[SOLVED] No sound on TV via hdmi

[paut]

My Zotac Zbox CI343 doesn't give any sound when connected to my (not smart) Samsung TV through a hdmi cable (the TV set connects to an amplifier). What can be the cause? How can I test what' s wrong? Some system info:

Code: Select all

System:
  Kernel: 5.15.0-100-generic x86_64 bits: 64 compiler: gcc v: 11.4.0 Desktop: Xfce 4.18.1
    tk: Gtk 3.24.33 info: xfce4-panel wm: xfwm 4.18.0 vt: 7 dm: LightDM 1.30.0
    Distro: Linux Mint 21.3 Virginia base: Ubuntu 22.04 jammy
Machine:
  Type: Desktop System: ZOTAC product: ZBOX- v: XX serial: <superuser required>
  Mobo: ZOTAC model: ZBOX- serial: <superuser required> UEFI: American Megatrends LLC. v: 5.27
    date: 04/19/2023
Audio:
  Device-1: Intel vendor: ZOTAC driver: snd_hda_intel v: kernel bus-ID: 00:1f.3 chip-ID: 8086:54c8
    class-ID: 0403
  Device-2: Zoran Personal Media Division (Nogatech) USB Audio and HID type: USB
    driver: snd-usb-audio bus-ID: 3-4:3 chip-ID: 0573:1573 class-ID: 0300 serial: <filter>
  Sound Server-1: ALSA v: k5.15.0-100-generic running: yes
  Sound Server-2: PulseAudio v: 15.99.1 running: yes
  Sound Server-3: PipeWire v: 0.3.48 running: yes
Repos:
  Packages: apt: 2226
  No active apt repos in: /etc/apt/sources.list
  Active apt repos in: /etc/apt/sources.list.d/official-package-repositories.list
    1: deb http: //packages.linuxmint.com virginia main upstream import backport
    2: deb http: //archive.ubuntu.com/ubuntu jammy main restricted universe multiverse
    3: deb http: //archive.ubuntu.com/ubuntu jammy-updates main restricted universe multiverse
    4: deb http: //archive.ubuntu.com/ubuntu jammy-backports main restricted universe multiverse
    5: deb http: //security.ubuntu.com/ubuntu/ jammy-security main restricted universe multiverse
Info:
  Processes: 210 Uptime: 2m wakeups: 2 Memory: 15.36 GiB used: 1.17 GiB (7.6%) Init: systemd
  v: 249 runlevel: 5 Compilers: gcc: 11.4.0 alt: 11/12 Client: Unknown python3.10 client
  inxi: 3.3.13

[paut]

Addition: when I connect the Zbox with the amplifier through a 3,5 mm headphone cable, there' s sound via the amplifier. The same when I plug in a headset with a 3,5 mm plug directly in the Zbox.

[diabolicbg]

First, I would suggest opening Sound Settings -> Hardware. You probably also have a second device that is turned off. Plug the hdmi cable into the TV and set the turned off device to On to see if any sound will appear.

2. Your hardware is very new and needs a newer kernel. If my first tip doesn't help, try installing kernel 6.2, and if necessary 6.5 from Update Manager -> View -> Linux Kernels.

[paut]

Hi @diabolicbg

How do I open the 'Sound Settings' dialog you showed in your post? I can only open the Sound dialog (without 'Settings'), and in the Sound dialog there's no 'On' button to turn on a device. Can I open the Sounds Settings in a Terminal window? How? (I'm new to Linux)

As for the newer kernel: I ran LM 6.5 from a live usb stick (linuxmint-21.3-cinnamon-64bit-edge.iso), and that didn't help. No sound.

First, I would suggest opening Sound Settings -> Hardware. You probably also have a second device that is turned off. Plug the hdmi cable into the TV and set the turned off device to On to see if any sound will appear.
2024-03-17_13-29.png
2. Your hardware is very new and needs a newer kernel. If my first tip doesn't help, try installing kernel 6.2, and if necessary 6.5 from Update Manager -> View -> Linux Kernels.

[diabolicbg]

I use MATE and you probably use Cinnamon. There might be a little difference, but you probably have a Sound icon at the bottom right of the clock. Right-clicking should offer a menu and from there, at least in MATE you enter the settings.

[diabolicbg]

If there is no menu option from the volume icon, there must be volume settings in the Control Panel.

[paut]

The only settings I see are these:

https://imgur.com/QYQmYas


https://imgur.com/r3xME2d

And there' s no ' Control Panel' in Cinnamon, as far as I can see.

I use MATE and you probably use Cinnamon. There might be a little difference, but you probably have a Sound icon at the bottom right of the clock. Right-clicking should offer a menu and from there, at least in MATE you enter the settings.

[diabolicbg]

Check what will happen if you mark Digital output and change the profile. I think the hdmi sound should be digital, not analog.

[paut]

It doesn't make any difference if I select Digital output.

Check what will happen if you mark Digital output and change the profile. I think the hdmi sound should be digital, not analog.

[diabolicbg]

Sorry! Clearly someone who knows Cinnamon needs to help.

[paut]

Thanks for trying!

Sorry! Clearly someone who knows Cinnamon needs to help.

[paut]

Hi again @diabolicbg

After I restarted my pc, the hdmi sound connection started working through the S/PDIF profile. The reason for restarting my pc was a minor Linux update that was offered, downloaded and installed today. Maybe there's no connection between this update and the working sound, but somehow the problem was solved (maybe changing the profile to S/PDIF and restarting would have done the job as well).

I can't really explain it, but I shall add [SOLVED] to the topic line.

Sorry! Clearly someone who knows Cinnamon needs to help.

[diabolicbg]

Hi again @diabolicbg

After I restarted my pc, the hdmi sound connection started working through the S/PDIF profile. The reason for restarting my pc was a minor Linux update that was offered, downloaded and installed today. Maybe there's no connection between this update and the working sound, but somehow the problem was solved (maybe changing the profile to S/PDIF and restarting would have done the job as well).

I can't really explain it, so I won't add [SOLVED] to the topic line.

Sometimes you have to restart for the new profile to take effect. I'm glad I was able to help though.

[paut]

And sometimes one makes silly mistakes: everything worked just finoe -- but with 3,5 mm audio jack connected to the amplifier, not the hdmi cable. So back to where I started: the system settings after upgrading ther kernel tot the latest Edge version. The Sound Settings now include a hdmi/dp profile thsat wasn't there in kernel 5.15. I hope someone can see why there' s no sound on my TV via the hdmi/dp cable.

Code: Select all

System:
  Kernel: 6.5.0-26-generic x86_64 bits: 64 compiler: N/A Desktop: Cinnamon 6.0.4 tk: GTK 3.24.33
    wm: muffin vt: 7 dm: LightDM 1.30.0 Distro: Linux Mint 21.3 Virginia base: Ubuntu 22.04 jammy
Machine:
  Type: Desktop System: ZOTAC product: ZBOX- v: XX serial: <superuser required>
  Mobo: ZOTAC model: ZBOX- serial: <superuser required> UEFI: American Megatrends LLC. v: 5.27
    date: 04/19/2023
Battery:
  Device-1: hidpp_battery_0 model: Logitech M585/M590 Multi-Device Mouse serial: <filter>
    charge: 55% (should be ignored) rechargeable: yes status: Discharging
  Device-2: hidpp_battery_1 model: Logitech K370s/K375s Multi-Device Wireless Keyboard
    serial: <filter> charge: 100% (should be ignored) rechargeable: yes status: Discharging
CPU:
  Info: quad core model: Intel N100 bits: 64 type: MCP smt: <unsupported> arch: N/A rev: 0 cache:
    L1: 384 KiB L2: 2 MiB L3: 6 MiB
  Speed (MHz): avg: 2623 high: 3396 min/max: 700/3400 cores: 1: 3396 2: 3097 3: 3302 4: 700
    bogomips: 6451
  Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx
Graphics:
  Device-1: Intel vendor: ZOTAC driver: i915 v: kernel ports: active: HDMI-A-1
    empty: DP-1,DP-2,HDMI-A-2 bus-ID: 00:02.0 chip-ID: 8086:46d1 class-ID: 0300
  Display: x11 server: X.Org v: 1.21.1.4 driver: X: loaded: modesetting unloaded: fbdev,vesa
    gpu: i915 display-ID: :0 screens: 1
  Screen-1: 0 s-res: 1920x1080 s-dpi: 96 s-size: 508x285mm (20.0x11.2") s-diag: 582mm (22.9")
  Monitor-1: HDMI-1 mapped: HDMI-A-1 model: Idek Iiyama PL2473HD res: 1920x1080 hz: 60 dpi: 94
    size: 521x293mm (20.5x11.5") diag: 598mm (23.5") modes: max: 1920x1080 min: 720x400
  OpenGL: renderer: Mesa Intel Graphics (ADL-N) v: 4.6 Mesa 23.2.1-1ubuntu3.1~22.04.2
    direct render: Yes
Audio:
  Device-1: Intel vendor: ZOTAC driver: snd_hda_intel v: kernel bus-ID: 00:1f.3 chip-ID: 8086:54c8
    class-ID: 0403
  Device-2: Zoran Personal Media Division (Nogatech) USB Audio and HID type: USB
    driver: snd-usb-audio bus-ID: 3-4:3 chip-ID: 0573:1573 class-ID: 0300 serial: <filter>
  Sound Server-1: ALSA v: k6.5.0-26-generic running: yes
  Sound Server-2: PulseAudio v: 15.99.1 running: yes
  Sound Server-3: PipeWire v: 0.3.48 running: yes
Network:
  Device-1: Intel driver: iwlwifi v: kernel port: N/A bus-ID: 00:14.3 chip-ID: 8086:54f0
    class-ID: 0280
  IF: wlo1 state: down mac: <filter>
  Device-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet driver: r8169 v: kernel pcie:
    speed: 2.5 GT/s lanes: 1 port: 4000 bus-ID: 01:00.0 chip-ID: 10ec:8168 class-ID: 0200
  IF: enp1s0 state: up speed: 1000 Mbps duplex: full mac: <filter>
  Device-3: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet driver: r8169 v: kernel pcie:
    speed: 2.5 GT/s lanes: 1 port: 3000 bus-ID: 02:00.0 chip-ID: 10ec:8168 class-ID: 0200
  IF: enp2s0 state: down mac: <filter>
Bluetooth:
  Device-1: Intel AX201 Bluetooth type: USB driver: btusb v: 0.8 bus-ID: 3-10:4 chip-ID: 8087:0026
    class-ID: e001
  Report: hciconfig ID: hci0 rfk-id: 0 state: down bt-service: enabled,running rfk-block:
    hardware: no software: yes address: <filter>
Drives:
  Local Storage: total: 476.94 GiB used: 24.9 GiB (5.2%)
  ID-1: /dev/nvme0n1 vendor: Intenso model: N/A size: 476.94 GiB speed: 31.6 Gb/s lanes: 4
    type: SSD serial: <filter> rev: V0926A3 temp: 44.9 C scheme: GPT
Partition:
  ID-1: / size: 467.89 GiB used: 24.9 GiB (5.3%) fs: ext4 dev: /dev/nvme0n1p2
  ID-2: /boot/efi size: 511 MiB used: 6.1 MiB (1.2%) fs: vfat dev: /dev/nvme0n1p1
Swap:
  ID-1: swap-1 type: file size: 2 GiB used: 0 KiB (0.0%) priority: -2 file: /swapfile
USB:
  Hub-1: 1-0:1 info: Hi-speed hub with single TT ports: 1 rev: 2.0 speed: 480 Mb/s
    chip-ID: 1d6b:0002 class-ID: 0900
  Hub-2: 2-0:1 info: Super-speed hub ports: 1 rev: 3.1 speed: 20 Gb/s chip-ID: 1d6b:0003
    class-ID: 0900
  Hub-3: 3-0:1 info: Hi-speed hub with single TT ports: 12 rev: 2.0 speed: 480 Mb/s
    chip-ID: 1d6b:0002 class-ID: 0900
  Device-1: 3-2:2 info: Logitech Unifying Receiver type: Keyboard,Mouse,HID
    driver: logitech-djreceiver,usbhid interfaces: 3 rev: 2.0 speed: 12 Mb/s power: 98mA
    chip-ID: 046d:c52b class-ID: 0300
  Device-2: 3-4:3 info: Zoran Personal Media Division (Nogatech) USB Audio and HID
    type: Audio,HID driver: snd-usb-audio interfaces: 4 rev: 2.0 speed: 12 Mb/s power: 100mA
    chip-ID: 0573:1573 class-ID: 0300 serial: <filter>
  Device-3: 3-10:4 info: Intel AX201 Bluetooth type: Bluetooth driver: btusb interfaces: 2
    rev: 2.0 speed: 12 Mb/s power: 100mA chip-ID: 8087:0026 class-ID: e001
  Hub-4: 4-0:1 info: Super-speed hub ports: 4 rev: 3.1 speed: 10 Gb/s chip-ID: 1d6b:0003
    class-ID: 0900
Sensors:
  System Temperatures: cpu: 48.0 C mobo: N/A
  Fan Speeds (RPM): N/A
Repos:
  Packages: apt: 2237
  No active apt repos in: /etc/apt/sources.list
  Active apt repos in: /etc/apt/sources.list.d/official-package-repositories.list
    1: deb http: //packages.linuxmint.com virginia main upstream import backport
    2: deb http: //archive.ubuntu.com/ubuntu jammy main restricted universe multiverse
    3: deb http: //archive.ubuntu.com/ubuntu jammy-updates main restricted universe multiverse
    4: deb http: //archive.ubuntu.com/ubuntu jammy-backports main restricted universe multiverse
    5: deb http: //security.ubuntu.com/ubuntu/ jammy-security main restricted universe multiverse
Info:
  Processes: 212 Uptime: 1h 30m wakeups: 31 Memory: 15.35 GiB used: 1.53 GiB (10.0%) Init: systemd
  v: 249 runlevel: 5 Compilers: gcc: 11.4.0 alt: 11/12 Client: Unknown python3.10 client
  inxi: 3.3.13

Sometimes you have to restart for the new profile to take effect. I'm glad I was able to help though.

[diabolicbg]

As an experiment I would suggest temporarily turning off PulseAudio, which has been bothering quite a few people here on the forum. You could use this tutorial, which also allows for recovery on failure: https://trendoceans.com/enable-pipewire ... in-ubuntu/
My sound also only works with PipeWire.

[paut]

I'm afraid that's too complicated for me, as a newbie user of Linux.

As an experiment I would suggest temporarily turning off PulseAudio, which has been bothering quite a few people here on the forum. You could use this tutorial, which also allows for recovery on failure: https://trendoceans.com/enable-pipewire ... in-ubuntu/
My sound also only works with PipeWire.

[diabolicbg]

I'm afraid that's too complicated for me, as a newbie user of Linux.

As an experiment I would suggest temporarily turning off PulseAudio, which has been bothering quite a few people here on the forum. You could use this tutorial, which also allows for recovery on failure: https://trendoceans.com/enable-pipewire ... in-ubuntu/
My sound also only works with PipeWire.

There is nothing complicated - you open Terminal, copy and execute the commands in the purple rectangles /without $ in front/ one by one until "Replace/Disable PipeWire with PulseAudio". Then you restart the computer and check the sound. If it doesn't work and you want to go back, you execute the commands after "Replace/Disable PipeWire with PulseAudio". And you reboot again.

[SMG]

My Zotac Zbox CI343 doesn't give any sound when connected to my (not smart) Samsung TV through a hdmi cable (the TV set connects to an amplifier). What can be the cause? How can I test what' s wrong? Some system info:

Please supply the complete system info. When dealing with HDMI connections that means the graphics driver is installed but we know nothing about the graphics on your system.

Please open the System Reports app and click the System Information tab on the left. Your computer's information should come up in the right pane. Then click the Copy button in the lower right and paste the results into a reply window here so we can see how Linux Mint views your hardware.

The partial data you posted indicates you are running Xfce so I'm confused as to why Cinnamon is being discussed.

Also, does the sound work if you don't use the amplifier and just have the TV connected to the computer?

[diabolicbg]

The partial data you posted indicates you are running Xfce so I'm confused as to why Cinnamon is being discussed.

Because I'm not very good with the eyes and I didn't see. I assumed the OP was using Cinnamon, and I don't know why he didn't refute me.

[paut]

Thanks for looking into my sound problem.

The sound does not play via the TV directly (without the amplifier), and I did have Xfce when I first opened tis topic, but switched to Cinnamon for testing purposes. Now I'm running Cinnamon with the 6.5 Edge kernel (which doesn' t make any difference for the sound problem). Please find my complete system settings below.

Code: Select all

System:
  Kernel: 6.5.0-26-generic x86_64 bits: 64 compiler: N/A Desktop: Cinnamon 6.0.4 tk: GTK 3.24.33
    wm: muffin vt: 7 dm: LightDM 1.30.0 Distro: Linux Mint 21.3 Virginia base: Ubuntu 22.04 jammy
Machine:
  Type: Desktop System: ZOTAC product: ZBOX- v: XX serial: <superuser required>
  Mobo: ZOTAC model: ZBOX- serial: <superuser required> UEFI: American Megatrends LLC. v: 5.27
    date: 04/19/2023
Battery:
  Device-1: hidpp_battery_0 model: Logitech K370s/K375s Multi-Device Wireless Keyboard
    serial: <filter> charge: 100% (should be ignored) rechargeable: yes status: Discharging
  Device-2: hidpp_battery_1 model: Logitech M585/M590 Multi-Device Mouse serial: <filter>
    charge: 55% (should be ignored) rechargeable: yes status: Discharging
CPU:
  Info: quad core model: Intel N100 bits: 64 type: MCP smt: <unsupported> arch: N/A rev: 0 cache:
    L1: 384 KiB L2: 2 MiB L3: 6 MiB
  Speed (MHz): avg: 3216 high: 3315 min/max: 700/3400 cores: 1: 3121 2: 3121 3: 3308 4: 3315
    bogomips: 6451
  Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx
Graphics:
  Device-1: Intel vendor: ZOTAC driver: i915 v: kernel ports: active: HDMI-A-1
    empty: DP-1,DP-2,HDMI-A-2 bus-ID: 00:02.0 chip-ID: 8086:46d1 class-ID: 0300
  Display: x11 server: X.Org v: 1.21.1.4 driver: X: loaded: modesetting unloaded: fbdev,vesa
    gpu: i915 display-ID: :0 screens: 1
  Screen-1: 0 s-res: 1920x1080 s-dpi: 96 s-size: 508x285mm (20.0x11.2") s-diag: 582mm (22.9")
  Monitor-1: HDMI-1 mapped: HDMI-A-1 model: Idek Iiyama PL2473HD res: 1920x1080 hz: 60 dpi: 94
    size: 521x293mm (20.5x11.5") diag: 598mm (23.5") modes: max: 1920x1080 min: 720x400
  OpenGL: renderer: Mesa Intel Graphics (ADL-N) v: 4.6 Mesa 23.2.1-1ubuntu3.1~22.04.2
    direct render: Yes
Audio:
  Device-1: Intel vendor: ZOTAC driver: snd_hda_intel v: kernel bus-ID: 00:1f.3 chip-ID: 8086:54c8
    class-ID: 0403
  Device-2: Zoran Personal Media Division (Nogatech) USB Audio and HID type: USB
    driver: snd-usb-audio bus-ID: 3-4:3 chip-ID: 0573:1573 class-ID: 0300 serial: <filter>
  Sound Server-1: ALSA v: k6.5.0-26-generic running: yes
  Sound Server-2: PulseAudio v: 15.99.1 running: yes
  Sound Server-3: PipeWire v: 0.3.48 running: yes
Network:
  Device-1: Intel driver: iwlwifi v: kernel port: N/A bus-ID: 00:14.3 chip-ID: 8086:54f0
    class-ID: 0280
  IF: wlo1 state: down mac: <filter>
  Device-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet driver: r8169 v: kernel pcie:
    speed: 2.5 GT/s lanes: 1 port: 4000 bus-ID: 01:00.0 chip-ID: 10ec:8168 class-ID: 0200
  IF: enp1s0 state: up speed: 1000 Mbps duplex: full mac: <filter>
  Device-3: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet driver: r8169 v: kernel pcie:
    speed: 2.5 GT/s lanes: 1 port: 3000 bus-ID: 02:00.0 chip-ID: 10ec:8168 class-ID: 0200
  IF: enp2s0 state: down mac: <filter>
Bluetooth:
  Device-1: Intel AX201 Bluetooth type: USB driver: btusb v: 0.8 bus-ID: 3-10:4 chip-ID: 8087:0026
    class-ID: e001
  Report: hciconfig ID: hci0 rfk-id: 0 state: down bt-service: enabled,running rfk-block:
    hardware: no software: yes address: <filter>
Drives:
  Local Storage: total: 476.94 GiB used: 24.92 GiB (5.2%)
  ID-1: /dev/nvme0n1 vendor: Intenso model: N/A size: 476.94 GiB speed: 31.6 Gb/s lanes: 4
    type: SSD serial: <filter> rev: V0926A3 temp: 44.9 C scheme: GPT
Partition:
  ID-1: / size: 467.89 GiB used: 24.91 GiB (5.3%) fs: ext4 dev: /dev/nvme0n1p2
  ID-2: /boot/efi size: 511 MiB used: 6.1 MiB (1.2%) fs: vfat dev: /dev/nvme0n1p1
Swap:
  ID-1: swap-1 type: file size: 2 GiB used: 0 KiB (0.0%) priority: -2 file: /swapfile
USB:
  Hub-1: 1-0:1 info: Hi-speed hub with single TT ports: 1 rev: 2.0 speed: 480 Mb/s
    chip-ID: 1d6b:0002 class-ID: 0900
  Hub-2: 2-0:1 info: Super-speed hub ports: 1 rev: 3.1 speed: 20 Gb/s chip-ID: 1d6b:0003
    class-ID: 0900
  Hub-3: 3-0:1 info: Hi-speed hub with single TT ports: 12 rev: 2.0 speed: 480 Mb/s
    chip-ID: 1d6b:0002 class-ID: 0900
  Device-1: 3-2:2 info: Logitech Unifying Receiver type: Keyboard,Mouse,HID
    driver: logitech-djreceiver,usbhid interfaces: 3 rev: 2.0 speed: 12 Mb/s power: 98mA
    chip-ID: 046d:c52b class-ID: 0300
  Device-2: 3-4:3 info: Zoran Personal Media Division (Nogatech) USB Audio and HID
    type: Audio,HID driver: snd-usb-audio interfaces: 4 rev: 2.0 speed: 12 Mb/s power: 100mA
    chip-ID: 0573:1573 class-ID: 0300 serial: <filter>
  Device-3: 3-10:4 info: Intel AX201 Bluetooth type: Bluetooth driver: btusb interfaces: 2
    rev: 2.0 speed: 12 Mb/s power: 100mA chip-ID: 8087:0026 class-ID: e001
  Hub-4: 4-0:1 info: Super-speed hub ports: 4 rev: 3.1 speed: 10 Gb/s chip-ID: 1d6b:0003
    class-ID: 0900
Sensors:
  System Temperatures: cpu: 27.8 C mobo: N/A
  Fan Speeds (RPM): N/A
Repos:
  Packages: apt: 2237
  No active apt repos in: /etc/apt/sources.list
  Active apt repos in: /etc/apt/sources.list.d/official-package-repositories.list
    1: deb http: //packages.linuxmint.com virginia main upstream import backport
    2: deb http: //archive.ubuntu.com/ubuntu jammy main restricted universe multiverse
    3: deb http: //archive.ubuntu.com/ubuntu jammy-updates main restricted universe multiverse
    4: deb http: //archive.ubuntu.com/ubuntu jammy-backports main restricted universe multiverse
    5: deb http: //security.ubuntu.com/ubuntu/ jammy-security main restricted universe multiverse
Info:
  Processes: 221 Uptime: 0m wakeups: 4 Memory: 15.35 GiB used: 1.38 GiB (9.0%) Init: systemd
  v: 249 runlevel: 5 Compilers: gcc: 11.4.0 alt: 11/12 Client: Unknown python3.10 client
  inxi: 3.3.13

Please open the System Reports app and click the System Information tab on the left. Your computer's information should come up in the right pane. Then click the Copy button in the lower right and paste the results into a reply window here so we can see how Linux Mint views your hardware.
The partial data you posted indicates you are running Xfce so I'm confused as to why Cinnamon is being discussed.
Also, does the sound work if you don't use the amplifier and just have the TV connected to the computer?