Hello, I don't know if my message can help somebody, but i have a similar problem with my laptop (MSI GT60 2PE dominator 3K). I don't have found a solution and I am not able to explain the real problem... However I have a workaround.
My laptop use a dual boot with Ubuntu 14.04 and Windows 8.1 and I have an optimus configuration for my video card (Intel/NVIDIA) First I will start by explain the procedure to reproduce the bug. At the begining, I am on linux with my NVIDIA card activated. If I connect an hdmi cable, there is no problem. I just need to select the hdmi audio device with Pulseaudio. However the video and the sound works fine with the hdmi output! Now I remove the hdmi cable and I shutdown my computer. I reboot now using Windows 8.1 (without HDMI cable!!) I reboot again on ubuntu. But now, if I connect again the HDMI cable, the video works but there is no sound. The audio device is not detected. I can switch on the intel card and come back on the NVIDIA but it the same. I can reinstall the nvidia driver, reinstall pulseaudio, reboot .... But nothing works!! The hdmi audio device has disapeared!!! The only one solution is to reboot on windows 8.1. I connect the hdmi cable, I check the sound works (on windows) and I shutdown the computer. Now if i reboot on linux the audio device is back!!! :) This is just a workaround, but it is not a solution... :( -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1377653 Title: HDMI sound output not detected / NVIDIA optimus laptop To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1377653/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
