Arch Linux

klios

Member

Registered: 2012-03-17

Posts: 22

[SOLVED] Fn Keys slow reaction / delay

Hi guys. I'm having problems with arch on my laptop. The last time I installed arch on this laptop (+7 months) it work right out of the box. But now, the fn keys have a delay response. Example when I press on XF86MonBrightnessDown, works ok, if I do it again, it has some delay, if I press it again, it has more delay. All fn keys I tried except Volume change keys all do the same thing.

I tried using Ubuntu 15 live cd, and it does not have this problem, the fn keys works fine. I also try Solus Project live cd, and they have delay as Arch has. Im suspecting it maybe the kernel. (Ubuntu kernel version is 3.19, Arch and Solus is 4.1.

Sorry for my english.
Thanks.

Last edited by klios (2015-08-02 01:33:26)

ewaller

Administrator

From: Pasadena, CA

Registered: 2009-07-13

Posts: 19,778

Re: [SOLVED] Fn Keys slow reaction / delay

Intel graphics?
How many entries exist under /sys/class/backlight? One for intel, one for acpi?

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klios

Member

Registered: 2012-03-17

Posts: 22

Re: [SOLVED] Fn Keys slow reaction / delay

Intel graphics?
How many entries exist under /sys/class/backlight? One for intel, one for acpi?

Hey. Thanks for the quick reply. I have intel graphics and there is only one entry under /sys/class/backlight, just intel_backlight.

Thanks.

ewaller

Administrator

From: Pasadena, CA

Registered: 2009-07-13

Posts: 19,778

Re: [SOLVED] Fn Keys slow reaction / delay

Thats too bad.  Had there been two, I'd have told you to add a kernel command line option that limited it to the intel_backlight

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Nothing is too wonderful to be true, if it be consistent with the laws of nature -- Michael Faraday
Sometimes it is the people no one can imagine anything of who do the things no one can imagine. -- Alan Turing
---
How to Ask Questions the Smart Way

klios

Member

Registered: 2012-03-17

Posts: 22

Re: [SOLVED] Fn Keys slow reaction / delay

Thats one of the first things I checked before posting here. Im thinking maybe its a Kernel issue. Really dont know, Ill wait for other replies. Thanks.

klios

Member

Registered: 2012-03-17

Posts: 22

Re: [SOLVED] Fn Keys slow reaction / delay

Edit: If I exec xbacklight -inc or -dec it works fine. Just delay when I used fn keys.

Head_on_a_Stick

Member

From: London

Registered: 2014-02-20

Posts: 7,732

Website

Re: [SOLVED] Fn Keys slow reaction / delay

Im suspecting it maybe the kernel. (Ubuntu kernel version is 3.19, Arch and Solus is 4.1.

Have you tried the LTS kernel?

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klios

Member

Registered: 2012-03-17

Posts: 22

Re: [SOLVED] Fn Keys slow reaction / delay

Im suspecting it maybe the kernel. (Ubuntu kernel version is 3.19, Arch and Solus is 4.1.

Have you tried the LTS kernel?

No, I did not. Im on 4.1. If I install this do I have to do something after?

Head_on_a_Stick

Member

From: London

Registered: 2014-02-20

Posts: 7,732

Website

Re: [SOLVED] Fn Keys slow reaction / delay

If I install this do I have to do something after?

Reconfigure your boot{loader,manager}

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klios

Member

Registered: 2012-03-17

Posts: 22

Re: [SOLVED] Fn Keys slow reaction / delay

If I install this do I have to do something after?

Reconfigure your boot{loader,manager}

Thanks. I installed arch-lts and now it work just fine. How can I report the bug?

Head_on_a_Stick

Member

From: London

Registered: 2014-02-20

Posts: 7,732

Website

Re: [SOLVED] Fn Keys slow reaction / delay

How can I report the bug?

https://wiki.archlinux.org/index.php/Re … guidelines

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Ph1r3ph0x

Member

Registered: 2014-02-22

Posts: 4

Re: [SOLVED] Fn Keys slow reaction / delay

Hey I actually had the same issue and only one entry in /sys/class/backlight etc.
It took me a while to figure out but it was caused by "virtualbox-guest-dkms". After I removed it everything went back to normal
Maybe this helps somebody.

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 21,678

Re: [SOLVED] Fn Keys slow reaction / delay

Thanks for sharing, however it is unclear whether that was really involved in the OPs issue and whether your solution  really is relevant to the problem 2 years later.

Please don't necro bump.

Closing.

Last edited by V1del (2017-12-15 17:04:59)