Jtdcftul

I tried connecting my Ubuntu laptop to my TV via HDMI, apparently it`s not working. I already tried below options:

1.Run sudo apt-get purge nvidia-*



2.Run sudo add-apt-repository ppa:graphics-drivers/ppa



3.Run sudo apt-get update



4.Run sudo apt-get install nvidia-364 (Check what's the latest version... in my case as July 2017 nvidia-381 was avaliable)

But this does not work for me. My TV, Laptop and HDMI cable are fine, as I am easily able to use HDMI and connect to TV using WINDOWS OS

System Details Shows:

Processor: Intel® Core™ i5 CPU M 480 @ 2.67GHz × 4 

Graphics: Intel® Ironlake Mobile

I checked few more links and I found some commands, thought might be helpful, hence sharing the O/P

~$ lsmod | grep -i DRM

drm_kms_helper        151552  1 i915

syscopyarea            16384  1 drm_kms_helper

sysfillrect            16384  1 drm_kms_helper

sysimgblt              16384  1 drm_kms_helper

fb_sys_fops            16384  1 drm_kms_helper

drm                   352256  7 i915,drm_kms_helper



~$ lspci -k | grep -A 2 -i "VGA"

00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 18)

Subsystem: Dell Core Processor Integrated Graphics Controller

Kernel driver in use: i915

Let me know if any other details needed. Please help !!

Redirecting Audio can become quite difficult in some cases.

For example my firefox never liked to play audio thru hdmi while all other software did. Since i use pulse audio, it works like charm; check the end of this answer.

I am using Lubuntu 16.04. It might be different from your desktop, but automatic switching never occured by default. I always had to direct the audio stream manually. In general you have at least two audio-outputs: One analoge audiojack and one digital hdmi, in general on different audio-cards.

The hard way:

First i had to get an overview on the audiocards installed on my htpc (ati motherboard with onboard graphics and onboard cpu):

aplay -l



**** List of PLAYBACK Hardware Devices ****

card 0: Generic [HD-Audio Generic], device 3: HDMI 0 [HDMI 0]

  Subdevices: 1/1

  Subdevice #0: subdevice #0

card 1: SB [HDA ATI SB], device 0: ALC887-VD Analog [ALC887-VD Analog]

  Subdevices: 1/1

  Subdevice #0: subdevice #0

card 1: SB [HDA ATI SB], device 3: ALC887-VD Digital [ALC887-VD Digital]

  Subdevices: 1/1

  Subdevice #0: subdevice #0

and all the possible audio-streaming channels i could route the sound:

aplay -L



null

    Discard all samples (playback) or generate zero samples (capture)

pulse

    PulseAudio Sound Server

hdmi:CARD=Generic,DEV=0

    HD-Audio Generic, HDMI 0

    HDMI Audio Output

dmix:CARD=Generic,DEV=3

    HD-Audio Generic, HDMI 0

    Direct sample mixing device

dsnoop:CARD=Generic,DEV=3

    HD-Audio Generic, HDMI 0

    Direct sample snooping device

hw:CARD=Generic,DEV=3

    HD-Audio Generic, HDMI 0

    Direct hardware device without any conversions

plughw:CARD=Generic,DEV=3

    HD-Audio Generic, HDMI 0

    Hardware device with all software conversions

default:CARD=SB

    HDA ATI SB, ALC887-VD Analog

    Default Audio Device

sysdefault:CARD=SB

    HDA ATI SB, ALC887-VD Analog

    Default Audio Device

front:CARD=SB,DEV=0

    HDA ATI SB, ALC887-VD Analog

    Front speakers

surround21:CARD=SB,DEV=0

    HDA ATI SB, ALC887-VD Analog

    2.1 Surround output to Front and Subwoofer speakers

surround40:CARD=SB,DEV=0

    HDA ATI SB, ALC887-VD Analog

    4.0 Surround output to Front and Rear speakers

surround41:CARD=SB,DEV=0

    HDA ATI SB, ALC887-VD Analog

    4.1 Surround output to Front, Rear and Subwoofer speakers

surround50:CARD=SB,DEV=0

    HDA ATI SB, ALC887-VD Analog

    5.0 Surround output to Front, Center and Rear speakers

surround51:CARD=SB,DEV=0

    HDA ATI SB, ALC887-VD Analog

    5.1 Surround output to Front, Center, Rear and Subwoofer speakers

surround71:CARD=SB,DEV=0

    HDA ATI SB, ALC887-VD Analog

    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers

hdmi:CARD=SB,DEV=0

    HDA ATI SB, ALC887-VD Digital

    HDMI Audio Output

dmix:CARD=SB,DEV=0

    HDA ATI SB, ALC887-VD Analog

    Direct sample mixing device

dmix:CARD=SB,DEV=3

    HDA ATI SB, ALC887-VD Digital

    Direct sample mixing device

dsnoop:CARD=SB,DEV=0

    HDA ATI SB, ALC887-VD Analog

    Direct sample snooping device

dsnoop:CARD=SB,DEV=3

    HDA ATI SB, ALC887-VD Digital

    Direct sample snooping device

hw:CARD=SB,DEV=0

    HDA ATI SB, ALC887-VD Analog

    Direct hardware device without any conversions

hw:CARD=SB,DEV=3

    HDA ATI SB, ALC887-VD Digital

    Direct hardware device without any conversions

plughw:CARD=SB,DEV=0

    HDA ATI SB, ALC887-VD Analog

    Hardware device with all software conversions

plughw:CARD=SB,DEV=3

    HDA ATI SB, ALC887-VD Digital

    Hardware device with all software conversions

Now I needed to find out, which of these channels is used by my hdmi cable. Therefor I needed an audioplayer that allowed me to route the audio manually to test each of the above channels, one by one, until i found out, which of them belongs to my hdmi. With a GUI vlc and especially audacious come in handy. On CLI basis we could also use aplay, but i am not familiar with that.

Now, after having found out, which channel belongs to my hdmi cable, it was card 0, device 3, i needed to create a file in my homefolder .asoundrc Asound Wiki with the information what card, and what device to use.

pcm.snd_card {

        type hw

        card 0

        device 3

}



ctl.snd_card {

        type hw

        card 0

        device 3

}

Also i needed to run 'alsamixer'. With F6 i did select my soundcard and had to navigate with the arrow keys to the S/PDIF and activate (unmute) it with the M key.

After a reboot audio thru hdmi worked, but firefox remained unwilling to play audio via hdmi.

Long story short, now i use PulseAudio and i am very happy with it.

The easy way

Since i installed PulseAudio the handling of the audio devices has become very easy.
I would suggest you to install:
sudo apt-get install gstreamer1.0-pulseaudio pavucontrol pulseaudio-module-x11

pavucontrol is a comfortable GUI to (re)direct your audio-streams to the device/channel you want.

I hope this helps you to find a solution.

I was having this exact same problem a few days ago. Prior to this happening, I had installed KDE desktop and was just getting used to the new DE when all of a sudden the next day my HDMI stops working. Before switching to KDE, I had been using Budgie desktop and HDMI was working.

I tried everything but nothing worked. I spent almost an entire day trying to get this to work, but all to no avail.

Yesterday, finally got tired of KDE because of some issues (kWallet and kOrganizer were being difficult) that just affected the usability of the DE. After uninstalling the DE, I reboot my machine and like magic, my external monitor sprang to life.

I was shocked to say the least, but I hope that helps anyone.

tldr; If you have recently installed a new DE, try removing it!!

You must go to "system setting" choose display setting. There you will find all setting for HDMI.
At first you must at first connect your TV and your laptop with the HDMI cable. Only when you have make this connection the setting will appear.
Scuse me for my English because I'm French speaking.

What's worked for me is on the system settings, display, set your tv as primary monitor. And you've to do the same for the sound, click on the hdmi card and apply.