is visible.

Later, on following suggestions from a similar post, I tried to change /root/.vnc/xstartup as :

Code:

#!/bin/sh

unset SESSION_MANAGER
unset DBUS_SESSION_BUS_ADDRESS
#exec /etc/X11/xinit/xinitrc
exec /usr/bin/gnome-session

I am still unable to get the Black screen issue fixed.
NOTE: Then, I issued command: "vncserver" manually, and a display :2 started -- I'm able to view the vnc session :2.

I need the :1 vnc display to start on startup.
Any leads are highly appreciated.

Thanks in advance,
Tanbir

jamison20000e · 09-29-2021, 07:01 PM

Hi.

Quote:

...Later, on following suggestions from a similar post, I tried to change /root/.vnc/xstartup as : ...

What posts did you find?

Maybe a simpler search: vnc screen blank

ptf · 10-03-2021, 12:37 PM

What is your complete /etc/systemd/system/vncserver@:1.service file?

tanbir91 · 05-18-2022, 05:51 AM

Posting the vncserver@:1.service file

Quote:

# The vncserver service unit file
#
# Quick HowTo:
# 1. Copy this file to /etc/systemd/system/vncserver@.service
# 2. Replace <USER> with the actual user name and edit vncserver
# parameters appropriately
# ("User=<USER>" and "/home/<USER>/.vnc/%H%i.pid")
# 3. Run `systemctl daemon-reload`
# 4. Run `systemctl enable vncserver@:<display>.service`
#
# DO NOT RUN THIS SERVICE if your local area network is
# untrusted! For a secure way of using VNC, you should
# limit connections to the local host and then tunnel from
# the machine you want to view VNC on (host A) to the machine
# whose VNC output you want to view (host B)
#
# [user@hostA ~]$ ssh -v -C -L 590N:localhost:590M hostB
#
# this will open a connection on port 590N of your hostA to hostB's port 590M
# (in fact, it ssh-connects to hostB and then connects to localhost (on hostB).
# See the ssh man page for details on port forwarding)
#
# You can then point a VNC client on hostA at vncdisplay N of localhost and with
# the help of ssh, you end up seeing what hostB makes available on port 590M
#
# Use "-nolisten tcp" to prevent X connections to your VNC server via TCP.
#
# Use "-localhost" to prevent remote VNC clients connecting except when
# doing so through a secure tunnel. See the "-via" option in the
# `man vncviewer' manual page.

[Unit]
Description=Remote desktop service (VNC)
After=syslog.target network.target

[Service]
Type=forking
User=svtuser

# Clean any existing files in /tmp/.X11-unix environment
#ExecStartPre=-/usr/bin/vncserver -kill %i
ExecStart=/usr/bin/vncserver %i
PIDFile=/root/.vnc/%H%i.pid
ExecStop=/usr/bin/vncserver -kill %i

[Install]
WantedBy=multi-user.target