Same problem here (Ubuntu 20.04, i915 driver, Skylake Intel(R) Core(TM) 
i7-6500U CPU @ 2.50GHz
) :
- glxgears and vlc both give a black window
- /usr/bin/kcmshell5 kcm_networkmanagement    returns a segfault.

'export MESA_LOADER_DRIVER_OVERRIDE=i965' seems to solve all this. Many
thanks to Chenxi Wu  for this trick.

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https://bugs.launchpad.net/bugs/1876219

Title:
  iris driver for old cpu

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