[RFC] Why Xorg waits for long time(200ms+) to invoke VT_RELDISP?

[Yu Chen]

Hi all,
Currently I'm evaluating the suspend/resume speed on my laptop,
and it was found the switching from Graphic Mode to text mode vt has taken more
than 200ms, and according to the ftrace result, after Xorg received
the signal from kernel, it waits for 200ms+ until finally issue the
ioctl VT_RELDISP, which makes the kernel blocking at this flag to be
set.
May I know why Xorg takes 200ms+ before acking with VT_RELDISP?
Thanks very much.

More info please refer to:
https://bugzilla.kernel.org/show_bug.cgi?id=186211

thanks,
Yu