Comment # 1 on bug 1173748 from Peter S�tterlin

This morning I had another crash.  The computer had been running overnight,
both monitors were in DPMS suspend.  I moved the mouse, the laptop screen
switched on, but not the second monitor.  I moved the mouse cursor to the
second display and back (which sometimes activated it), but it stayed dark. 
Then I wanted to switch workspace using the mouse scroll wheel, but the machine
was dead.

Contrary to previous occurences, this time I had an error message in the log:

Aug 10 07:16:17 woodstock.pitnet kernel: i915 0000:00:02.0: [drm] *ERROR* CPU
pipe B FIFO underrun
Aug 10 07:16:17 woodstock.pitnet org_kde_powerdevil[2951]: powerdevil: set
screen brightness value:  852
Aug 10 07:16:17 woodstock.pitnet dbus-daemon[787]: [system] Activating service
name='org.kde.powerdevil.backlighthelper' requested by ':1.31' (uid=1000
pid=2951 comm="/usr/lib64/libexec/org_kde_powerdevil ") (using servicehelper)
Aug 10 07:16:17 woodstock.pitnet dbus-daemon[787]: [system] Successfully
activated service 'org.kde.powerdevil.backlighthelper'
Aug 10 07:16:17 woodstock.pitnet org_kde_powerdevil[2951]: powerdevil: Udev
device changed
"/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight"
"/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight"

Currently TW 20200804, kernel 5.7.11-1-default