I am working now for 3 weeks at following problem. I wanted to install Ubuntu 14.04 on a new ASUS UEFI PC. Here was my first problem description with a question, but nobody answered:
Meantime I installed Ubuntu14.04(same problems with 12.04) with bootoption: acpi=noirq for installation. After Installation I wanted to run it with the same bootoption, which is not as bad as acpi=off. But after installatoin its not possible to run without: acpi=off.
If not booting with acpi=off following lines spam my syslog and kern.log until the disk is full(50GB in 1 hour). Very bad for SSD...
ACPI Exception: AE_NOT_FOUND, while evaluating GPE method [_L06] (20140926/evgpe-581) ACPI Error: [\_SB_.PCI0.GFX0.GSSE] Namespace lookup failure, AE_NOT_FOUND (20140926/psargs-559) ACPI Error: Method parse/execution failed [\_GPE._L06] (Node ffff392a2f003), AE_NOT_FOUND (20140926/psparse-536)
In the meantime I read a lot about irq, acpi and dsdt tables. First I thougth, there is a problem with bad implementation of ACPI and DSDT Tables from ASUS and namespace ae_not_found is missing in the dsdt table.
But now I understood the problem: There is no DSDT Table and other ACPi Tables?! Under /sys/firmware/acpi there is nothing?!
Ok, so Linux cant access the tables and so there is the namespace missing error in table, bacause indeed there is no table and no namespace...
Now I want to know how to get the tables there? Is it possible to extract it from the UEFi and insert it there? What can I do?!
Perhaps will it help to install Ubuntu in legacy(BIOS) and not in UEFI mode?! I would have to reinstall so windows, too.
I am getting sick of this error. I used Ubuntu for 2 years, but I am searching now for 3 weeks for that error. I am close to delete ubuntu and get back to clear windows...
Update: To make more clear. I decompiled the ACPI Tables and found only entries for Windows. Seems that BIOS/UEFI ACPI interface is wrong implementated into it. I have already installed the latest BIOS. Any othter ideas?!