[SOLVED] HP Victus, Pop OS, dim screen, reversed brightness controls

[guennx]

I have created this post to share my solution for this problem (HP forum didn't allow me to reactivate my previous question nor reply it, no idea why). I'm using Pop OS, which uses systemd-boot instead of grub. I believe this solution can help for other operating systems that use systemd-boot. If you are using another OS, that uses grub instead systemd-boot, I highly recommend you to check this post.

First I added "acpi_backlight=video" to  kernel boot toggles. You can also try "acpi_backlight=vendor", however, in the later steps, I was unable change the brightness level with the brightness control keys on my keyboard or with the slider. For adding it, I ran the following command

sudo kernelstub -a "acpi_backlight=video"

Then I verified that the new kernel boot toggle was added by running the command below

sudo kernelstub -p

After that I rebooted the system and the brightness was max. However brightness keys on my keyboard and the brightness slider weren't functioning at all. For that I installed Soft Brightness Plus. Then the brightness keys and the slider were functional, so my issue was resolved.

If this didn't solve your problem, you can remove the kernel boot toggle you added with this command:

sudo kernelstub -d "acpi_backlight=video"