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I am running 12.10 on an HP DV7-6197CA.

I had fan issues which I was able to correct by changing this line in GRUB;

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

to:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pcie_aspm=force"

So I have read that if I change that line to include acpi_backlight=vendor I will be able to adjust brightness, something I currently cannot do.

What I am wondering is can I still leave the pcie_aspm=force in the line? And should it be before or after acpi_backlight parameter?

Any help is greatly appreciated!

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1 Answer

Order doesn't matter here.

Kernel parameters are separated by spaces and that's about it. Your line will become:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pcie_aspm=force acpi_backlight=vendor"

and is equivalent to

GRUB_CMDLINE_LINUX_DEFAULT="pcie_aspm=force quiet acpi_backlight=vendor splash"

or any other rearrangement of orders.

They're independent

Kernel parameters aren't related to each other. Specifying a parameter/value there for the PCIe subsystem are totally irrelevant for the ACPI/backlight subsystem. Just mix them up!

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