Valve: HDMI Forum Continues to Block HDMI 2.1 for Linux

Re:Valve: HDMI Forum Continues to Block HDMI 2.1 for Linux by Rohansi on Wednesday December 10, 2025 @05:12PM (#46224647)

> HDMI CEC works pretty decent these days, all the kinks have been worked out over the years and the only time it bugs out is if you use Chinese brands

I don't know. I have an LG TV and it does not support turning the display on/off with HDMI CEC. Everything else seems to work but it intentionally ignores those commands.

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Re:Valve: HDMI Forum Continues to Block HDMI 2.1 for Linux by tim-- on Wednesday December 10, 2025 @06:48PM (#46225744)

Have you turned off SIMPLINK? (LG's older name for CEC).

Option 1 (Hidden Menu Method)

* Press the Mute button repeatedly until the hidden menu appears; ensure Auto Power Sync is enabled.

* Go to General → Devices → TV Management and disable Quick Start+.

* Go to General → System → Additional Settings → Home Settings and turn off both options.

Option 2 (Settings Menu Method, webOS)

* Press Settings on the remote and open All Settings.

* Navigate to General → Devices.

* Turn SIMPLINK (HDMI-CEC) ON. (webOS 6.0+, enabling SIMPLINK automatically enables external device control).

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Re:Valve: HDMI Forum Continues to Block HDMI 2.1 for Linux by Rohansi on Wednesday December 10, 2025 @09:05PM (#46226783)

No, it is enabled. Other CEC commands like changing the active input work.

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Re:Valve: HDMI Forum Continues to Block HDMI 2.1 for Linux by jorvi on Wednesday December 10, 2025 @09:23PM (#46226908)

[Older] LG TVs do not implement CEC Standby command. You need a hardware mod: https://github.com/Pulse-Eight/libcec/issues/363#issuecommen...

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Re:Valve: HDMI Forum Continues to Block HDMI 2.1 for Linux by Rohansi on Thursday December 11, 2025 @03:15AM (#46228884)

That's too bad. It's only about five years old now. Old but not unreasonably old.

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