Can't turn on scroll lock led

[olly1240]

• Sway Version:

1.4

• Debug Log:

https://gist.github.com/olly1240/1a70e2f41101fa83e529057c19a01c97

• Configuration File:

https://gist.github.com/olly1240/8e7856347fef222483b347bbb60ed625

Description

When I try to turn on the scroll lock led by xkb_options neither input * xkb_options grp:sclk_toggle and input * xkb_options grp_led:scrollworks. I tried to assign that to a key but did not work either. If I forcibly turn them on by sudo sh -c "echo 1 > /sys/class/led/input24::scrolllock/brightness" it lights up for a millisecond then turns off. I need to turn this led on because it's tied to my keyboard back-lighting. It shares the power with the scroll lock led.
On tty i can enable and disable it with the echo and with setleds +scroll

[rgouicem]

Same problem here, with sway 1.4.

[BusterGR18]

I'm facing the exact same issue, also tried the echo method with the same result

[Xyene]

It shares the power with the scroll lock led.

That's horrifying...

To be more precise, I believe the behavior is that the backlight turns off after releasing your Enter key -- if you were to keep it pressed, I suspect the backlight would stay on. That's the case with my regular scrolllock LED, anyway.

The relevant logic is actually in wlroots, in particular this bit of code which resends LED states post-key-release. This works marginally better in GNOME/mutter since mutter only updates LEDs when a relevant key is pressed, whereas wlroots does it on every key release. wlroots could perform that logic only when modifiers change as an optimization, but it'd only mask the issue and your backlight would still go off the moment you released CapsLock.

So, I don't think there's much we can do here. That said, here's a relevant libinput thread with more details, with a workaround script you could try.

FWIW, you can also locally patch wlroots to always send the scrolllock bit in the code I linked to work around the issue with your hardware.

[xiliuya]

I made a wlroot patch through the above answers
Operation process link
http://www.gentoo.site/viewtopic.php?id=589

[bigrand]

I made a wlroot patch through the above answers Operation process link http://www.gentoo.site/viewtopic.php?id=589

Based on these workarounds I managed to make a better workaround. I also submitted this issue on wlroots (issue).

[xiliuya]

I made a wlroot patch through the above answers Operation process link http://www.gentoo.site/viewtopic.php?id=589

Based on these workarounds I managed to make a better workaround. I also submitted this issue on wlroots (issue).

This is great. I submitted a merger request to wlroots two weeks ago. merge_requests/3867