Need GRUB edit to control brightness. OK with uBlue?

General
1

Can I make GRUB edits stick with Aurora?

I have a mid 2010 iMac that works perfectly with Aurora except for one little detail: screen brighness can’t be controlled via keyboard or via the display brightness slider in Plasma.

The machine has Radeon HD 4670 graphics and apparently this card might need some GRUB or /sys/class/backlight/radeon_bl0 editing to work.

Is it possible to make GRUB edits “stick” with uBlue? If so, what is the recommended way to add GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pcie_aspm=force acpi_backlight=native"?

Is sudo rpm-ostree kargs the way?

2

Reporting back…

Can confirm that this worked perfectly:
sudo rpm-ostree kargs --append=”pcie_aspm=force acpi_backlight=native”

Haven’t tried controlling brightness with an Apple keyboard, but the brightness slider from tray bar works :ok_hand:

3

Recently we had a lot of issues with users layering packages with rpm-ostree. Layering packages can stop system updates and cause a myriad of issues. Just keep that in mind. Layering packages is not recommended and probably will cause issues in the long run.

4

Thanks. So rpm-ostree kargs also counts as layering packages?

5

Not sure but easy way to check. Use

rpm-ostree status

in terminal and if it shows any layered packages, it means it’s layered. If not, you should be good. Just realized you didn’t install anything with the rpm-ostree command so you might be okay here :slight_smile:

6

rpm-ostree status does not seem to indicate any layering. :blush:

7

No, that just adds kernel args and is fine to use

8

What issues are you referring to? I hope it’s not the Bazaar related thread, because that’s a Bazaar issue and not a rpm-ostree layer problem.