T495 brightness

fernandel · Nov 10, 2023

Hi!

I am using accessibility/gammy for brightness in my T495.
I like to use FN keys but I am not successful.

In /boot/loader.conf I have:

Code:

acpi_ibm_load="YES"
acpi_call_load="YES"
acpi_video_load="YES"

sysctl -a | grep bright grep shows:
{code]hw.acpi.video.lcd0.brightness: 60
dev.acpi_ibm.0.lcd_brightness: 0 [/code]

With key FN = brightness -/+ it works but screen brightness doesn't change:

Code:

cat /var/run/devd.pipe
!system=ACPI subsystem=IBM type=\_SB_.PCI0.LPC0.EC0_.HKEY notify=0x11
!system=ACPI subsystem=Video type=brightness notify=55
!system=ACPI subsystem=IBM type=\_SB_.PCI0.LPC0.EC0_.HKEY notify=0x11
!system=ACPI subsystem=Video type=brightness notify=50

Thank you.

elgrande · Nov 11, 2023

When you manually change the brightness sysctl's, does display brightness change?

dr3mro · Nov 11, 2023

Does issueing this command does something

$ backlight 30

Aminavy · Nov 11, 2023

acpi_video should be loaded after any of the DRM kernel modules.

fernandel · Nov 11, 2023

elgrande said:
When you manually change the brightness sysctl's, does display brightness change?

no

fernandel · Nov 11, 2023

dr3mro said:
Does issueing this command does something

$ backlight 30

yes, it changed the brightnes

fernandel · Nov 11, 2023

Aminavy said:
acpi_video should be loaded after any of the DRM kernel modules.

where should I put acpi_video than, please?

Minbari · Nov 11, 2023

fernandel said:
where should I put acpi_video than, please?

In /etc/rc.conf so that you have a "fast" boot and also to allow system to load them in parallel rather than sequential.
E.g.:

Code:

kld_list="${kld_list} i915kms acpi_dock acpi_ibm acpi_video"
kld_list="${kld_list} fusefs coretemp sem cpuctl ichsmb cuse"

dr3mro · Nov 11, 2023

fernandel said:
yes, it changed the brightnes

consider this blog post, it might help you

Adjusting acpi_video brightness increments on FreeBSD

Replicate the behaviour of intel-backlight in acpi_video on FreeBSD by customizing the brightness adjustment increments.

www.davidschlachter.com

fernandel · Nov 11, 2023

Maybe is the problem because my system has amd processor and amd graphics card?

dr3mro · Nov 11, 2023

fernandel said:
Maybe is the problem because my system has amd processor and amd graphics card?

try to peek devd pipe and assign a rule to execute backlight accordingly.

fernandel · Nov 11, 2023

I have in /var/log/messages some errors related to acpi_ec0 (when computer boot). One of the is
"acpi_ec0 no hardware response errors" and as I remeber it wa 2021 when I report a bug in acpi mailing list. The answer was if I want to rid of the put in sysctl.conf debug.acpi.ec.burst=1.

Thank you to help me.