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vcgencmd display_power 0 does not turn off screen after updating Raspberry Pi OS #727
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It sounds like you have started using the KMS driver, having moved from either the FKMS or the legacy graphics stack. That requires using the standard Linux command for turning displays on and off, not vcgencmd |
If that is the case, then I did not do this switch intentionally. The only change I did, before things got broken, was to run |
I just did a fresh reinstall of Raspberry Pi OS and installed the new updates on another rpi . Then I tested turning off the screen with Can anyone try reproducing these on their rpi? |
See comment from JamesH65. "vcgencmd display_power 0" is only supported by the legacy FKMS display stack (vc4-fkms-v3d). The default is now KMS (vc4-fkms-v3d) Use the xset dpms commands to control display power with KMS |
See also this forum post. https://forums.raspberrypi.com/viewtopic.php?p=2036401&hilit=display_power#p2036401 |
Thanks for helping out! I managed to turn the screen off/on with
Important note: Screen Blanking must be enabled if using |
Describe the bug
After updating Raspberry Pi OS (bullseye) on Raspberry Pi 4 with
sudo apt update && sudo upgrade -y
yesterday, I'm no longer able to turn on/off my LCD screen (connected with HDMI) with commandvcgencmd display_power 0 / 1
and the screen stays just stays turned on. This command worked as expected prior to the update.To reproduce
List the steps required to reproduce the issue.
Expected behaviour
vcgencmd display_power 0
turns screen off andvcgencmd display_power
shows current power state0
Actual behaviour
vcgencmd display_power 0
does not turn screen off andvcgencmd display_power
shows current power state1
System
Logs
If applicable, add the relevant output from
dmesg
or similar.Additional context
Add any other relevant context for the problem.
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