Re: "EC: Install address space handler at the namespace root" causing issues for some users

[Hans de Goede <hdegoede@redhat.com>]

Hi,

On 7/29/24 1:15 PM, Hans de Goede wrote:
> Hi Rafael,
> 
> There are 2 bug reports:
> 
> 1. Brightness up/down key-presses no longer working on LG laptop (acpi-video related):
> https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org/thread/V2KWAGZIAX4TOWPCH6A6FSIT66PR3KMZ/
> 
> 2. EC related ACPI errors and bad performance:
> https://bugzilla.redhat.com/show_bug.cgi?id=2298938
> 
> Both of which started with 6.9.7 which has the 2 commits related to "EC: Install
> address space handler at the namespace root" from 6.10 backported:
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/drivers/acpi?h=v6.9.7&id=2b2b0ac1533d790690d6d28899f01a2924d54d4d
> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/drivers/acpi?h=v6.9.7&id=9750135f2f326879889ed60ccd68b96572dfa6ee
> 
> i have build a test 6.9.9 kernel with these 2 reverted and 1. is confirmed to be fixed
> by reverting these 2 commits. Although the user does report an IRQ storm on the ACPI IRQ
> (IRQ 9) related to thunderbolt after this.
> 
> I have not yet got confirmation that the second bug is also resolved by the commits.

... resolved by *reverting* the commits.

> Either way it looks like we need to dig into this and figure out what is causing
> these EC related regressions.

I'm wondering if maybe this is also somewhat related to commit e2ffcda16290 ("ACPI: OSL:
Allow Notify () handlers to run on all CPUs") ?

I guess not though since this started in 6.9.7 and 6.9.6 is fine.

I did recently submit an unrelated fix caused by e2ffcda16290:

https://lore.kernel.org/platform-driver-x86/20240729110030.8016-1-hdegoede@redhat.com/

Regards,

Hans