Keyboard issue with kernel 4.15.5 (possible Arch issue?)

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Keyboard issue with kernel 4.15.5 (possible Arch issue?)

arch general mailing list-2
Hey hey,
I updated yesterday, from some;thing like a 4.13 or 4.14 kernel to version
4.15.5 and couldn't use my PS/2 keyboard. I saw the LEDs flashing when the
system started, but couldn't get any response from the keyboard upon login.
I've managed to get the system going with a USB keyboard.

My PS/2 keyboard is rather old. Is it more likely that the keyboard is broken,
or is there a chance of a kernel configuration breaking usage of the PS/2
keyboard?

Best wishes,

Jeanette

--------
  * Website: http://juliencoder.de - for summer is a state of sound
  * SoundCloud: https://soundcloud.com/jeanette_c
  * GitHub: https://github.com/fsilvain
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All I need is time
A moment that is mine
While I'm in between <3
(Britney Spears)
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Re: Keyboard issue with kernel 4.15.5 (possible Arch issue?)

arch general mailing list-2
On 3/13/18, Jeanette C. via arch-general <[hidden email]> wrote:

> Hey hey,
> I updated yesterday, from some;thing like a 4.13 or 4.14 kernel to version
> 4.15.5 and couldn't use my PS/2 keyboard. I saw the LEDs flashing when the
> system started, but couldn't get any response from the keyboard upon login.
>
> I've managed to get the system going with a USB keyboard.
>
> My PS/2 keyboard is rather old. Is it more likely that the keyboard is
> broken, or is there a chance of a kernel configuration breaking usage of
> the PS/2 keyboard?

Does the keyboard function in BIOS?

Does it work if boot another distro's live usb or cd?

You said 4.13/4.14 before so I don't think you're affected by the
initramfs changes in 2014:

https://www.archlinux.org/news/linux-313-warning-ps2-keyboard-support-is-now-modular/
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Re: Keyboard issue with kernel 4.15.5 (possible Arch issue?)

arch general mailing list-2
Mar 13 2018, Carsten Mattner has written:
...
> Does the keyboard function in BIOS?
Can't tell, I'm blind and there's no screen connected anyway. Don't have
one anymore.
>
> Does it work if boot another distro's live usb or cd?
Hm, I should really try that. Thanks for the hint.
>
> You said 4.13/4.14 before so I don't think you're affected by the
> initramfs changes in 2014:
>
> https://www.archlinux.org/news/linux-313-warning-ps2-keyboard-support-is-now-modular/
Shouldn't be.
...

Best wishes and thanks,

Jeanette

--------
  * Website: http://juliencoder.de - for summer is a state of sound
  * SoundCloud: https://soundcloud.com/jeanette_c
  * GitHub: https://github.com/fsilvain
  * Twitter: https://twitter.com/ffanci_silvain

All I need is time
A moment that is mine
While I'm in between <3
(Britney Spears)
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Re: Keyboard issue with kernel 4.15.5 (possible Arch issue?)

Ralf Mardorf-4
In reply to this post by arch general mailing list-2
As a real-time audio user, too, be sure, I'm as well using a PS/2
keyboard. A PS/2 keyboard should work. However, from time to time it
could happen, that the keyboard's lock LEDs start blinking during
startup and startup doesn't finish, but the messages don't show a
kernel panic or something keyboard related. If this happens, I just
need to reset the computer, a second startup always worked for me.
assuming your keyboard should be broken, they still sell brand new
native PS/2 keyboards in all price ranges. Due to the USB keyboard
issues PS/2 keyboards are seemingly much more important to gamers, than
for real-time audio users.

Btw. "core" provides 4.15.8. I already upgraded to 4.15.8 early Monday
morning and FWIW I skipped 4.15.5 and upgraded from 4.15.4-1 to
4.15.6-1, so I don't know if something is fishy with 4.15.5.

pacman -Q linux{,-rt{,-securityink,-pussytoes,-cornflower}}|cut -d\  -f2
4.15.8-1
4.14.24_rt19-1
4.14.20_rt17-1
4.14.8_rt9-2
4.11.12_rt16-1
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Re: Keyboard issue with kernel 4.15.5 (possible Arch issue?)

arch general mailing list-2
On 3/14/18, Ralf Mardorf <[hidden email]> wrote:
> As a real-time audio user, too, be sure, I'm as well using a PS/2
> keyboard. A PS/2 keyboard should work. However, from time to time it

I'm so glad to hear there are other PS/2 keyboard proponents.

USB kinda, sorta works but the bus nature of it, and having
more than two devices connected, it means there's intermittent
bus resets and ports disabled by kernel until reboot if it's
those kind of days.

> could happen, that the keyboard's lock LEDs start blinking during
> startup and startup doesn't finish, but the messages don't show a
> kernel panic or something keyboard related. If this happens, I just
> need to reset the computer, a second startup always worked for me.
> assuming your keyboard should be broken, they still sell brand new
> native PS/2 keyboards in all price ranges. Due to the USB keyboard
> issues PS/2 keyboards are seemingly much more important to gamers, than
> for real-time audio users.

Is it still native when connected with a USB-to-PS/2 adapter?

I'm asking because it's very limiting when you shop around
for a keyboard with a "pure" PS/2 connector. It's already hard
to find an ergonomic keyboard that has mechanical switches,
and insisting on non-USB shrinks the list, leaving not much
of a selection.

> Btw. "core" provides 4.15.8. I already upgraded to 4.15.8 early Monday
> morning and FWIW I skipped 4.15.5 and upgraded from 4.15.4-1 to
> 4.15.6-1, so I don't know if something is fishy with 4.15.5.

What was wrong with 4.15.5? I missed the news.
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Re: Keyboard issue with kernel 4.15.5 (possible Arch issue?)

Ralf Mardorf-4
On Wed, 14 Mar 2018 06:48:04 +0000, Carsten Mattner wrote:
>Is it still native when connected with a USB-to-PS/2 adapter?

I don't know, I even don't know what is true and what are untrue myths
about PS/2 vs USB keyboards. However, since I have the choice to use
PS/2 keyboards with the keys I like, for the same ammount of money as
USB keyboards do cost, I don't want to test USB keyboards, even if they
provide the same kind of keys.

The myth important to me is, that if I don't touch the keyboard using a
PS/2 keyboard, it doesn't actively communicate with the computer, while
the myth claims, that USB does enforce communication between keyboard
and computer from time to time, even if you don't type, which might
be an issue for real-time audio users.

A myth unimportant to me is the way keystrokes are handled/registered,
by an USB keyboard probaply just a limited amont of keys could be
pushed at the same time and/or there is more latency and/or if you type
fast, the keyboard might not keep up, which seems to be important for
gamers or people who type really fast.

There are also some myth regarding security for some kinds of usages.

In short, as long as you could get a "native" PS/2 keyboard with the
kinds of keys you like, for an ammount of money that is ok, I wouldn't
risk to buy an USB keyboard.
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Re: Keyboard issue with kernel 4.15.5 (possible Arch issue?)

arch general mailing list-2
On Wed, Mar 14, 2018 at 4:25 AM, Ralf Mardorf <[hidden email]> wrote:

> On Wed, 14 Mar 2018 06:48:04 +0000, Carsten Mattner wrote:
>>Is it still native when connected with a USB-to-PS/2 adapter?
>
> I don't know, I even don't know what is true and what are untrue myths
> about PS/2 vs USB keyboards. However, since I have the choice to use
> PS/2 keyboards with the keys I like, for the same ammount of money as
> USB keyboards do cost, I don't want to test USB keyboards, even if they
> provide the same kind of keys.
>
> The myth important to me is, that if I don't touch the keyboard using a
> PS/2 keyboard, it doesn't actively communicate with the computer, while
> the myth claims, that USB does enforce communication between keyboard
> and computer from time to time, even if you don't type, which might
> be an issue for real-time audio users.
>
> A myth unimportant to me is the way keystrokes are handled/registered,
> by an USB keyboard probaply just a limited amont of keys could be
> pushed at the same time and/or there is more latency and/or if you type
> fast, the keyboard might not keep up, which seems to be important for
> gamers or people who type really fast.
>
> There are also some myth regarding security for some kinds of usages.
>
> In short, as long as you could get a "native" PS/2 keyboard with the
> kinds of keys you like, for an ammount of money that is ok, I wouldn't
> risk to buy an USB keyboard.

BTW, in some cases, in desktop machines, at boot time, you can find
yourself with a BIOS that doesn't take USB keyboards by default (or at
all), and then you're pretty much done...
Sometimes you can set the BIOS for USB keyboards, but only with a PS/2
in advance.
I always prefer PS/2 keyboards. There're various reasons.