[Bug 97475] New: monitor off if not connected at boot

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97475

            Bug ID: 97475
           Summary: monitor off if not connected at boot
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: valerio.vanni at inwind.it
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 126024
  --> https://bugs.freedesktop.org/attachment.cgi?id=126024&action=edit
Xorg.0.log

Motherboard is an Asus H110M-K. OS is a Debian stretch amd64, with vanilla
kernel 4.7.2. It happened the same with Debian jessie and
xserver-xorg-video-intel backported.

The machine boots in text mode. This is expected, is how I want it to be. If I
want graphical mode, I log on and then "startx".

I have several machines connected through a KVM switch (PS2 Mouse + PS2
Keyboard+ VGA). This is one of them.

If the focus of KVM switch is on this machine, everything works fine.
After the boot sequence, I can move back and forth and I always find this
machine working.

But if the focus is on another machine *during the boot*, this machine stops
sending signal to monitor. If I then come back, I find the monitor is receiving
no signal. The machine is not stuck, it's working: if I press CTRL-ALT-CANC it
begins a normal shutdown, and if I try to logon by telnet or ssh there is no
issue.

Only the monitor is off.

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