Brightness Not Adjustable in Ultimate Mode on Zephyrus G16 GU603VI (RTX 4070, 2022)

[Undarned]

Hi, I'm using an ASUS ROG Zephyrus G16 GU603VI (2022) with the NVIDIA RTX 4070.

On Ultimate mode, I can't adjust the brightness of the built-in display at all.

Brightness adjustment works fine in Standard and Eco modes.

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✅ What I've tried so far:

• Uninstalled and Reinstalled Intel and NVIDIA GPU drivers
• Switched to Eco/Standard mode and back to Ultimate mode
• Held power button for 40 seconds after shutdown (EC reset)
• Enabled Enable GPU on shutdown in G-Helper
• Updated Windows and NVIDIA drivers

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🧩 The problem:

• The brightness slider is ineffective in Ultimate mode
• This only happens when running dGPU-only (Ultimate mode)
• Everything works normally in Standard (hybrid) mode

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Would really love any advice or help as the brightness is really low on my laptop display.

Thanks in advance for any help or insight!

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[seerge]

@Undarned hello, it's all handled by drivers and windows :) You may want to do a clean drivers reinstall using DDU

[seerge]

Did you use DDU ?

[Undarned]

Yes

[seerge]

Then try older drivers or drivers from asus itself :) I don't know what else to suggest.

[Undarned]

What ASUS driver are you talking about?

[seerge]

The ones at https://www.asus.com/supportonly/gu603vi/helpdesk_download/ (or correspondingly under G-Helper's Updates section which is the same page)