/dev/ttyACM3 not showing

hi
    bought arduino uno , trying play under ubuntu, when following problem appeared.

when plug arduino on computer usb, in dmesg:

code: [select]


[15198.924211] usb 3-1: new full-speed usb device number 14 using xhci_hcd
[15199.001083] usb 3-1: ep 0x82 - rounding interval 1024 microframes, ep desc says 2040 microframes
[15199.002852] cdc_acm 3-1:1.0: ttyacm3: usb acm device


so start ide, found ttyacm3 there, , try upload on board.it says ttyacm3 not found anymore , asks me select other ports, of course didn't work.

so dmesg , get:

code: [select]


[15279.574649] xhci_hcd 0000:04:00.0: error no room on ep ring
[15279.574655] cdc_acm 3-1:1.1: acm_submit_read_urb - usb_submit_urb failed: -12
[15279.574659] tty_port_close_start: tty->count = 1 port count = 0.


and in fact /dev/ttyacm3 disappeared.

any hints? on windows works fine, i'd use linux since else there.

thanks

i'm using ubuntu, , found if unplug, , reconnect usb cable computer fast, ttyacm number increases. appears me experience, have unplugged , replugged fast 3 times(?). try unplugging minute, plug in again.

you can check /dev/ directory , see shows there when plug in arduino. should add 1 port, /dev/ttyacm0

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