No irq handler for vector / Failed to start Load/Save Screen Backlight Brightness of backlight:acpi_video0

Failed to start Load/Save Screen Backlight Brightness of backlight:acpi_video0.

Is this something to worry about? My system runs without problems, this is the only error that appears on boot.

change your title

see this

I don’t have problem booting as i said. it is only the error.
I entered the command from your shared post and it stays the same.
Why do i have to change the title? It is what comes before the error:

[ 0.004006] ___common_interrupt: 1.55 No irq handler for vector
[ 0.004006] ___common_interrupt: 2.55 No irq handler for vector
[ 0.004006] ___common_interrupt: 3.55 No irq handler for vector

In fact, maybe because of the disable command from the other post, now it adds “common_interrupt”.

Please try this:
When you boot, while in the GRUB menu and you selected to boot the installer, pres e and add, to the kernel parameters line, this pci=nomsi,noaer
You can place it right after quiet .
Then press F10 to continue booting. You might have to do the same once the system is installed and you boot from it. Look on how to permanently add boot flags to boot.

If this helps to not show that message, then you can make it permanent by adding it to /etc/default/grub and then update grub.

I am also seeing this error on my ThinkPad with an Ryzen 5 3500U APU.
It does not trigger any problems here, I just ignore it (I have that error since I got the notebook last year)

this does not solve it for me. But system seems to work OK although message appears every boot.

It does not change anything Any other idea? By the way my GRUB line looks like this. Maybe changing what comes after??

GRUB_CMDLINE_LINUX_DEFAULT=“quiet pci=nomsi,noaer loglevel=3 rd.systemd.show_status=auto rd.udev.log_priority=3 touch ~/.hushlogin”

Also have the same problem on my HP pavilion laptop.
Just switched this machine from Ubuntu 20.04 to Manjaro KDE
I am more the happy with this OS but I keep getting these messages when booting and shutting down.

[gochila@Getruda ~]$ systemctl status systemd-backlight@backlight:acpi_video0.service
â—Ź systemd-backlight@backlight:acpi_video0.service - Load/Save Screen Backli>
Loaded: loaded (/usr/lib/systemd/system/systemd-backlight@.service; st>
Active: failed (Result: exit-code) since Sun 2020-08-30 12:26:38 CEST;>
Docs: man:systemd-backlight@.service(8)
Process: 793 ExecStart=/usr/lib/systemd/systemd-backlight load backligh>
Main PID: 793 (code=exited, status=1/FAILURE)

kol 30 12:26:38 Getruda systemd[1]: Starting Load/Save Screen Backlight Bri>
kol 30 12:26:38 Getruda systemd-backlight[793]: Failed to get backlight or >
kol 30 12:26:38 Getruda systemd[1]: systemd-backlight@backlight:acpi_video0>
kol 30 12:26:38 Getruda systemd[1]: systemd-backlight@backlight:acpi_video0>
kol 30 12:26:38 Getruda systemd[1]: Failed to start Load/Save Screen Backli>

Im ona ryzen 3000 system as well and did not have this problem until today, after a bios update.
Maybe its something with the current AGESA version?
Or some bios option thats different for me now, after the update.
Whatever it is, i couldnt figure out how to solve it yet.

This solved the issue for me, no more errors and it boots normally into manjaro.
You can just copy the whole string in a tty.
To enter a tty just press ctrl+alt+f3 when the error appears at boot

sudo sed "s/\(GRUB_CMDLINE_LINUX=\)\"\"/\1\"acpi_osi=Linux acpi_backlight=vendor\"/" /etc/default/grub -i

after that

sudo update-grub

then just reboot and everything should be fine.

hope this will help you :smiley:


Hi @robxsku, your post helped me solve the problem.
Tanks in advance.

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That didnt do anything for me unfortunately…
A little digging revealed that this is apparently a known kernel bug, that luckily doesent seem to affect functionality in any way.
Thanks for trying to help out tho, much appreciated. :slight_smile:

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