How can i set the screen brightness?

If I boot without any options, the A9RP will hang.
However Haiku Beta 3 works very well on Thinkpad T410i. Even the wifi is detected, and makes everything easier. I also just received a used T400 I bought online a couple of weeks ago, I haven’t tested Haiku on it yet.

ah, then please open a bug report, and possibly test the nightly branch to get this fixed. beta3 is too old by now to reasonably provide support

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Ok thank you.