Ubuntu 23.04: Adjusting backlight is unavailable under `Software Rendering`.

Asked by Larry Wei

After upgrading to `Ubuntu Lunar Lobster`, the backlight adjusting is unavailable under `Software Rendering` and the brightness of my laptop is almost the maximal now. I don't know if you have the same situation. I ask for help.

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actionparsnip (andrew-woodhead666) said :

I suggest you report a bug. Lunar is not stable and not ready. It isn't for casual users yet

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