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A comment on Valve: HDMI Forum Continues to Block HDMI 2.1 for Linux. Parent comment

Re:Valve: HDMI Forum Continues to Block HDMI 2.1 for Linux by tylerflick on Wednesday December 10, 2025 @07:16PM (#46225993)
Monitor brightness is controlled over CEC which is just i2c. Windows most certainly supports this on an OS level.
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Re:Valve: HDMI Forum Continues to Block HDMI 2.1 for Linux by fainpul on Thursday December 11, 2025 @04:05AM (#46229176)
Yes, I've used this in the past:

https://learn.microsoft.com/en-us/windows/win32/api/highleve...

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