Back in August 2017, I started a thread asking how I might get rid of the above ACPI error, whenever I booted the Manjaro17-xfce setup on my 6-year-old 10" Samsung N145 netbook (CPU= Intel Atom N455), with the installed 4.9 kernel. That thread is now closed, but you can see the original post at: [UNSOLVED] ACPI Error: [CAPB] Namespace lookup failure, AE_ALREADY_EXISTS - what does this error on booting mean & how do I resolve it?
Apart from this ACPI error, the netbook continues to run very smoothly with Manjaro-xfce. However, I have today found a very simple solution for removing this boot-up error and would like to share it with you, after resolving a similar issue with a 10-year-old Toshiba Satellite A300 running PCLinuxOS-xfce. It involves simply substituting the 4.9 kernel (4.9.74-2) for the 4.4 kernel (4.4.109-2). I have used the GUI method in Manjaro to remove the ACPI error, as follows:
- Open Manjaro Settings Manager (type in search bar after opening menu)
- Click on Kernel icon (shown as a penguin)
- You will see a list of kernel available: scroll down to the current 4.4 version available
- Click “Install”
- Enter password when prompted (this is your login one, not the security password)
- When install open terminal and type: sudo update-grub
- Reboot (it will reboot in kernel 4.9)
- Reopen Manjaro Settings Manager, click Kernel icon, scroll down, click Uninstall for the 4.9 kernel.
- When uninstalled, open terminal and type: sudo update-grub
When you reboot, the netbook will boot with the newly installed kernel, in this case 4.4.