Hi Raymond

here the details:

xrandr --verbose
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 32767 x 32767
eDP1 connected primary 1920x1080+0+0 (0x48) normal (normal left inverted right 
x axis y axis) 345mm x 194mm
        Identifier: 0x43
        Timestamp:  23518
        Subpixel:   unknown
        Gamma:      1.0:1.0:1.0
        Brightness: 1.0
        Clones:    
        CRTC:       0
        CRTCs:      0 1 2
        Transform:  1.000000 0.000000 0.000000
                    0.000000 1.000000 0.000000
                    0.000000 0.000000 1.000000
                   filter: 
        EDID: 
                00ffffffffffff0030e4230300000000
                00160104952313780a25b5a159599d27
                1c505400000001010101010101010101
                010101010101e83580a8703816402024
                550059c2100000180000000000000000
                00000000000000000000000000fe004c
                4720446973706c61790a2020000000fe
                004c503135365746342d535042310069
        BACKLIGHT: 16 
                range: (0, 100)
        Backlight: 16 
                range: (0, 100)
        scaling mode: Full aspect 
                supported: None, Full, Center, Full aspect
        Broadcast RGB: Automatic 
                supported: Automatic, Full, Limited 16:235
        audio: auto 
                supported: force-dvi, off, auto, on
  1920x1080 (0x48)  138.0MHz -HSync -VSync *current +preferred
        h: width  1920 start 1952 end 1988 total 2088 skew    0 clock   66.1KHz
        v: height 1080 start 1085 end 1090 total 1102           clock   60.0Hz
  1920x1080 (0xab)  138.5MHz +HSync -VSync
        h: width  1920 start 1968 end 2000 total 2080 skew    0 clock   66.6KHz
        v: height 1080 start 1083 end 1088 total 1111           clock   59.9Hz
  1680x1050 (0xac)  146.2MHz -HSync +VSync
        h: width  1680 start 1784 end 1960 total 2240 skew    0 clock   65.3KHz
        v: height 1050 start 1053 end 1059 total 1089           clock   60.0Hz
  1680x1050 (0xad)  119.0MHz +HSync -VSync
        h: width  1680 start 1728 end 1760 total 1840 skew    0 clock   64.7KHz
        v: height 1050 start 1053 end 1059 total 1080           clock   59.9Hz
  1600x1024 (0xae)  103.1MHz +HSync +VSync
        h: width  1600 start 1600 end 1656 total 1664 skew    0 clock   62.0KHz
        v: height 1024 start 1024 end 1029 total 1030           clock   60.2Hz
  1400x1050 (0xaf)  122.0MHz +HSync +VSync
        h: width  1400 start 1488 end 1640 total 1880 skew    0 clock   64.9KHz
        v: height 1050 start 1052 end 1064 total 1082           clock   60.0Hz
  1280x1024 (0xb0)  108.0MHz +HSync +VSync
        h: width  1280 start 1328 end 1440 total 1688 skew    0 clock   64.0KHz
        v: height 1024 start 1025 end 1028 total 1066           clock   60.0Hz
  1440x900 (0xb1)  106.5MHz -HSync +VSync
        h: width  1440 start 1520 end 1672 total 1904 skew    0 clock   55.9KHz
        v: height  900 start  903 end  909 total  934           clock   59.9Hz
  1280x960 (0xb2)  108.0MHz +HSync +VSync
        h: width  1280 start 1376 end 1488 total 1800 skew    0 clock   60.0KHz
        v: height  960 start  961 end  964 total 1000           clock   60.0Hz
  1360x768 (0xb3)   84.8MHz -HSync +VSync
        h: width  1360 start 1432 end 1568 total 1776 skew    0 clock   47.7KHz
        v: height  768 start  771 end  781 total  798           clock   59.8Hz
  1360x768 (0xb4)   72.0MHz +HSync -VSync
        h: width  1360 start 1408 end 1440 total 1520 skew    0 clock   47.4KHz
        v: height  768 start  771 end  781 total  790           clock   60.0Hz
  1152x864 (0xb5)   81.6MHz -HSync +VSync
        h: width  1152 start 1216 end 1336 total 1520 skew    0 clock   53.7KHz
        v: height  864 start  865 end  868 total  895           clock   60.0Hz
  1024x768 (0xb6)   65.0MHz -HSync -VSync
        h: width  1024 start 1048 end 1184 total 1344 skew    0 clock   48.4KHz
        v: height  768 start  771 end  777 total  806           clock   60.0Hz
  800x600 (0xb7)   40.0MHz +HSync +VSync
        h: width   800 start  840 end  968 total 1056 skew    0 clock   37.9KHz
        v: height  600 start  601 end  605 total  628           clock   60.3Hz
  800x600 (0xb8)   36.0MHz +HSync +VSync
        h: width   800 start  824 end  896 total 1024 skew    0 clock   35.2KHz
        v: height  600 start  601 end  603 total  625           clock   56.2Hz
  640x480 (0xb9)   25.2MHz -HSync -VSync
        h: width   640 start  656 end  752 total  800 skew    0 clock   31.5KHz
        v: height  480 start  490 end  492 total  525           clock   59.9Hz
VGA1 disconnected (normal left inverted right x axis y axis)
        Identifier: 0x44
        Timestamp:  23518
        Subpixel:   unknown
        Clones:    
        CRTCs:      0 1 2
        Transform:  1.000000 0.000000 0.000000
                    0.000000 1.000000 0.000000
                    0.000000 0.000000 1.000000
                   filter: 
HDMI1 disconnected (normal left inverted right x axis y axis)
        Identifier: 0x45
        Timestamp:  23518
        Subpixel:   unknown
        Clones:    
        CRTCs:      0 1 2
        Transform:  1.000000 0.000000 0.000000
                    0.000000 1.000000 0.000000
                    0.000000 0.000000 1.000000
                   filter: 
        Broadcast RGB: Automatic 
                supported: Automatic, Full, Limited 16:235
        audio: auto 
                supported: force-dvi, off, auto, on
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
        Identifier: 0x46
        Timestamp:  23518
        Subpixel:   no subpixels
        Clones:    
        CRTCs:      3
        Transform:  1.000000 0.000000 0.000000
                    0.000000 1.000000 0.000000
                    0.000000 0.000000 1.000000
                   filter: 


alsa-info  http://www.alsa-
project.org/db/?f=629c47bef132d5885f48680557221637d0aeb9b1

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https://bugs.launchpad.net/bugs/1256655

Title:
  [Gazelle Professional, Intel Haswell HDMI, Digital Out, HDMI] Playback
  problem, built in speakers work but no audio over HDMI

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