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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 omcnoe on Wednesday December 10, 2025 @06:35PM (#46225605)
Brightness control on external monitors has never been supported in Windows though, partially due to issues with displays that have poor write endurance on internal storage.
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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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Re:Valve: HDMI Forum Continues to Block HDMI 2.1 for Linux by poolnoodle on Wednesday December 10, 2025 @06:48PM (#46225736)
I change brightness all the time with a little tool called Monitorian.
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Re:Valve: HDMI Forum Continues to Block HDMI 2.1 for Linux by user_7832 on Thursday December 11, 2025 @04:13AM (#46229224)
It might not be an "internal windows" tool, but I have controlled an ancient monitor (I think over VGA?) using a 3rd part app on windows. The buttons had broken, but software control worked just fine.
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