[Feature request]: Backlight turns off after two minutes

[umutd3401]

Describe the bug

I want to keep the backlight on 30 minutes while idle, but after 2 minutes the backlight turns off. I changed 'disable_due_inactivity_time' but doesn't work. It turns back on when I touch anywhere on the touchpad and turns off again after two minutes.

Expected behavior

Not turning off after two minutes.

Relevant log output

No response

Desktop

• Program version master
• Distro Fedora 38
• Kernel 6.4.15-200.fc38.x86_64

[ldrahnik]

@umutd3401 Hello, thank you for creating this issue. I know about this. The reason why this happens: is prioritized touchpad device's power control. As solution for your problem should be enough to change the value for example inside autosuspend_delay_ms of your touchpad device if possible or value of control from auto. I could in this driver increase this value (I mean autosuspend_delay_ms) but it looks like it is not possible.

$ cat autosuspend_delay_ms
cat: autosuspend_delay_ms: Input/output error

I will try look at this one more time. Also, please let me know what you think.

[ldrahnik]

@umutd3401 Look at touchpad power management issue

[umutd3401]

Thank you for your help. I tried to change autosuspend_delay_ms and then control but it didn't work. I even turned everything from powertop in case I couldn't find the right one and also tried a different distro.

I don't know much about these stuff but do you think a touchpad input can be emulated to prevent suspend? For example, when I touch the edge of the touchpad, evtest detects event but nothing happens because it is an edge. I don't know if this will work or prevent suspend.

Edit: Didn't work. Even when not sending events, it doesn't suspend when I swipe the touchpad. I think it's hardware related.

[ldrahnik]

@umutd3401 Unfortunately what I have done up to this moment is an only attempt for my i2c (found during running

$ sudo ./install.sh
...
Testing interface i2c-1 : failed
Testing interface i2c-2 : sucess
... 

)

to change appropriate file /sys/bus/i2c/devices/i2c-2/device/power/autosuspend_delay_ms / /sys/bus/i2c/devices/i2c-2/device/power/control

and also for the found device via file /proc/bus/input/devices.

/sys/devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-2/i2c-ASUE140D:00/0018:04F3:31B9.0002/input/input30/power

but it looks like that touchpad is suspended every time after almost 2 mins.

I will try to continue later.

[umutd3401]

I just installed Windows 11 to see if it's the same and yes, it has the same behavior, so I don't think there is a solution. I will contact ASUS but have no hope.