Actually, while I think of it, could you connect an hdmi cable directly between the computer and TV (hdmi-1), then post the output of
xrandr --verbose
		
		
	 
Computer now connects directly to HDMI 1
Very interesting!
daniel@daniel-System-Product-Name:~$ xrandr --verbose
Screen 0: minimum 8 x 8, current 4096 x 2160, maximum 16384 x 16384
DVI-I-0 disconnected (normal left inverted right x axis y axis)
   Identifier: 0x27e
   Timestamp:  1819771
   Subpixel:  unknown
   Clones:  
   CRTCs:  0 1 2 3
   Transform:  1.000000 0.000000 0.000000
    0.000000 1.000000 0.000000
    0.000000 0.000000 1.000000
    filter:
   CscMatrix: 65536 0 0 0 0 65536 0 0 0 0 65536 0
   BorderDimensions: 4
     supported: 4
   Border: 0 0 0 0
     range: (0, 65535)
   SignalFormat: VGA
     supported: VGA
   ConnectorType: DVI-I
   ConnectorNumber: 0
   _ConnectorLocation: 0
DVI-I-1 disconnected (normal left inverted right x axis y axis)
   Identifier: 0x27f
   Timestamp:  1819771
   Subpixel:  unknown
   Clones:  
   CRTCs:  0 1 2 3
   Transform:  1.000000 0.000000 0.000000
    0.000000 1.000000 0.000000
    0.000000 0.000000 1.000000
    filter:
   CscMatrix: 65536 0 0 0 0 65536 0 0 0 0 65536 0
   BorderDimensions: 4
     supported: 4
   Border: 0 0 0 0
     range: (0, 65535)
   SignalFormat: TMDS
     supported: TMDS
   ConnectorType: DVI-I
   ConnectorNumber: 0
   _ConnectorLocation: 0
HDMI-0 connected primary 4096x2160+0+0 (0x2c9) normal (normal left inverted right x axis y axis) 256mm x 135mm
   Identifier: 0x280
   Timestamp:  1819771
   Subpixel:  unknown
   Gamma:  1.0:1.0:1.0
   Brightness: 1.0
   Clones:  
   CRTC:  0
   CRTCs:  0 1 2 3
   Transform:  1.000000 0.000000 0.000000
    0.000000 1.000000 0.000000
    0.000000 0.000000 1.000000
    filter:
   CscMatrix: 65536 0 0 0 0 65536 0 0 0 0 65536 0
   EDID:
     00ffffffffffff0011ee430001010101
     00180103807341780acf74a3574cb023
     09484c21080081c08140818001010101
     01010101010108e80030f2705a80b058
     8a00ba882100001e023a801871382d40
     582c4500501d7400001e000000fc0044
     454e4f4e2d4156414d500a20000000fd
     00184b0f883c000a2020202020200164
     0203657162615e5f605d6a6b01020405
     101113141f202122120365666263640e
     230f241d251e26320f7f073d1ec01507
     505f7e01570600677e00835f00006e03
     0c001500383c2000800102030467d85d
     c401788803e200f9e305ff01e3060d01
     e40f690060011d8018711c1620582c25
     00c48e2100009e00000000000000003d
   BorderDimensions: 4
     supported: 4
   Border: 0 0 0 0
     range: (0, 65535)
   SignalFormat: TMDS
     supported: TMDS
   ConnectorType: HDMI
   ConnectorNumber: 2
   _ConnectorLocation: 2
  3840x2160 (0x2c6) 594.000MHz +HSync +VSync +preferred
  h: width  3840 start 4016 end 4104 total 4400 skew  0 clock 135.00KHz
  v: height 2160 start 2168 end 2178 total 2250  clock  60.00Hz
  4096x2160 (0x2c7) 593.410MHz +HSync +VSync
  h: width  4096 start 4184 end 4272 total 4400 skew  0 clock 134.87KHz
  v: height 2160 start 2168 end 2178 total 2250  clock  59.94Hz
  4096x2160 (0x2c8) 594.000MHz +HSync +VSync
  h: width  4096 start 5064 end 5152 total 5280 skew  0 clock 112.50KHz
  v: height 2160 start 2168 end 2178 total 2250  clock  50.00Hz
  4096x2160 (0x2c9) 296.700MHz +HSync +VSync *current
  h: width  4096 start 4184 end 4272 total 4400 skew  0 clock  67.43KHz
  v: height 2160 start 2168 end 2178 total 2250  clock  29.97Hz
  4096x2160 (0x2ca) 297.000MHz +HSync +VSync
  h: width  4096 start 5064 end 5152 total 5280 skew  0 clock  56.25KHz
  v: height 2160 start 2168 end 2178 total 2250  clock  25.00Hz
  4096x2160 (0x2cb) 297.000MHz +HSync +VSync
  h: width  4096 start 5116 end 5204 total 5500 skew  0 clock  54.00KHz
  v: height 2160 start 2168 end 2178 total 2250  clock  24.00Hz
  4096x2160 (0x2cc) 296.750MHz +HSync +VSync
  h: width  4096 start 5116 end 5204 total 5500 skew  0 clock  53.95KHz
  v: height 2160 start 2168 end 2178 total 2250  clock  23.98Hz
  3840x2160 (0x2cd) 593.410MHz +HSync +VSync
  h: width  3840 start 4016 end 4104 total 4400 skew  0 clock 134.87KHz
  v: height 2160 start 2168 end 2178 total 2250  clock  59.94Hz
  3840x2160 (0x2ce) 594.000MHz +HSync +VSync
  h: width  3840 start 4896 end 4984 total 5280 skew  0 clock 112.50KHz
  v: height 2160 start 2168 end 2178 total 2250  clock  50.00Hz
  3840x2160 (0x2cf) 296.700MHz +HSync +VSync
  h: width  3840 start 4016 end 4104 total 4400 skew  0 clock  67.43KHz
  v: height 2160 start 2168 end 2178 total 2250  clock  29.97Hz
  3840x2160 (0x2d0) 297.000MHz +HSync +VSync
  h: width  3840 start 4896 end 4984 total 5280 skew  0 clock  56.25KHz
  v: height 2160 start 2168 end 2178 total 2250  clock  25.00Hz
  3840x2160 (0x2d1) 296.750MHz +HSync +VSync
  h: width  3840 start 5116 end 5204 total 5500 skew  0 clock  53.95KHz
  v: height 2160 start 2168 end 2178 total 2250  clock  23.98Hz
  1920x1080 (0x281) 148.500MHz +HSync +VSync
  h: width  1920 start 2008 end 2052 total 2200 skew  0 clock  67.50KHz
  v: height 1080 start 1084 end 1089 total 1125  clock  60.00Hz
  1920x1080 (0x2d2) 148.350MHz +HSync +VSync
  h: width  1920 start 2008 end 2052 total 2200 skew  0 clock  67.43KHz
  v: height 1080 start 1084 end 1089 total 1125  clock  59.94Hz
  1920x1080 (0x2d3) 148.500MHz +HSync +VSync
  h: width  1920 start 2448 end 2492 total 2640 skew  0 clock  56.25KHz
  v: height 1080 start 1084 end 1089 total 1125  clock  50.00Hz
  1920x1080 (0x2d4) 74.180MHz +HSync +VSync
  h: width  1920 start 2008 end 2052 total 2200 skew  0 clock  33.72KHz
  v: height 1080 start 1084 end 1089 total 1125  clock  29.97Hz
  1920x1080 (0x2d5) 74.250MHz +HSync +VSync
  h: width  1920 start 2448 end 2492 total 2640 skew  0 clock  28.12KHz
  v: height 1080 start 1084 end 1089 total 1125  clock  25.00Hz
  1920x1080 (0x2d6) 74.180MHz +HSync +VSync
  h: width  1920 start 2558 end 2602 total 2750 skew  0 clock  26.97KHz
  v: height 1080 start 1084 end 1089 total 1125  clock  23.98Hz
  1920x1080 (0x282) 74.250MHz +HSync +VSync Interlace
  h: width  1920 start 2008 end 2052 total 2200 skew  0 clock  33.75KHz
  v: height 1080 start 1084 end 1094 total 1124  clock  60.05Hz
  1920x1080 (0x2d7) 74.180MHz +HSync +VSync Interlace
  h: width  1920 start 2008 end 2052 total 2200 skew  0 clock  33.72KHz
  v: height 1080 start 1084 end 1094 total 1124  clock  60.00Hz
  1920x1080 (0x2d8) 74.250MHz +HSync +VSync Interlace
  h: width  1920 start 2448 end 2492 total 2640 skew  0 clock  28.12KHz
  v: height 1080 start 1084 end 1094 total 1124  clock  50.04Hz
  1280x1024 (0x283) 108.000MHz +HSync +VSync
  h: width  1280 start 1328 end 1440 total 1688 skew  0 clock  63.98KHz
  v: height 1024 start 1025 end 1028 total 1066  clock  60.02Hz
  1280x960 (0x284) 108.000MHz +HSync +VSync
  h: width  1280 start 1376 end 1488 total 1800 skew  0 clock  60.00KHz
  v: height  960 start  961 end  964 total 1000  clock  60.00Hz
  1280x720 (0x285) 74.250MHz +HSync +VSync
  h: width  1280 start 1390 end 1430 total 1650 skew  0 clock  45.00KHz
  v: height  720 start  725 end  730 total  750  clock  60.00Hz
  1280x720 (0x2d9) 74.180MHz +HSync +VSync
  h: width  1280 start 1390 end 1430 total 1650 skew  0 clock  44.96KHz
  v: height  720 start  725 end  730 total  750  clock  59.94Hz
  1280x720 (0x2da) 74.250MHz +HSync +VSync
  h: width  1280 start 1720 end 1760 total 1980 skew  0 clock  37.50KHz
  v: height  720 start  725 end  730 total  750  clock  50.00Hz
  1024x768 (0x286) 65.000MHz -HSync -VSync
  h: width  1024 start 1048 end 1184 total 1344 skew  0 clock  48.36KHz
  v: height  768 start  771 end  777 total  806  clock  60.00Hz
  800x600 (0x287) 40.000MHz +HSync +VSync
  h: width  800 start  840 end  968 total 1056 skew  0 clock  37.88KHz
  v: height  600 start  601 end  605 total  628  clock  60.32Hz
  720x576 (0x2db) 27.000MHz -HSync -VSync
  h: width  720 start  732 end  796 total  864 skew  0 clock  31.25KHz
  v: height  576 start  581 end  586 total  625  clock  50.00Hz
  720x480 (0x2dc) 27.000MHz -HSync -VSync
  h: width  720 start  736 end  798 total  858 skew  0 clock  31.47KHz
  v: height  480 start  489 end  495 total  525  clock  59.94Hz
  640x480 (0x288) 25.175MHz -HSync -VSync
  h: width  640 start  656 end  752 total  800 skew  0 clock  31.47KHz
  v: height  480 start  490 end  492 total  525  clock  59.94Hz
  640x480 (0x2dd) 25.170MHz -HSync -VSync
  h: width  640 start  656 end  752 total  800 skew  0 clock  31.46KHz
  v: height  480 start  490 end  492 total  525  clock  59.93Hz
DP-0 disconnected (normal left inverted right x axis y axis)
   Identifier: 0x289
   Timestamp:  1819771
   Subpixel:  unknown
   Clones:  
   CRTCs:  0 1 2 3
   Transform:  1.000000 0.000000 0.000000
    0.000000 1.000000 0.000000
    0.000000 0.000000 1.000000
    filter:
   CscMatrix: 65536 0 0 0 0 65536 0 0 0 0 65536 0
   BorderDimensions: 4
     supported: 4
   Border: 0 0 0 0
     range: (0, 65535)
   SignalFormat: TMDS
     supported: TMDS
   ConnectorType: DisplayPort
   ConnectorNumber: 3
   _ConnectorLocation: 3
DVI-D-0 disconnected (normal left inverted right x axis y axis)
   Identifier: 0x28a
   Timestamp:  1819771
   Subpixel:  unknown
   Clones:  
   CRTCs:  0 1 2 3
   Transform:  1.000000 0.000000 0.000000
    0.000000 1.000000 0.000000
    0.000000 0.000000 1.000000
    filter:
   CscMatrix: 65536 0 0 0 0 65536 0 0 0 0 65536 0
   BorderDimensions: 4
     supported: 4
   Border: 0 0 0 0
     range: (0, 65535)
   SignalFormat: TMDS
     supported: TMDS
   ConnectorType: DVI-D
   ConnectorNumber: 1
   _ConnectorLocation: 1
DP-1 disconnected (normal left inverted right x axis y axis)
   Identifier: 0x28b
   Timestamp:  1819771
   Subpixel:  unknown
   Clones:  
   CRTCs:  0 1 2 3
   Transform:  1.000000 0.000000 0.000000
    0.000000 1.000000 0.000000
    0.000000 0.000000 1.000000
    filter:
   CscMatrix: 65536 0 0 0 0 65536 0 0 0 0 65536 0
   BorderDimensions: 4
     supported: 4
   Border: 0 0 0 0
     range: (0, 65535)
   SignalFormat: DisplayPort
     supported: DisplayPort
   ConnectorType: DisplayPort
   ConnectorNumber: 3
   _ConnectorLocation: 3
daniel@daniel-System-Product-Name:~$