I'm running openSUSE Tumbleweed with an Intel UHD Graphics 630 (Desktop) and
the modprobe i915 driver.  I use Plasma as my desktop environment, and this had
been working without significant problems since I first set up the machine
around April 2019.  But for the last month or two, I've been experiencing a
problem whereby my entire desktop (both screens on a dual-monitor setup) go
completely black.  I can't reliably reproduce the problem, though it happens
several times a day, usually (but not always) when I'm using the mouse to
drag-select.  Sometimes the display stays blank for only a second, but
sometimes it freezes that way until I press a key on the keyboard.

On the assumption that this is a graphics driver issue, here's the output of
hwinfo --gfxcard:

20: PCI 02.0: 0300 VGA compatible controller (VGA)              
  [Created at pci.386]
  Unique ID: _Znp.gLFUXSVXjU5
  SysFS ID: /devices/pci0000:00/0000:00:02.0
  SysFS BusID: 0000:00:02.0
  Hardware Class: graphics card
  Device Name: "Onboard - Video"
  Model: "Intel UHD Graphics 630 (Desktop)"
  Vendor: pci 0x8086 "Intel Corporation"
  Device: pci 0x3e92 "UHD Graphics 630 (Desktop)"
  SubVendor: pci 0x1043 "ASUSTeK Computer Inc."
  SubDevice: pci 0x8694 
  Driver: "i915"
  Driver Modules: "i915"
  Memory Range: 0xa0000000-0xa0ffffff (rw,non-prefetchable)
  Memory Range: 0x90000000-0x9fffffff (ro,non-prefetchable)
  I/O Ports: 0x4000-0x403f (rw)
  Memory Range: 0x000c0000-0x000dffff (rw,non-prefetchable,disabled)
  IRQ: 125 (372520 events)
  Module Alias: "pci:v00008086d00003E92sv00001043sd00008694bc03sc00i00"
  Driver Info #0:
    Driver Status: i915 is active
    Driver Activation Cmd: "modprobe i915"
  Config Status: cfg=new, avail=yes, need=no, active=unknown

Primary display adapter: #20