[Bug 99173] Xorg waits for long time(200ms+) to invoke VT_RELDISP

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99173

--- Comment #10 from zhang rui <rui.zhang at intel.com> ---
Created attachment 131408
  --> https://bugs.freedesktop.org/attachment.cgi?id=131408&action=edit
pm_console_suspend delay during suspend

Don't know what kind of info is needed.
This problem can be reproduced on many platforms. here is the analyze_suspend
output on Dell XPS 13 9360, which is a KBL platform, with 4.11 kernel.

As you can see in the ftrace output
          python-2517  [003] d...   267.793000: pm_prepare_console_cal:
(pm_prepare_console+0x0/0x40)
          python-2517  [000] d...   268.065713: pm_prepare_console_ret:
(pm_suspend+0x1dd/0x3a0 <- pm_prepare_console) arg1=0x0

this is the time cost by switching console during suspend.

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