Disable HDMI in Bullseye

[oicfar]

Hi,

I switched to Bullseye release and I want disable HDMI. The command which worked in Buster isn't working now:

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$ tvservice --off
tvservice is not supported when using the vc4-kms-v3d driver.
Similar features are available with standard linux tools
such as modetest from libdrm-tests.

I didn't find any solution.


Thx
Rafal

[jahboater]

There is:

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vcgencmd display_power 0

but I don't think its the same thing.

"tvservice" has been a Raspbery Pi tool for a very long time, it would be nice to know what has replaced it.

[oicfar]

There is:

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vcgencmd display_power 0

but I don't think its the same thing.

"tvservice" has been a Raspbery Pi tool for a very long time, it would be nice to know what has replaced it.

With tvservice --off you could save power if you run the Raspi headless.

[jahboater]

With tvservice --off you could save power if you run the Raspi headless.

Yes, but the "tvservice" command appears to be missing from bullseye.

[tontonfred]

Here is a one way to disable HDMI in Bullseye (there may be others). If you are running the Pi headless (or are otherwise not interested in using the newer G2 driver), you can switch back to the legacy G1 driver in raspi-config (Advanced / GL driver). tvservice will then become available again, allowing HDMI to be powered off.

[oicfar]

Here is a one way to disable HDMI in Bullseye (there may be others). If you are running the Pi headless (or are otherwise not interested in using the newer G2 driver), you can switch back to the legacy G1 driver in raspi-config (Advanced / GL driver). tvservice will then become available again, allowing HDMI to be powered off.

Hm ... I don't see this option

My raspi-config version is 20211203 and I don't have Advanced / GL driver option. An I have tvservice, but

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$ tvservice off
tvservice is not supported when using the vc4-kms-v3d driver.
Similar features are available with standard linux tools
such as modetest from libdrm-tests.

[klricks]

Here is a one way to disable HDMI in Bullseye (there may be others). If you are running the Pi headless (or are otherwise not interested in using the newer G2 driver), you can switch back to the legacy G1 driver in raspi-config (Advanced / GL driver). tvservice will then become available again, allowing HDMI to be powered off.

That option was removed from raspi-config. Now to get legacy mode you can edit /boot/config.txt and disable the kms driver.

[DirtyAngelica]

Has anyone figured out an easier way to disable HDMI in Bullseye without disabling KMS driver?

[aBUGSworstnightmare]

Assuming your display is connected to HDMI0 connector (linux naming is HDMI-1) have you tried

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xrandr --output HDMI-1 --off

or add below to the kernel command line (cmdline.txt)

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video=HDMI-1:d

[RDPUser]

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xrandr --output HDMI-1 --off

This doesn't work for me. Message

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warning: output HDMI-1 not found; ignoring

I've switched to old driver and executed

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tvservice --off

Then energy consumption goes down from 0.11A to 0.07A, so saving about 40 mA. That is about 1/3 power saving.

This command works when you go to raspi-config --> Advanced options --> GL driver. Then it dowloads about 30.5 MB and installs about 131 MB, but then Legacy driver can be selected used and power can be saved.

I didn't try

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video=HDMI-1:d

because then video would be always off (if working at all). But the advantage of tvservice --off is that you can execute it about 5 minutes after boot. So if there is a problem some time you can easily connect display cable, disable tvservice --off and do debugging why something isn't working.

Would be great if there would be an equal option for the new drivers.

[jamesh]

tvservice will not work, ever AFAIK, on the KMS driver.

You'll need to use the appropriate commands for DRM/KMS.

When you used HDMI-1 in the above examples, what happens when you replace with HDMI-2? Get a list of attached displays and their names by just using xrandr by itself. I just tried this and it worked on a Pi4 with HDMI-1

// To turn off
xrandr --output HDMI-1 --off
//to turn on.
xrandr --output HDMI-1 --auto

[RDPUser]

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xrandr
Screen 0: minimum 0 x 0, current 5760 x 1080, maximum 32768 x 32768
default connected primary 5760x1080+0+0 1523mm x 285mm
   5760x1080      0.00*

Trying xrandr --output "Screen 0" --off or xrandr --output Screen-0 --off doesn't work.

Power consumption is still about 30 mA higher than with Buster and tvservice -o

I have to mention that I had to install xrandr via sudo apt install x11-xserver-utils whereas tvservice was shipped out of the box. I'm using Raspberry PI OS lite.

[jamesh]

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xrandr
Screen 0: minimum 0 x 0, current 5760 x 1080, maximum 32768 x 32768
default connected primary 5760x1080+0+0 1523mm x 285mm
   5760x1080      0.00*

Trying xrandr --output "Screen 0" --off or xrandr --output Screen-0 --off doesn't work.

Power consumption is still about 30 mA higher than with Buster and tvservice -o

I have to mention that I had to install xrandr via sudo apt install x11-xserver-utils whereas tvservice was shipped out of the box. I'm using Raspberry PI OS lite.

Odd, its says "default" where mine says "HDMI-1", so you could try "default" as the screen name.

Are you sure you are using Bullseye and are using the KMS driver?

[RDPUser]

Its a completly new installed image "2022-01-28-raspios-bullseye-armhf-lite.zip" without any updates.

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lsb_release -a
No LSB modules are available.
Distributor ID: Raspbian
Description:    Raspbian GNU/Linux 11 (bullseye)
Release:        11
Codename:       bullseye

Using default does also not work:

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xrandr --output default --off
xrandr: Configure crtc 0 failed
X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  139 (RANDR)
  Minor opcode of failed request:  7 (RRSetScreenSize)
  Serial number of failed request:  21
  Current serial number in output stream:  22

tvservice which is available without explicitly installing it indicates that the KMS driver is used.

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 tvservice -o
tvservice is not supported when using the vc4-kms-v3d driver.
Similar features are available with standard linux tools
such as modetest from libdrm-tests.

I did sudo apt update && sudo apt upgrade && sudo reboot but behaviour stays the same.

[cleverca22]

Trying xrandr --output "Screen 0" --off or xrandr --output Screen-0 --off doesn't work.

Power consumption is still about 30 mA higher than with Buster and tvservice -o

i suspect that may be a limitation of the new kms drivers, not turning off as much peripherals as the old dispmanx stack

there is a master enable flag in the HVS that seems to turn a large chunk of it off, but can only be used if all displays are shutdown

[RDPUser]

Trying xrandr --output "Screen 0" --off or xrandr --output Screen-0 --off doesn't work.

Power consumption is still about 30 mA higher than with Buster and tvservice -o

i suspect that may be a limitation of the new kms drivers, not turning off as much peripherals as the old dispmanx stack

there is a master enable flag in the HVS that seems to turn a large chunk of it off, but can only be used if all displays are shutdown

How can this master enable flag be used? I have no displays connected so this would be ideal to save power.

[cleverca22]

https://github.com/librerpi/lk-overlay/ ... #L317-L320

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  *REG32(SCALER_DISPCTRL) &= ~SCALER_DISPCTRL_ENABLE; // disable HVS
  *REG32(SCALER_DISPCTRL) = SCALER_DISPCTRL_ENABLE // re-enable HVS
    | DSP3_MUX(3)
    | 0x7f; // irq en

i believe clearing that bit in the main control register will turn a large chunk of the HVS off, which may reduce power usage
the problem then, is finding the right place in https://github.com/raspberrypi/linux/tr ... pu/drm/vc4 to modify
to turn things off when not in use, and to turn it back on and fully re-initialize the hvs, when it i needed again