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I'm running Ubuntu 13.04 on an Asus laptop. My graphics driver is Mobile Intel GM45 Express Chipset x86/MMX/SSE2. I was watching TV through my HDMI cable last night, and I've used this same setup with numerous old distributions. I upgraded to Ubuntu 13.04 a few days ago, and the HDMI output has been working better than before. This morning it stopped. I tried replacing the HDMI cable and trying different inputs on my TV. The TV just displays a floating No Signal box, but Ubuntu sees the TV in the Displays settings, and if I turn the TV off, my laptop screen flashes black and the TV display options disappear.

I have no clue what happened or what to do next.

Here's the output from xrandr --verbose for HDMI1 when the TV is hooked up:

HDMI1 connected (normal left inverted right x axis y axis)
    Identifier: 0x43
    Timestamp:  2051272
    Subpixel:   unknown
    Gamma:      1.0:1.0:1.0
    Brightness: 1.0
    Clones:    
    CRTC:       1
    CRTCs:      0 1
    Transform:  1.000000 0.000000 0.000000
                0.000000 1.000000 0.000000
                0.000000 0.000000 1.000000
               filter: 
    EDID:
        00ffffffffffff006a4e020302000000
        2511010380321e000a9203a256489925
        144a4d21080001010101010101010101
        010101010101662150b051001b304070
        3600c58f2100001e8c0ad08a20e02d10
        103e9600f41911000018000000fc005a
        4f52414e204d41545249580a000000fd
        003b3d0f2e0f000a20202020202001c8
        02031a71470584030201070626090707
        15075066030c00100080011d007251d0
        1e206e285500f4191100001e8c0ad08a
        20e02d10103e9600902d11000018011d
        8018711c1620582c2500f4191100009e
        8c0aa01451f01600267c4300f4191100
        00988c0aa01451f01600267c4300902d
        110000980000000000000000000000cc
    Broadcast RGB:  Full
        supported: Full         Limited 16:2
    audio:  auto
        supported: force-dvi    off          auto         on          
  1360x768 (0xc7)   85.5MHz +HSync +VSync +preferred
        h: width  1360 start 1424 end 1536 total 1792 skew    0 clock   47.7KHz
        v: height  768 start  771 end  777 total  795           clock   60.0Hz
  1920x1080i (0xc8)   74.2MHz +HSync +VSync Interlace
        h: width  1920 start 2008 end 2052 total 2200 skew    0 clock   33.8KHz
        v: height 1080 start 1084 end 1094 total 1125           clock   30.0Hz
  1280x720 (0xc9)   74.2MHz +HSync +VSync
        h: width  1280 start 1390 end 1430 total 1650 skew    0 clock   45.0KHz
        v: height  720 start  725 end  730 total  750           clock   60.0Hz
  1024x768 (0x4a)   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
  1440x480i (0xca)   27.0MHz -HSync -VSync Interlace
        h: width  1440 start 1478 end 1602 total 1716 skew    0 clock   15.7KHz
        v: height  480 start  488 end  494 total  525           clock   30.0Hz
  1440x480i (0xcb)   27.0MHz -HSync -VSync Interlace
        h: width  1440 start 1478 end 1602 total 1716 skew    0 clock   15.7KHz
        v: height  480 start  488 end  494 total  525           clock   30.0Hz
  800x600 (0x4b)   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
  720x480 (0xcc)   27.0MHz -HSync -VSync
        h: width   720 start  736 end  798 total  858 skew    0 clock   31.5KHz
        v: height  480 start  489 end  495 total  525           clock   59.9Hz
  640x480 (0xcd)   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   60.0Hz
  640x480 (0x4d)   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   59.9H
share|improve this question
    
What do you mean by "working better than before"? Does the TV work with any other HDMI device? Can you test the TV with another input and any other HDMI output device with your laptop? –  int_ua Oct 27 '13 at 2:06
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