[Bug 91277] New: 'Unknown' connector status when resuming from suspend

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91277

            Bug ID: 91277
           Summary: 'Unknown' connector status when resuming from suspend
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: tiagomatos at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Using kernel 4.1 on a thinkpad X240, I get the following after resuming from
suspend:

$ cat /sys/class/drm/card0/*/status
unknown
unknown
unknown
unknown
unknown

If at this point I just run the xrandr CLI tool, then I get correct values
again:

$ cat /sys/class/drm/card0/*/status
disconnected
disconnected
connected
disconnected
disconnected

I also found out that with kernel 4.0 I don't get the 'unknown' statuses on the
/sys connector files after resuming but nonetheless the X server doesn't seem
to get notified about newly connected ports (while suspended) until a forced
refresh with 'xrandr' is done.

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