Re: Screen brightness keys not working

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Hi,

On 7/29/24 1:23 PM, Hans de Goede wrote:
> Hi,
> 
> On 7/22/24 5:35 PM, Iñaki Ucar wrote:
>>
>> On Mon, 22 Jul 2024 at 17:22, Iñaki Ucar <iucar@xxxxxxxxxxxxxxxxx <mailto:iucar@xxxxxxxxxxxxxxxxx>> wrote:
>>
>>     Hi Hans,
>>
>>     On Thu, 18 Jul 2024 at 11:28, Hans de Goede <hdegoede@xxxxxxxxxx <mailto:hdegoede@xxxxxxxxxx>> wrote:
>>
>>         Hi,
>>
>>         On 7/16/24 5:59 PM, Iñaki Ucar wrote:
>>         >
>>         >
>>         > On Tue, 16 Jul 2024 at 12:29, Hans de Goede <hdegoede@xxxxxxxxxx <mailto:hdegoede@xxxxxxxxxx> <mailto:hdegoede@xxxxxxxxxx <mailto:hdegoede@xxxxxxxxxx>>> wrote:
>>         >
>>         >     Hi,
>>         >
>>         >     On 7/15/24 9:50 PM, Iñaki Ucar wrote:
>>         >     > It's the kernel. Going back to 6.9.6 fixes the issue...
>>         >
>>         >     Ok, that is a good first step in debugging this.
>>         >
>>         >     Can you run evtest with the working kernel and then check which
>>         >     event node is generating key-presses for the brightness keys,
>>         >     that should help narrow it down further.
>>         >
>>         >     Likely candidates are: "LG WMI hotkeys",
>>         >     "AT translated set 2 keyboard", "Video Bus".
>>         >
>>         >
>>         > In "Video Bus", there are KEY_BRIGHTNESSDOWN and KEY_BRIGHTNESSUP that are triggered.
>>
>>         Ok, then this likely is not an issue with the lg-laptop driver but rather with
>>         the ACPI subsystem.
>>
>>         Likely culprit commits which are new in 6.9.7 are:
>>
>>         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=2b2b0ac1533d790690d6d28899f01a2924d54d4d>
>>         https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/drivers/acpi?h=v6.9.7&id=9750135f2f326879889ed60ccd68b96572dfa6ee <https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/drivers/acpi?h=v6.9.7&id=9750135f2f326879889ed60ccd68b96572dfa6ee>
>>
>>
>>         Or maybe:
>>
>>         https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/drivers/acpi?h=v6.9.7&id=e21a4c9129c72fa54dd00f5ebf71219b41d43c04 <https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/drivers/acpi?h=v6.9.7&id=e21a4c9129c72fa54dd00f5ebf71219b41d43c04>
>>
>>         But I suspect it is one of the above 2.
>>
>>         I have started a 6.9.9 test-build with those 2 patches reverted:
>>
>>         https://koji.fedoraproject.org/koji/taskinfo?taskID=120674294 <https://koji.fedoraproject.org/koji/taskinfo?taskID=120674294>
>>
>>
>>     Good catch! I confirm that the build above does not have the issues I was experiencing.
> 
> Thank you  I have reported this issue to the ACPI maintainer now:
> 
> https://lore.kernel.org/linux-acpi/1f76b7e2-1928-4598-8037-28a1785c2d13@xxxxxxxxxx/
> 
> 
>> However, with this I have another issue:  when I connect my laptop to my Thunderbolt dock, I see irq/9-acpi constantly spinning the CPU at 40%. :( I had to go back to the previous one.
> 
> Ok, that is unfortunate. Can you try powering off the lapto and then directly booting into the test kernel,
> without first booting a bad kernel?  I'm wondering if the bad kernel maybe confuses the EC in such a way
> that it is still unhappy after a reboot.

Also can you please file a bug for this here:

https://bugzilla.kernel.org/enter_bug.cgi?product=ACPI

(creating an account only requires an email address + your name, no other info is requires).

As ACPI sub component please select "EC".

and then please run:

sudo dnf install acpica-tools
sudo acpidump > acpidump.txt

And attach the generated acpidump.txt file to the bug
you have created at: https://bugzilla.kernel.org/

This gives us access to a copy of the ACPI tables of your
laptop which will hopefully help with debugging this further.

Regards,

Hans


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