Van egy ipari jelfogós dobozka az irodai gépem USB portjára dugva.
Ilyen üzenetek jönnek néha:

Jan 18 10:03:16 myhost kernel: [1522561.330399] hub 2-0:1.0: port 2 disabled by 
hub (EMI?), re-enabling...
Jan 18 10:03:16 myhost kernel: [1522561.330408] usb 2-2: USB disconnect, 
address 23
Jan 18 10:03:17 myhost kernel: [1522561.565383] usb 2-2: new full speed USB 
device using uhci_hcd and address 24
Jan 18 10:03:17 myhost kernel: [1522561.727230] usb 2-2: configuration #1 
chosen from 1 choice
Jan 18 10:03:17 myhost kernel: [1522561.737725] usb 2-2: New USB device found, 
idVendor=1809, idProduct=4761
Jan 18 10:03:17 myhost kernel: [1522561.737736] usb 2-2: New USB device 
strings: Mfr=4, Product=92, SerialNumber=0
Jan 18 10:03:17 myhost kernel: [1522561.737741] usb 2-2: Product: USB4761 DA&C 
Device(FS) BoardID=00
Jan 18 10:03:17 myhost kernel: [1522561.737746] usb 2-2: Manufacturer: 
Advantech Co., Ltd. (www.advantech.com.tw)
Jan 18 10:43:31 myhost kernel: [1525516.714808] hub 2-0:1.0: port 2 disabled by 
hub (EMI?), re-enabling...
Jan 18 10:43:31 myhost kernel: [1525516.714818] usb 2-2: USB disconnect, 
address 24
Jan 18 10:43:31 myhost kernel: [1525516.854055] usb 2-2: new full speed USB 
device using uhci_hcd and address 25
Jan 18 10:43:31 myhost kernel: [1525517.070043] usb 2-2: configuration #1 
chosen from 1 choice
Jan 18 10:43:31 myhost kernel: [1525517.070043] usb 2-2: New USB device found, 
idVendor=1809, idProduct=4761
Jan 18 10:43:31 myhost kernel: [1525517.070043] usb 2-2: New USB device 
strings: Mfr=4, Product=92, SerialNumber=0
Jan 18 10:43:31 myhost kernel: [1525517.070043] usb 2-2: Product: USB4761 DA&C 
Device(FS) BoardID=00
Jan 18 10:43:31 myhost kernel: [1525517.070043] usb 2-2: Manufacturer: 
Advantech Co., Ltd. (www.advantech.com.tw)
Jan 18 11:01:09 myhost kernel: [1526831.710278] hub 2-0:1.0: port 2 disabled by 
hub (EMI?), re-enabling...
Jan 18 11:01:09 myhost kernel: [1526831.710288] usb 2-2: USB disconnect, 
address 25
Jan 18 11:01:09 myhost kernel: [1526831.845185] usb 2-2: new full speed USB 
device using uhci_hcd and address 26
Jan 18 11:01:09 myhost kernel: [1526832.015251] usb 2-2: configuration #1 
chosen from 1 choice
Jan 18 11:01:09 myhost kernel: [1526832.031252] usb 2-2: New USB device found, 
idVendor=1809, idProduct=4761
Jan 18 11:01:09 myhost kernel: [1526832.031252] usb 2-2: New USB device 
strings: Mfr=4, Product=92, SerialNumber=0
Jan 18 11:01:09 myhost kernel: [1526832.031252] usb 2-2: Product: USB4761 DA&C 
Device(FS) BoardID=00
Jan 18 11:01:09 myhost kernel: [1526832.031252] usb 2-2: Manufacturer: 
Advantech Co., Ltd. (www.advantech.com.tw)


Azaz az USB hub úgy érzi, hogy megszakadt, majd újra helyreállt a kapcsolat.
Most külön megmutatom a dátumokat pár napra visszamenõleg:

Jan 11 08:53:59
Jan 11 09:09:53
Jan 11 09:09:53
Jan 11 10:42:02
Jan 11 11:06:33
Jan 11 11:06:36
Jan 11 11:09:27
Jan 11 11:13:54
Jan 11 12:45:13
Jan 11 12:45:14
Jan 11 14:06:31
Jan 11 14:07:24
Jan 11 14:07:25
Jan 11 14:07:26
Jan 11 14:07:29
Jan 11 14:07:54
Jan 11 14:58:58
Jan 11 14:59:13
Jan 11 16:55:43
Jan 11 16:55:44
Jan 11 17:21:58
Jan 11 17:56:34
Jan 11 17:56:44
Jan 11 17:56:49
Jan 12 09:21:02
Jan 12 09:34:18
Jan 12 10:47:52
Jan 12 10:47:52
Jan 12 11:26:22
Jan 12 11:41:46
Jan 12 12:12:35
Jan 12 12:12:36
Jan 12 12:19:31
Jan 12 12:19:32
Jan 12 14:47:30
Jan 12 15:54:19
Jan 12 16:00:39
Jan 12 16:00:51
Jan 12 16:48:53
Jan 12 16:51:35
Jan 13 10:25:32
Jan 13 10:28:11
Jan 13 10:44:52
Jan 13 10:48:11
Jan 13 11:40:14
Jan 13 12:44:25
Jan 13 14:11:03
Jan 13 15:03:43
Jan 13 15:03:43
Jan 13 17:01:55
Jan 13 17:07:18
Jan 13 17:28:06
Jan 13 17:30:26
Jan 13 17:31:18
Jan 13 17:31:44
Jan 13 17:38:14
Jan 13 17:38:16
Jan 13 17:39:14
Jan 13 17:39:14
Jan 13 17:43:40
Jan 14 09:00:00
Jan 14 09:29:28
Jan 14 09:29:57
Jan 14 09:59:41
Jan 14 10:00:46
Jan 14 10:17:01
Jan 14 10:20:11
Jan 14 12:08:28
Jan 14 12:22:53
Jan 14 12:49:20
Jan 14 12:50:28
Jan 14 13:10:07
Jan 14 15:41:18
Jan 14 15:53:55
Jan 14 15:59:26
Jan 14 15:59:55
Jan 14 17:32:59
Jan 14 17:34:42
Jan 14 17:34:57
Jan 14 17:34:59
Jan 14 17:42:49
Jan 14 17:43:08
Jan 14 18:11:58
Jan 15 08:43:34
Jan 15 09:00:44
Jan 15 09:00:46
Jan 15 10:25:09
Jan 15 10:26:16
Jan 15 10:30:35
Jan 15 10:32:05
Jan 15 10:59:32
Jan 15 11:01:18
Jan 15 11:06:05
Jan 15 11:21:39
Jan 15 11:21:39
Jan 15 11:21:52
Jan 15 11:22:46
Jan 15 11:22:47
Jan 15 12:03:16
Jan 15 13:10:39
Jan 15 13:11:18
Jan 15 13:14:15
Jan 15 13:14:17
Jan 15 13:17:19
Jan 15 13:56:09
Jan 15 14:20:41
Jan 15 14:32:10
Jan 15 14:32:10
Jan 15 14:32:11
Jan 15 14:32:14
Jan 15 14:43:56
Jan 15 15:32:19
Jan 15 15:32:39
Jan 15 15:40:27
Jan 18 08:53:37
Jan 18 08:54:33
Jan 18 09:38:52
Jan 18 10:03:17
Jan 18 10:43:31
Jan 18 11:01:09
Jan 18 11:05:20
Jan 18 11:10:00
Jan 18 11:29:29
Jan 18 11:29:30
Jan 18 11:29:37
Jan 18 12:42:51
Jan 18 12:45:15
Jan 18 12:47:07
Jan 18 12:47:09
Jan 18 13:02:09
Jan 18 13:10:46

Azaz kizárólag akkor csinálja, ha a gépnél ülök.
Éjjel, vagy ha otthonról dolgozom SSH felett, akkor nem.
A gépen nincs semmi más USB periféria, (egér/klaviatúra sem):

$ lsusb
Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 038: ID 1809:4761 Advantech USB-4761 Portable Data Acquisition 
Module
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

Kinek van valami használható ötlete, mi okozhatja?
(Kárt nem okoz, de bosszant!)

kissg
-- 
Kérlek NE idézd az egész levelet, ha válaszolsz! Kösz.
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