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I've edited the original answer to make it more generic. It's now good for versions 12.04-15.04 at the time of this writing.


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It's not a very elegant solution, but I found if I run pavucontrol and go to the config tab, I see two entries with pulldown menus set to 'digital stereo (hdmi) output' and 'analog stereo output' respectively. If I set the top menu to 'off' the sound starts coming through my headphones. If I set it back to the original setting and set the second one to ...


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Try the speaker test first from root speaker-test -c 2 -r 48000 If you can hear the sounds via HDMI output then go to sound setting and make sure the HDMI is highlighted.


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Found the problem: Nvidia driver doesn't work with the two monitors.


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It was not an issue with a graphics card. I checked and it supports 3 monitors at the same time. And Ubuntu DOES support this (14.04). In my case, BenQ did not automatically recognize which cable was on so I had to manually set that input is coming from HDMI. I now have image on all 3 monitors and all is working flawlessly.


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The issue appears to be lack of MST support in the Linux kernel. Upgrading to Ubuntu 15.04 with kernel 3.19 fixed the issue for me, but only after I installed the proprietary nvidia drivers.


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It looks like you're trying to use three monitors on one card which, as far as I know, isn't possible. Like you're experiencing, the third monitor will be recognized, but trying to enable it either won't work, or it will disable the non-main (secondary) monitor. It's not a driver problem or a problem with Ubuntu, it's just not possible.


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In case somebody finds this via Google: The 6900 series does not allow for HDMI in a resolution above 1080p. It worked on my Windows machine because the drivers I used there were old and buggy. The drivers I used on Linux were not so it didn't allow me to go above 1080p (as it was supposed to).


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according to Alsa logs you the models is not the name of laptops. you should test for example model=asus-mode1 and I think snd-hda-intel is not correct snd_hda_intel is correct so use options snd_hda_intel model=asus-mode4


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The ASROCK IMB-150 has a lvds connector on the board, with no monitor connected it defaults to the LVDS, despite LVDS being disabled in BIOS. Disabling the LVDS and enabling the VGA port forced the output out the correct video port. adding consoleblank=0 solved a problem with the console not returning after the screen was blanked. /etc/default/grub ...


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Hate to report that we've solved the problem by removing the HDMI cable, fully shutting down the computers (we'd only been 'restarting' before) and replacing the HDMI cable once booted up and logged in. Now we can restart without removing the cable and it works fine.


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Open a terminal and type the following commands: sudo nano /etc/pulse/default.pa Press CTRL + w and type: load-module module-suspend-on-idle then press ENTER. Change the line to say this instead: # load-module module-suspend-on-idle This is called "commenting out" the line when you place a # at the beginning of the line the configuration listed on ...


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Looks like you need a custom modeline for your display (Basically a custom "output"). Either that or your drivers aren't working properly... I had this issue with an old monitor and a custom modeline sorted it right away :P You can add the native resolution modeline (1920x1080_60.00?) and then you should be able to switch to it, any other resolutions will ...


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On the volume icon on the desktop, there should be an icon of the external HDMI device. Press that and you should be able to disable that device for sound and it will automatically use the built in sound of your laptop.


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I guess VGA1 is your laptop screen. To use the HDMI output you usually have to press a function key on the laptop keyboard. It should have an icon of a monitor on it. Connect the HDMI to a monitor then use the function key to toggle between VGA, HDMI and BOTH.


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You have to add a new mode with a new resolution... You can do it and apply the new resolution using the command: xrandr --addmode <connection_type> 1200x1000_60.00 Where <connection_type> is usually VGA1, DP1 or HDMI1.



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