[Bug 89453] New: MST monitor doesn't come back from "xset dpms force off"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89453

            Bug ID: 89453
           Summary: MST monitor doesn't come back from "xset dpms force
                    off"
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: palmer at dabbelt.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 114057
  --> https://bugs.freedesktop.org/attachment.cgi?id=114057&action=edit
The log from running "git bisect" between 3.16 and 3.17

I have a DisplayPort MST monitor that I have attached to my Mac Book Pro 2014
via a mini DisplayPort to DisplayPort cable.  Since 3.16 my monitor doesn't
come back from sleep mode (this can be triggered by "xset dpms force off"). 
Specifically, I:

* xset dpms force off
* Wait for the monitor to say it's going to sleep and turn the backlight off
* Push a button on my keyboard
* The monitor wakes back up and turns the backlight on
* After a few seconds the monitor goes back into sleep mode, no image is ever
displayed.

During this time, my second monitor (a USB DisplayLink monitor) continues to
work fine.  Rebooting fixes the problem, but running "xrandr --output DP2
--off; xrandr --output DP2 --preferred" doesn't help, unplugging and
re-plugging the cable doesn't help, and killing X doesn't help.

I ran a "git bisect" which indicates that
0e32b39ceed665bfa4a77a4bc307b6652b991632 is the problem, but it's too big of a
commit for me to understand, sorry.  Attached is the "git bisect" log.  I'll be
attaching some other logs, but I'm afraid they're not very useful...

This in still broken on both 3.19 and 99aedde0869ce194539166ac5a4d2e1a20995348
(master from this morning).  4.0-rc2 has other problems, the display doesn't
come up at all.

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