[Bug 91751] New: Display still active even though primary plane is disabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91751

            Bug ID: 91751
           Summary: Display still active even though primary plane is
                    disabled
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: chris at chris-wilson.co.uk
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

CRTC info
---------
CRTC 21: pipe: A, active=yes (size=1600x1200)
    primary plane disabled
    encoder 31: type: TMDS-31, connectors:
        connector 32: type: HDMI-A-1, status: connected, mode:
        id 0:"1600x1200" freq 0 clock 0 hdisp 1600 hss 1664 hse 1856 htot 2160
vdisp 1200 vss 1201 vse 1204 vtot 1250 type 0x40 flags 0x0
    cursor visible? no, position (0, 0), size 0x0, addr 0x00000000, active? no
    underrun reporting: cpu=no pch=no 
CRTC 26: pipe: B, active=no (size=0x0)
    underrun reporting: cpu=no pch=no 

Connector info
--------------
connector 29: type VGA-1, status: disconnected
    modes:
connector 32: type HDMI-A-1, status: connected

and no mode set in x (i.e. HDMI1 connected but not enabled), I see lots of
corruption on the HDMI display. In places it looks like PTE values, but
inconsistent - possibly ringbuffers?

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