I went through the steps to determine if my laptop is affected and got stuck (I’m hardly proficient in linux) but I think my laptop would be affected. Does anyone know if this will in fact affect Manjaro down the line?
returns only one result - and whether that is one of
“intel_backlight”, “nouveau_bl”, “amdgpu_bl0” or “radeon_bl0”
For me the result is:
ls /sys/class/backlight
intel_backlight
so:
this condition is met (and I could be affected)
Next is to add the
acpi_backlight=video
parameter to the grub command line and reboot with that change
You do this by editing /etc/default/grub
and add it to the line starting with: GRUB_CMDLINE_LINUX_DEFAULT=
and add that to what is already there, inside the quotes
(be careful - no typos, if at all possible )
followed by
update-grub
and a reboot
Then do the check again.
I now have this result:
ls /sys/class/backlight
acpi_video0 acpi_video1 intel_backlight
Hi thanks for responding.
I got stuck here:
He says: if you don’t have an “acpi_video0” entry please first do “cat /proc/cmdline” and check that “acpi_backlight=video” is present there.
So I did this and it is not. I have no idea what this means–if I made a mistake appending to grub or if my laptop is affected. My grub was cut/paste appended, so no typos:
GRUB_CMDLINE_LINUX_DEFAULT=“quiet apparmor=1 security=apparmor udev.log_priority=3 acpi_backlight=video”
Any clarification or guidance you might have, I’d really appreciate!
It is kind of the other way around - at least as I understood it
What he said:
a second check is to boot with “acpi_backlight=video” added to the kernel commandline and then run “ls /sys/class/backlight” again, if you now additionally also have an “acpi_video0” entry then your laptop should work fine with 6.1, if you don’t have an “acpi_video0” entry please first do “cat /proc/cmdline” and check that “acpi_backlight=video” is present there.
cat /proc/cmdline
just verifies that you actually and successfully did the change
The result of that command should print the same as is in: GRUB_CMDLINE_LINUX_DEFAULT
in /etc/default/grub
There is another way to add that acpi_backlight=video parameter
by editing the command line directly at boot time
This is not permanent, like the method that I described.
You just press “E” for edit at the grub screen …
Yes, so after I appended my grub, rebooted, and ran ls /sys/class/backlight again, I still have no “acpi_video0” entry. So then I did the cat /proc/cmdline, which also shows no “acpi_backlight=video” .
Also, all of the text outputs he asks for if you think you are affected returned nothing for me, except$ sudo acpidump -o acpidump.txt
sudo: acpidump: command not found
Hi, just to make sure: you don’t write that you actually updated grub, as @Nachlese wrote, after appending to its GRUB_CMDLINE_LINUX_DEFAULT= configuration. If you don’t run the grub update, /proc/cmdline will not change.
Well that was the crux. I updated grub and now it shows the magic
ls /sys/class/backlight
acpi_video0 intel_backlight
So it looks like I get to keep using my old laptop.
dont forget to revert back to original kernel parameters. if you keep acpi_backlight=video in your kernel parameters, backlight controls may not function anymore
it has nothing to do with manjaro, anyone using kernel 6.1 on any distro will be subject to it
)