[gentoo-user] some keyboard lag

[gentoo-user] some keyboard lag

[Stefan G. Weichinger]

"interesting" issue on my desktop machine:

when booted with gentoo the keyboard seems to fall "asleep" in a way

It happens repeatedly that the first key pressed does not get detected,
only the second.

For example at login:

login: oot

;)

if I keep typing it keeps working ... and this is *not* in Gnome alone
but on the plain console as well.

The same hardware booted with Fedora: no issues.

Does anyone have an idea about that?

Re: [gentoo-user] some keyboard lag

[Andrew Lowe]

On 06/08/2015 08:01 PM, Stefan G. Weichinger wrote:
> 
> "interesting" issue on my desktop machine:
> 
> when booted with gentoo the keyboard seems to fall "asleep" in a way
> 
> It happens repeatedly that the first key pressed does not get detected,
> only the second.
> 
> For example at login:
> 
> login: oot
> 
> ;)
> 
> if I keep typing it keeps working ... and this is *not* in Gnome alone
> but on the plain console as well.
> 
> The same hardware booted with Fedora: no issues.
> 
> Does anyone have an idea about that?
> 
> 
	Any chance this is a Logitech K520r wireless keyboard? I have one of
these and it at times "goes to sleep" for several seconds. Logitech know
about the problem but refuse to do anything. A google search will reveal
all the gory details. If on the other hand it isn't, sorry, got nothing
to offer.

	Andrew

Re: [gentoo-user] some keyboard lag

[Stefan G. Weichinger]

Am 2015-06-08 um 14:22 schrieb Andrew Lowe:

> 	Any chance this is a Logitech K520r wireless keyboard? I have one of
> these and it at times "goes to sleep" for several seconds. Logitech know
> about the problem but refuse to do anything. A google search will reveal
> all the gory details. If on the other hand it isn't, sorry, got nothing
> to offer.

No, it's wired keyboard by Lenovo: SK-8815

And, by the way, kernel 4.0.5 ... I cross-checked with 4.0.1 and 4.0.4
... same issue (maybe also the same problematic setting somewhere)

thanks, S

[gentoo-user] Re: some keyboard lag

[James]

Stefan G. Weichinger <lists <at> xunil.at> writes:


> "interesting" issue on my desktop machine:
> when booted with gentoo the keyboard seems to fall "asleep" in a way
> 
> It happens repeatedly that the first key pressed does not get detected,
> only the second.

I have always used a "double tap' on the space bar to wake machines.


> if I keep typing it keeps working ... and this is *not* in Gnome alone
> but on the plain console as well.
> The same hardware booted with Fedora: no issues.
> Does anyone have an idea about that?


I can confirm your experience. It seems to be getting worse and I run lxde
for a minimized desktop. I recently have explore ways to manually flush
the cache and memory. It helps, but sometimes I have to reboot the machine.
I am not sure what is at the root of this "deep sleep" on my gentoo machine
either. I suspect the kernel, but it's  only a guess. There is lots to
tune these days, if you have time to read upon things.....


hth,
James

Re: [gentoo-user] some keyboard lag

[Daniel Frey]

On 06/08/2015 05:32 AM, Stefan G. Weichinger wrote:
> Am 2015-06-08 um 14:22 schrieb Andrew Lowe:
> 
>> 	Any chance this is a Logitech K520r wireless keyboard? I have one of
>> these and it at times "goes to sleep" for several seconds. Logitech know
>> about the problem but refuse to do anything. A google search will reveal
>> all the gory details. If on the other hand it isn't, sorry, got nothing
>> to offer.
> 
> No, it's wired keyboard by Lenovo: SK-8815
> 
> And, by the way, kernel 4.0.5 ... I cross-checked with 4.0.1 and 4.0.4
> ... same issue (maybe also the same problematic setting somewhere)
> 
> thanks, S
> 
> 

I would check if USB autosuspend is set for your keyboard, and if it is,
disable it on the keyboard.

Dan

Re: [gentoo-user] some keyboard lag

[Stefan G. Weichinger]

On 08.06.2015 16:44, Daniel Frey wrote:

> I would check if USB autosuspend is set for your keyboard, and if it is,
> disable it on the keyboard.

thanks a lot, that seems to do the trick!

Although I wonder where the difference is:

I compiled a gentoo 4.0.5 kernel based on the config from the fedora
kernel ... and they don't disable USB autosuspend via kernel option as I
do now within my gummiboot entry for gentoo.

Anyway, works for now, thanks again!

Re: [gentoo-user] some keyboard lag

[J. Roeleveld]

On 8 June 2015 19:50:56 CEST, "Stefan G. Weichinger" <lists@xunil.at> wrote:
>On 08.06.2015 16:44, Daniel Frey wrote:
>
>> I would check if USB autosuspend is set for your keyboard, and if it
>is,
>> disable it on the keyboard.
>
>thanks a lot, that seems to do the trick!
>
>Although I wonder where the difference is:
>
>I compiled a gentoo 4.0.5 kernel based on the config from the fedora
>kernel ... and they don't disable USB autosuspend via kernel option as
>I
>do now within my gummiboot entry for gentoo.
>
>Anyway, works for now, thanks again!

There was a similar thread here before about USB and suspend. Check that for specifics if in a hurry. Not at computer now to find the earlier email.

Apart from kernel level USB suspend. There are settings in /sys/.... where you can disable USB suspend on a per-device level.

I would assume Fedora disables that for keyboards and mice (think previous thread was about mice getting forgotten) when detected as such.

--
Joost
-- 
Sent from my Android device with K-9 Mail. Please excuse my brevity.

Re: [gentoo-user] some keyboard lag

[Stefan G. Weichinger]

Am 2015-06-08 um 20:25 schrieb J. Roeleveld:

> There was a similar thread here before about USB and suspend. Check
> that for specifics if in a hurry. Not at computer now to find the
> earlier email.

didn't find it yet .. but no hurry at all.

> Apart from kernel level USB suspend. There are settings in /sys/....
> where you can disable USB suspend on a per-device level.

.. as mentioned in:

https://wiki.gentoo.org/wiki/USB_Power_Saving

?

> I would assume Fedora disables that for keyboards and mice (think
> previous thread was about mice getting forgotten) when detected as
> such.

I browsed their udev rules and found some rules pointing in that
direction but none specifically matching the PCI ID of my keyboard and
the wildcards ... I am not sure.

But they seem to do it specifically, yes ->

# cat /sys/module/usbcore/parameters/autosuspend
2

# my keyboard
# cat /sys/bus/usb/devices/3-1.6/power/control
on

I assume it won't hurt much if I disable USB autosuspend in general for
now? Power savings should be minimal, right? (desktop here, AC etc)

Re: [gentoo-user] some keyboard lag

[Daniel Frey]

On 06/08/2015 11:56 AM, Stefan G. Weichinger wrote:
> I browsed their udev rules and found some rules pointing in that
> direction but none specifically matching the PCI ID of my keyboard and
> the wildcards ... I am not sure.
> 
> But they seem to do it specifically, yes ->
> 
> # cat /sys/module/usbcore/parameters/autosuspend
> 2
> 
> # my keyboard
> # cat /sys/bus/usb/devices/3-1.6/power/control
> on
> 
> I assume it won't hurt much if I disable USB autosuspend in general for
> now? Power savings should be minimal, right? (desktop here, AC etc)
> 

I doubt it'll hurt anything. The power savings bit are more or less all
left to userspace now, and you can toggle something in /sys more than
likely to disable it on the keyboard (as was mentioned already.) It's
probably best to write a udev rule specifically for your keyboard (and
mouse, while you're at it) if you want to go that route.

Dan

Re: [gentoo-user] some keyboard lag

[Bob Wya]

[-- Attachment #1: Type: text/plain, Size: 1342 bytes --]

On Mon, 8 Jun 2015 19:57 Stefan G. Weichinger <lists@xunil.at> wrote:

Am 2015-06-08 um 20:25 schrieb J. Roeleveld:

> There was a similar thread here before about USB and suspend. Check
> that for specifics if in a hurry. Not at computer now to find the
> earlier email.

didn't find it yet .. but no hurry at all.

> Apart from kernel level USB suspend. There are settings in /sys/....
> where you can disable USB suspend on a per-device level.

.. as mentioned in:

https://wiki.gentoo.org/wiki/USB_Power_Saving

?

> I would assume Fedora disables that for keyboards and mice (think
> previous thread was about mice getting forgotten) when detected as
> such.

I browsed their udev rules and found some rules pointing in that
direction but none specifically matching the PCI ID of my keyboard and
the wildcards ... I am not sure.

But they seem to do it specifically, yes ->

# cat /sys/module/usbcore/parameters/autosuspend
2

# my keyboard
# cat /sys/bus/usb/devices/3-1.6/power/control
on

I assume it won't hurt much if I disable USB autosuspend in general for
now? Power savings should be minimal, right? (desktop here, AC etc)


Doesn't the powertop utility have a facility to do this per-device and to
see what the current power-save settings are per-device? Surely a bit
easier to use than directly messing about with udev rules?

[-- Attachment #2: Type: text/html, Size: 1870 bytes --]

Re: [gentoo-user] some keyboard lag

[J. Roeleveld]

On Monday, June 08, 2015 08:56:13 PM Stefan G. Weichinger wrote:
> Am 2015-06-08 um 20:25 schrieb J. Roeleveld:
> > There was a similar thread here before about USB and suspend. Check
> > that for specifics if in a hurry. Not at computer now to find the
> > earlier email.
> 
> didn't find it yet .. but no hurry at all.
> 
> > Apart from kernel level USB suspend. There are settings in /sys/....
> > where you can disable USB suspend on a per-device level.
> 
> .. as mentioned in:
> 
> https://wiki.gentoo.org/wiki/USB_Power_Saving
> 
> ?

Yes, similar to this.
You want to find out how to identify USBHID devices and disable it for those.

On my laptop (only a USB mouse):
/sys/bus/usb/devices/1-6:1.0/driver -> 
../../../../../../bus/usb/drivers/usbhid

--
Joost