[Bug 106193] When positioning a monitor output above or below initial configuration with xrandr, hard freeze with graphics artifacts 4.16.2+

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=106193

            Bug ID: 106193
           Summary: When positioning a monitor output above or below
                    initial configuration with xrandr, hard freeze with
                    graphics artifacts 4.16.2+
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: sass.joel@gmail.com

I'm unable to position my monitors outside of an inline configuration. I have 5
monitors, and if I try to position one outside of an inline configuration with
xrandr, it results in a hard lock.

Steps to replicate the process:

$ xrandr --fb 7680x2160

  xrandr --screen 0 output shows that the virtual desktop is set to 7680x2160

$ xrandr --output DP-6 --pos 0x1080

At that point, mouse and keyboard become unresponsive. After about 30 seconds,
monitor output shows artifacting. I'll see if I can post an image of what I
see.

It appears this also causes all network activity to stop. The system cannot be
pinged, and SSH server stops functioning. Seems to have the same issues as
https://bugs.freedesktop.org/show_bug.cgi?id=106159 which freezes the system
when connecting or disconnecting a displayport cable.

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