Created attachment 847720 [details]
Xorg.0.log & journalctl -b

Original Summary:
plasma session spontaneously aborts ~2 minutes after start, while doing nothing

IceWM stayed up >7 minutes before I assumed a Plasma-only problem and exited
it.

Switching to ati/radeon DDX from modesetting doesn't help.

# inxi -GSay
System:
  Host: hpg33 Kernel: 5.10.16-1-default x86_64 bits: 64 compiler: gcc 
  v: 10.2.1 
...
  Desktop: KDE Plasma 5.21.3 tk: Qt 5.15.2 wm: kwin_x11 vt: 7 dm: N/A 
  Distro: openSUSE Tumbleweed 20210321 
Graphics:
  Device-1: AMD RV610 [Radeon HD 2400 PRO] vendor: Dell driver: radeon 
  v: kernel bus-ID: 04:00.0 chip-ID: 1002:94c3 class-ID: 0300 
  Display: x11 server: X.Org 1.20.10 compositor: kwin_x11 driver: 
  loaded: modesetting unloaded: fbdev,vesa alternate: ati display-ID: :0 
  screens: 1 
  Screen-1: 0 s-res: 1920x1200 s-dpi: 120 s-size: 406x254mm (16.0x10.0") 
  s-diag: 479mm (18.9") 
  Monitor-1: DVI-I-1 res: 1920x1200 hz: 60 dpi: 94 
  size: 519x324mm (20.4x12.8") diag: 612mm (24.1") 
  OpenGL: renderer: AMD RV610 (DRM 2.50.0 / 5.10.16-1-default LLVM 11.0.1) 
  v: 3.3 Mesa 20.3.4 compat-v: 3.0 direct render: Yes 
# inxi -C
CPU:       Info: Dual Core model: Intel Core2 Duo E7500 bits: 64 type: MCP
cache: L2: 3 MiB 
           Speed: 1602 MHz min/max: 1600/2933 MHz Core speeds (MHz): 1: 1602 2:
1600 
# .xsession errors
/usr/etc/X11/xdm/Xsession: Checking whether an input method should be started.
sourcing /etc/sysconfig/language to get the value of INPUT_METHOD
INPUT_METHOD is not set or empty (no user selected input method).
Trying to start a default input method for the locale en_US.UTF-8 ...
There is no default input method for the current locale.
Dummy input method "none" (do not use any fancy input method by default)
gpg-connect-agent: no gpg-agent running in this session
gpg-connect-agent: no gpg-agent running in this session
xsettingsd: Loaded 0 settings from /root/.config/xsettingsd/xsettingsd.conf
xsettingsd: Created window 0x1600001 on screen 0 with timestamp 43291278
xsettingsd: Selection _XSETTINGS_S0 is owned by 0x0
xsettingsd: Took ownership of selection _XSETTINGS_S0
xsettingsd: Reloading configuration
xsettingsd: Loaded 0 settings from /root/.config/xsettingsd/xsettingsd.conf
xsettingsd: Reloading configuration
xsettingsd: Loaded 0 settings from /root/.config/xsettingsd/xsettingsd.conf
xsettingsd: Reloading configuration
xsettingsd: Loaded 0 settings from /root/.config/xsettingsd/xsettingsd.conf
xsettingsd: Reloading configuration
xsettingsd: Loaded 0 settings from /root/.config/xsettingsd/xsettingsd.conf
xsettingsd: Reloading configuration
xsettingsd: Loaded 10 settings from /root/.config/xsettingsd/xsettingsd.conf
xsettingsd: Reloading configuration
xsettingsd: Loaded 10 settings from /root/.config/xsettingsd/xsettingsd.conf
xsettingsd: Reloading configuration
xsettingsd: Loaded 10 settings from /root/.config/xsettingsd/xsettingsd.conf
xsettingsd: Reloading configuration
xsettingsd: Loaded 10 settings from /root/.config/xsettingsd/xsettingsd.conf
xsettingsd: Reloading configuration
xsettingsd: Loaded 10 settings from /root/.config/xsettingsd/xsettingsd.conf
[E][pipewire.c:335 add_interface()] can't get Spa:Pointer:Interface:Log
interface -2
[E][pipewire.c:368 load_journal_logger()] can't get log interface -2
[E][pipewire.c:335 add_interface()] can't get Spa:Pointer:Interface:CPU
interface -2
startkde: Starting up...
klauncher: Exiting on signal 1
X connection to :0 broken (explicit kill or server shutdown).
libGL error: failed to create drawable
libGL error: failed to create drawable
<new session>
/usr/etc/X11/xdm/Xsession: Checking whether an input method should be started.
sourcing /etc/sysconfig/language to get the value of INPUT_METHOD
INPUT_METHOD is not set or empty (no user selected input method).
Trying to start a default input method for the locale en_US.UTF-8 ...
There is no default input method for the current locale.
Dummy input method "none" (do not use any fancy input method by default)
gpg-connect-agent: no gpg-agent running in this session
gpg-connect-agent: no gpg-agent running in this session
xsettingsd: Loaded 0 settings from /root/.config/xsettingsd/xsettingsd.conf
xsettingsd: Created window 0x1600001 on screen 0 with timestamp 47100113
xsettingsd: Selection _XSETTINGS_S0 is owned by 0x0
xsettingsd: Took ownership of selection _XSETTINGS_S0
xsettingsd: Reloading configuration
xsettingsd: Loaded 0 settings from /root/.config/xsettingsd/xsettingsd.conf
xsettingsd: Reloading configuration
xsettingsd: Loaded 0 settings from /root/.config/xsettingsd/xsettingsd.conf
xsettingsd: Reloading configuration
xsettingsd: Loaded 10 settings from /root/.config/xsettingsd/xsettingsd.conf
xsettingsd: Reloading configuration
xsettingsd: Loaded 10 settings from /root/.config/xsettingsd/xsettingsd.conf
xsettingsd: Reloading configuration
xsettingsd: Loaded 10 settings from /root/.config/xsettingsd/xsettingsd.conf
xsettingsd: Reloading configuration
xsettingsd: Loaded 10 settings from /root/.config/xsettingsd/xsettingsd.conf
xsettingsd: Reloading configuration
xsettingsd: Loaded 10 settings from /root/.config/xsettingsd/xsettingsd.conf
xsettingsd: Reloading configuration
xsettingsd: Loaded 10 settings from /root/.config/xsettingsd/xsettingsd.conf
xsettingsd: Reloading configuration
xsettingsd: Loaded 10 settings from /root/.config/xsettingsd/xsettingsd.conf
[E][pipewire.c:335 add_interface()] can't get Spa:Pointer:Interface:Log
interface -2
[E][pipewire.c:368 load_journal_logger()] can't get log interface -2
[E][pipewire.c:335 add_interface()] can't get Spa:Pointer:Interface:CPU
interface -2
startkde: Starting up...
X connection to :0 broken (explicit kill or server shutdown).
klauncher: Exiting on signal 1