SUSE-12 SP4服务器连接VNC Server出现黑屏及总线连接拒绝问题

Looking at your error logs and configuration, the core issues are DBus bus connection failures and a misconfigured xstartup script that's causing gnome-session to crash. Let's walk through targeted fixes to resolve this:

1. Fix the .vnc/xstartup Configuration #

Your current script has conflicting logic with SESSION_MANAGER and DBUS_SESSION_BUS_ADDRESS (you unset then immediately export empty values, which breaks inter-process communication). Replace it with a simplified, working version based on your preferred desktop:

Option A: For IceWM (Lightweight, Reliable) #

#!/bin/sh
unset SESSION_MANAGER
unset DBUS_SESSION_BUS_ADDRESS
[ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources
xsetroot -solid grey
xterm -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" &
/usr/bin/icewm-session &

Option B: For GNOME (If You Need the Full Desktop) #

#!/bin/sh
export XDG_CURRENT_DESKTOP=GNOME
export GNOME_DESKTOP_SESSION_ID=this-is-deprecated
unset SESSION_MANAGER
unset DBUS_SESSION_BUS_ADDRESS
exec /usr/bin/gnome-session

After editing, make sure the script is executable:

chmod +x ~/.vnc/xstartup

2. Verify DBus Service is Running #

The "Connection refused" errors point to DBus not being available. Restart and check the service:

systemctl restart dbus
systemctl status dbus

Ensure it shows "active (running)" before proceeding.

3. Start VNC Server with Explicit Parameters #

Avoid ambiguous startup settings by specifying display, resolution, and depth explicitly:

vncserver :1 -geometry 1920x1080 -depth 24

If you want to replace an existing session, kill it first:

vncserver -kill :1

4. Avoid Running VNC as Root (If Possible) #

Root user environments often have stricter DBus permissions. Try creating a regular user account, installing VNC dependencies for that user, and starting the server from their session. This avoids many permission-related connection issues.

5. Address llvmpipe Rendering Issues #

Your log mentions llvmpipe detected (software rendering), which can cause GNOME to crash on resource-limited systems. If you stick with GNOME, ensure you have proper GPU drivers installed. Alternatively, switch to a lighter desktop like XFCE (install with zypper install xfce4 and update xstartup to launch startxfce4).

Verify the Fix #

After applying these changes, connect to your VNC session again. If it still fails, check the latest log at ~/.vnc/<hostname>:1.log for new errors and adjust accordingly.

内容的提问来源于stack exchange，提问作者saeeda