Re: Flood of logitech-hidpp-device messages in v6.7

[Hans de Goede]

Hi Oleksandr,

On 1/9/24 12:45, Oleksandr Natalenko wrote:
> Hello Hans et al.
> 
> Starting from v6.7 release I get the following messages repeating in `dmesg` regularly:
> 
> ```
> Jan 09 10:05:06 spock kernel: logitech-hidpp-device 0003:046D:4051.0006: Disconnected
> Jan 09 10:07:15 spock kernel: logitech-hidpp-device 0003:046D:408A.0005: Disconnected
> Jan 09 10:16:51 spock kernel: logitech-hidpp-device 0003:046D:4051.0006: HID++ 4.5 device connected.
> Jan 09 10:16:55 spock kernel: logitech-hidpp-device 0003:046D:408A.0005: HID++ 4.5 device connected.
> Jan 09 10:16:55 spock kernel: logitech-hidpp-device 0003:046D:408A.0005: HID++ 4.5 device connected.
> Jan 09 10:36:31 spock kernel: logitech-hidpp-device 0003:046D:4051.0006: Disconnected
> Jan 09 10:37:07 spock kernel: logitech-hidpp-device 0003:046D:4051.0006: HID++ 4.5 device connected.
> Jan 09 10:46:21 spock kernel: logitech-hidpp-device 0003:046D:4051.0006: Disconnected
> Jan 09 10:48:23 spock kernel: logitech-hidpp-device 0003:046D:408A.0005: Disconnected
> Jan 09 11:12:27 spock kernel: logitech-hidpp-device 0003:046D:4051.0006: HID++ 4.5 device connected.
> Jan 09 11:12:47 spock kernel: logitech-hidpp-device 0003:046D:408A.0005: HID++ 4.5 device connected.
> Jan 09 11:12:47 spock kernel: logitech-hidpp-device 0003:046D:408A.0005: HID++ 4.5 device connected.
> Jan 09 11:38:32 spock kernel: logitech-hidpp-device 0003:046D:4051.0006: Disconnected
> Jan 09 11:43:32 spock kernel: logitech-hidpp-device 0003:046D:408A.0005: Disconnected
> Jan 09 11:45:10 spock kernel: logitech-hidpp-device 0003:046D:4051.0006: HID++ 4.5 device connected.
> Jan 09 11:45:11 spock kernel: logitech-hidpp-device 0003:046D:408A.0005: HID++ 4.5 device connected.
> Jan 09 11:45:11 spock kernel: logitech-hidpp-device 0003:046D:408A.0005: HID++ 4.5 device connected.
> Jan 09 12:31:48 spock kernel: logitech-hidpp-device 0003:046D:4051.0006: Disconnected
> Jan 09 12:33:21 spock kernel: logitech-hidpp-device 0003:046D:4051.0006: HID++ 4.5 device connected.
> ```
> 
> I've got the following hardware:
> 
> * Bus 006 Device 004: ID 046d:c52b Logitech, Inc. Unifying Receiver
> * Logitech MX Keys
> * Logitech M510v2
> 
> With v6.6 I do not get those messages.
> 
> I think this is related to 680ee411a98e ("HID: logitech-hidpp: Fix connect event race").
> 
> My speculation is that some of the devices enter powersaving state after being idle for some time (5 mins?), and then wake up and reconnect once I touch either keyboard or mouse. I should highlight that everything works just fine, it is the flood of messages that worries me.
> 
> Is it expected?

Yes this is expected, looking at your logs I see about 10 messages per
hour which IMHO is not that bad.

I guess we could change things to track we have logged the connect
message once and if yes then log future connect messages (and all
disconnect messages) at debug level.

Jiri, Benjamin, do you have any opinion on this ?

Regards,

Hans