f0d75d8d3d
After logind receives the SIGRTMIN signal from the kernel, it will execute manager_vt_switch---session_leave_vt---session_device_pause_all,The device permissions of the session are removed here;under normal circumstances, the tty value read from /sys/class/tty/tty0/active changes and switchesto a new session,give the new session resume device permissions. But under abnormal circumstances (such as switching quickly on a device using wayland; and sometimes the kernel will suddenly send a SIGRTMIN signal, but nothing changes),In these cases, logind does not give session resume device permission, causing the device to have a black screen and suspended animation. (cherry picked from commit 2f1d1140101268e69204ec62dd9abb8ead4b48c8) (cherry picked from commit ca4f72f46009ce249d6c265b2a0fba67e7b72ad8)
System and Service Manager
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