Comment 45 for bug 1761751

Problem persists in kernel 4.16.11

#uname -r
4.16.11-041611-generic

#ls /sys/class/drm
card0 card0-eDP-1 card0-HDMI-A-1 renderD128 ttm version

#dmesg | grep drm
[ 1.783188] [drm] radeon kernel modesetting enabled.
[ 1.784832] fb: switching to radeondrmfb from EFI VGA
[ 1.831813] [drm] amdgpu kernel modesetting enabled.
[ 1.840215] [drm] initializing kernel modesetting (KAVERI 0x1002:0x130A 0x17AA:0x3988 0x00).
[ 1.840237] [drm] register mmio base: 0xF0B00000
[ 1.840239] [drm] register mmio size: 262144
[ 1.865264] [drm] BIOS signature incorrect 0 0
[ 1.865367] [drm] vm size is 64 GB, 2 levels, block size is 10-bit, fragment size is 9-bit
[ 1.865387] [drm] Detected VRAM RAM=1024M, BAR=1024M
[ 1.865390] [drm] RAM width 64bits UNKNOWN
[ 1.865779] [drm] amdgpu: 1024M of VRAM memory ready
[ 1.865783] [drm] amdgpu: 3072M of GTT memory ready.
[ 1.865807] [drm] GART: num cpu pages 262144, num gpu pages 262144
[ 1.865894] [drm] PCIE GART of 1024M enabled (table at 0x000000F400040000).
[ 1.866040] [drm] Internal thermal controller without fan control
[ 1.866046] [drm] amdgpu: dpm initialized
[ 1.867349] [drm] Found UVD firmware Version: 1.55 Family ID: 9
[ 1.867789] [drm] Found VCE firmware Version: 50.10 Binary ID: 2
[ 1.869984] [drm:construct [amdgpu]] *ERROR* construct: Invalid Connector ObjectID from Adapter Service for connector index:3! type 0 expected 3
[ 1.870074] [drm:construct [amdgpu]] *ERROR* construct: Invalid Connector ObjectID from Adapter Service for connector index:4! type 0 expected 3
[ 1.870200] [drm:construct [amdgpu]] *ERROR* construct: Invalid Connector ObjectID from Adapter Service for connector index:5! type 0 expected 3
[ 1.870309] [drm:construct [amdgpu]] *ERROR* construct: Invalid Connector ObjectID from Adapter Service for connector index:6! type 0 expected 3
[ 1.884255] [drm] Display Core initialized with v3.1.27!
[ 1.891240] [drm] SADs count is: -2, don't need to read it
[ 1.891668] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 1.891674] [drm] Driver supports precise vblank timestamp query.
[ 1.910078] [drm] UVD initialized successfully.
[ 2.026666] [drm] VCE initialized successfully.
[ 2.056074] [drm] fb mappable at 0xA042A000
[ 2.056083] [drm] vram apper at 0xA0000000
[ 2.056087] [drm] size 8294400
[ 2.056090] [drm] fb depth is 24
[ 2.056093] [drm] pitch is 7680
[ 2.056218] fbcon: amdgpudrmfb (fb0) is primary device
[ 2.113975] amdgpu 0000:00:01.0: fb0: amdgpudrmfb frame buffer device
[ 2.130285] [drm] Initialized amdgpu 3.23.0 20150101 for 0000:00:01.0 on minor 0