[Bug 216376] New: AMDGPU: display output disables and quickly reenables when switching AVR into/from standby doing HDMI passthrough

[bugzilla-daemon at kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=216376

            Bug ID: 216376
           Summary: AMDGPU: display output disables and quickly reenables
                    when switching AVR into/from standby doing HDMI
                    passthrough
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.19.1
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: low
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: jlp.bugs at gmail.com
        Regression: No

Created attachment 301600
  --> https://bugzilla.kernel.org/attachment.cgi?id=301600&action=edit
dmesg

I have A PC with Radeon RX480 which has HDMI output connected to HDMI input on
Marantz SR5015 AV reciever and there the HDMI output goes to a TV (Panasonic
TX-55CX200E). The DVI output is connected to an LCD monitor. The AVR has the
feature to pass through HDMI signal when put into standby mode. When I switch
AVR from/to standby mode it looks like it for a very short time interrupts the
connection from PC to TV and during this time it appears that the video card
output turns off and monitor layout is re-aranged to one screen (DVI) only and
then almost immediately back two previous dual screen layout. Would it be
possible to delay turning off the HDMI output for a bit longer so that it would
wait long enough that AVR would reconnect entire HDMI path to TV back again and
the HDMI output on video card would not need to be turned off and keep sending
output in the meantime? So that the display layout configuration would keep
being in dual-screen mode for the whole time?

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