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some days ago, after I do apt-get dist-upgrade and reboot, my monitor suddenly lose connection...I'm using Ubuntu 14.04. And here is some information about my monitor

$ lspci | grep -i vga
00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated Graphics Controller (rev 09)

.

$ xrandr
Screen 0: minimum 320 x 200, current 1366 x 768, maximum 32767 x 32767
eDP1 connected primary 1366x768+0+0 (normal left inverted right x axis y axis) 309mm x 173mm
   1366x768       60.1*+
   1360x768       59.8     60.0  
   1024x768       60.0  
   800x600        60.3     56.2  
   640x480        59.9  
HDMI1 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

And this is what I've done before it died. (after 12pm, I found the problem so I started to remove things) It's too long so I put it in gist. https://gist.github.com/linamy85/ccfbcbf0c1b765abb1cc

Appreciate any advice!!! I want my monitor back..

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    Open /var/log/apt/history.log and edit your question to add the entries about actions on the last day before your monitor stopped working. The latest actions are logged at the end of the file. Leave me a comment ('@ByteCommander') afterwards to notify me of the update.
    – Byte Commander
    Nov 30, 2015 at 14:22
  • Thanks, @ByteCommander but it's sad that it's too long ago that history.log don't even log it anymore...
    – Lin Amy
    Nov 30, 2015 at 14:38
  • Do you have files like /var/log/apt/history.log.*.gz? Those are compressed archives containing older history.log files. Open them with your favourite archive viewer and check the entries in there. If I remember right, those logs should get compressed and reset monthly.
    – Byte Commander
    Nov 30, 2015 at 14:59
  • @ByteCommander the log has been updated, thank you!
    – Lin Amy
    Dec 1, 2015 at 13:43

1 Answer 1

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After updating the linux kernel to 3.17+ and dual monitor works!

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