After upgraded intel_gpu_tools to 19.1 I can't run intel_gpu_top from terminal
inside dektop session:

Test requirement not met in function drm_open_driver_master, file
drmtest.c:391:
Test requirement: drmSetMaster(fd) == 0
Can't become DRM master, please check if no other DRM client is running.
Last errno: 22, Invalid argument
SKIP (-1.000s)

It works when switching to different Virtual Console. It worked with 1.16
version I used before.

See also:
https://bbs.archlinux.org/viewtopic.php?pid=1732114