[Bug 219890] illuminance sensor is jittering between correct value and 0.03lux

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=219890

--- Comment #2 from wysiwyg81@rbox.co ---
Hello, Did you mean in /sys/bus/iio/devices/ instead of 
/sys/iio/devices/ if so: /sys/bus/iio/devices ❯ ls -lh Permissions Size 
User Date Modified Name lrwxrwxrwx - root 17 mars 13:43  iio:device0 -> 
../../../devices/pci0000:00/0000:00:14.0/usb3/3-8/3-8:1.0/0003:17EF:F006.000E/HID-SENSOR-200041.6.auto/iio:device0 
lrwxrwxrwx - root 17 mars 13:43  iio:device1 -> 
../../../devices/pci0000:00/0000:00:14.0/usb3/3-8/3-8:1.0/0003:17EF:F006.000E/HID-SENSOR-200041.7.auto/iio:device1 
lrwxrwxrwx - root 17 mars 13:43  trigger0 -> 
../../../devices/pci0000:00/0000:00:14.0/usb3/3-8/3-8:1.0/0003:17EF:F006.000E/HID-SENSOR-200041.6.auto/trigger0 
lrwxrwxrwx - root 17 mars 13:43  trigger1 -> 
../../../devices/pci0000:00/0000:00:14.0/usb3/3-8/3-8:1.0/0003:17EF:F006.000E/HID-SENSOR-200041.7.auto/trigger1

(bugzilla seems down currently, so I try direct email answer, hope it 
works, I will check once bugzilla is back).

Best regards,

On 17/03/2025 13:15, bugzilla-daemon@kernel.org wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=219890
>
> --- Comment #1 from Jonathan Cameron (jic23@kernel.org) ---
> On Mon, 17 Mar 2025 09:38:50 +0000
> bugzilla-daemon@kernel.org wrote:
>
>> https://bugzilla.kernel.org/show_bug.cgi?id=219890
>>
>>              Bug ID: 219890
>>             Summary: illuminance sensor is jittering between correct value
>>                      and 0.03lux
>>             Product: Drivers
>>             Version: 2.5
>>            Hardware: All
>>                  OS: Linux
>>              Status: NEW
>>            Severity: normal
>>            Priority: P3
>>           Component: IIO
>>            Assignee: drivers_iio@kernel-bugs.kernel.org
>>            Reporter: wysiwyg81@rbox.co
>>          Regression: No
>>
>> Hello,
>>
>> I have a Lenovo thinkbook 13x gen4.
>> Automatic brightness control is flickering in Gnome, so I checked sensor
>> with
>> monitor-sensor command (iio-sensor-proxy).
>>
>> it shows following behavior:
>> monitor-sensor  --light
>>      Waiting for iio-sensor-proxy to appear
>> +++ iio-sensor-proxy appeared
>> === Has ambient light sensor (value: 316,000000, unit: lux)
>>      Light changed: 299,000000 (lux)
>>      Light changed: 0,030000 (lux)
>>      Light changed: 299,000000 (lux)
>>      Light changed: 0,030000 (lux)
>>      Light changed: 299,000000 (lux)
>>      Light changed: 0,030000 (lux)
>>      Light changed: 305,000000 (lux)
>>
>>
>> the 0.03 is unexpected has it has never been that dark.
>> it seems it's not a iio-sensor-proxy bug as I can see similar behavior by
>> checking directly content of here :
>> /sys/bus/iio/devices/iio:device0/in_illuminance_raw
>>
>>
>> I checked the behavior on windows to make sure it's not an hardware failure
>> from my sensor.
>> While I cannot have direct access to raw sensor data on windows, the
>> automatic
>> brightness is perfectly smooth: no flickering of any kind.
>>
>> I didn't found sensor name:
>> ❯ cat  /sys/bus/iio/devices/iio:device0/name
>> als
> Two possibles types. It's either a hid sensor or an ACPI class interface
> with a sensor wrapped up in firmware.
>
> My guess is hid-sensor.  Can you do an
> ls -lh in /sys/iio/devices/
> so we can see what the parent is.
> +CC Srinivas based on playing guess the sensor.
>
> Jonathan
>
>
>
>
>
>> But if there is other place I could look, let me know.
>>

-- 
You may reply to this email to add a comment.

You are receiving this mail because:
You are watching the assignee of the bug.