* ttyACM strange chars appearing at connect @ 2020-05-19 12:14 Joakim Tjernlund 2020-05-19 12:54 ` Greg KH 0 siblings, 1 reply; 6+ messages in thread From: Joakim Tjernlund @ 2020-05-19 12:14 UTC (permalink / raw) To: linux-usb@vger.kernel.org Whenever we connect a Linux laptop(4.19.118) to our ttyACM serial gadget we can see som strange chars appearing in our gadget: 03�`3�03�x�x(in hex: 3033 efbf bd60 33ef bfbd 3033 efbf bd78 efbf bd78) They appear witch c.a 1 sec in between. I assume it is the laptops ACM driver emitting those, but why? Can these chars be turned off? Jocke ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: ttyACM strange chars appearing at connect 2020-05-19 12:14 ttyACM strange chars appearing at connect Joakim Tjernlund @ 2020-05-19 12:54 ` Greg KH 2020-05-19 13:24 ` Joakim Tjernlund 2020-05-20 12:43 ` Joakim Tjernlund 0 siblings, 2 replies; 6+ messages in thread From: Greg KH @ 2020-05-19 12:54 UTC (permalink / raw) To: Joakim Tjernlund; +Cc: linux-usb@vger.kernel.org On Tue, May 19, 2020 at 12:14:55PM +0000, Joakim Tjernlund wrote: > Whenever we connect a Linux laptop(4.19.118) to our ttyACM serial gadget we can see som strange > chars appearing in our gadget: > 03�`3�03�x�x(in hex: 3033 efbf bd60 33ef bfbd 3033 efbf bd78 efbf bd78) > They appear witch c.a 1 sec in between. > I assume it is the laptops ACM driver emitting those, but why? Can these chars be turned off? It's a program on your laptop probing the device. Usually modemmanager or something like that. greg k-h ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: ttyACM strange chars appearing at connect 2020-05-19 12:54 ` Greg KH @ 2020-05-19 13:24 ` Joakim Tjernlund 2020-05-20 12:43 ` Joakim Tjernlund 1 sibling, 0 replies; 6+ messages in thread From: Joakim Tjernlund @ 2020-05-19 13:24 UTC (permalink / raw) To: gregkh@linuxfoundation.org; +Cc: linux-usb@vger.kernel.org On Tue, 2020-05-19 at 14:54 +0200, Greg KH wrote: > CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe. > > > On Tue, May 19, 2020 at 12:14:55PM +0000, Joakim Tjernlund wrote: > > Whenever we connect a Linux laptop(4.19.118) to our ttyACM serial gadget we can see som strange > > chars appearing in our gadget: > > 03�`3�03�x�x(in hex: 3033 efbf bd60 33ef bfbd 3033 efbf bd78 efbf bd78) > > They appear witch c.a 1 sec in between. > > I assume it is the laptops ACM driver emitting those, but why? Can these chars be turned off? > > It's a program on your laptop probing the device. Usually modemmanager > or something like that. Ahh, makes sense. Now I need to see how to turn it off(NetworManager pulls it in) ... Jocke ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: ttyACM strange chars appearing at connect 2020-05-19 12:54 ` Greg KH 2020-05-19 13:24 ` Joakim Tjernlund @ 2020-05-20 12:43 ` Joakim Tjernlund 2020-05-20 13:08 ` Dan Williams 1 sibling, 1 reply; 6+ messages in thread From: Joakim Tjernlund @ 2020-05-20 12:43 UTC (permalink / raw) To: gregkh@linuxfoundation.org; +Cc: linux-usb@vger.kernel.org On Tue, 2020-05-19 at 14:54 +0200, Greg KH wrote: > CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe. > > > On Tue, May 19, 2020 at 12:14:55PM +0000, Joakim Tjernlund wrote: > > Whenever we connect a Linux laptop(4.19.118) to our ttyACM serial gadget we can see som strange > > chars appearing in our gadget: > > 03�`3�03�x�x(in hex: 3033 efbf bd60 33ef bfbd 3033 efbf bd78 efbf bd78) > > They appear witch c.a 1 sec in between. > > I assume it is the laptops ACM driver emitting those, but why? Can these chars be turned off? > > It's a program on your laptop probing the device. Usually modemmanager > or something like that. > > greg k-h Right you were, it was modemmanager :) Fixing that I can occasion se in my DE: [Wed May 20 14:03:16 2020] cdc_ether 1-6.2:1.0 usb0: unregister 'cdc_ether' usb-0000:00:14.0-6.2, CDC Ethernet Device [Wed May 20 14:03:25 2020] usb usb1-port6: disabled by hub (EMI?), re-enabling... [Wed May 20 14:03:25 2020] usb 1-6: USB disconnect, device number 85 [Wed May 20 14:03:25 2020] cdc_acm 1-6.3:1.1: acm_ctrl_irq - usb_submit_urb failed: -19 [Wed May 20 14:03:25 2020] usb 1-6-port2: attempt power cycle [Wed May 20 14:03:26 2020] usb 1-6.3: USB disconnect, device number 86 [Wed May 20 14:03:26 2020] cdc_acm 1-6.3:1.1: failed to set dtr/rts [Wed May 20 14:03:26 2020] usb 1-6: new high-speed USB device number 94 using xhci_hcd [Wed May 20 14:03:27 2020] hub 1-6:1.0: USB hub found [Wed May 20 14:03:27 2020] hub 1-6:1.0: 3 ports detected [Wed May 20 14:03:27 2020] usb 1-6.2: new high-speed USB device number 95 using xhci_hcd [Wed May 20 14:03:27 2020] cdc_ether 1-6.2:1.0 usb0: register 'cdc_ether' at usb-0000:00:14.0-6.2, CDC Ethernet Device, 7e:1d:06:c0:3f:3c [Wed May 20 14:03:27 2020] usb 1-6.3: new high-speed USB device number 96 using xhci_hcd [Wed May 20 14:03:27 2020] cdc_acm 1-6.3:1.1: ttyACM0: USB ACM device This "disabled by hub (EMI?), re-enabling" may be from: EM interference sometimes causes bad shielded USB devices to be shutdown by the hub, this hack enables them again. But a another side effect from this is that I get a lot of garbage chars in the other end, like: h�^@^@� ^@^@� ^@ or X���)H��4Ğ^��� I wonder if this can be caused by the USB/ACM driver ? Jocke ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: ttyACM strange chars appearing at connect 2020-05-20 12:43 ` Joakim Tjernlund @ 2020-05-20 13:08 ` Dan Williams 2020-05-20 13:29 ` Joakim Tjernlund 0 siblings, 1 reply; 6+ messages in thread From: Dan Williams @ 2020-05-20 13:08 UTC (permalink / raw) To: Joakim Tjernlund, gregkh@linuxfoundation.org; +Cc: linux-usb@vger.kernel.org On Wed, 2020-05-20 at 12:43 +0000, Joakim Tjernlund wrote: > On Tue, 2020-05-19 at 14:54 +0200, Greg KH wrote: > > CAUTION: This email originated from outside of the organization. Do > > not click links or open attachments unless you recognize the sender > > and know the content is safe. > > > > > > On Tue, May 19, 2020 at 12:14:55PM +0000, Joakim Tjernlund wrote: > > > Whenever we connect a Linux laptop(4.19.118) to our ttyACM serial > > > gadget we can see som strange > > > chars appearing in our gadget: > > > 03�`3�03�x�x(in hex: 3033 efbf bd60 33ef bfbd 3033 efbf bd78 efbf > > > bd78) > > > They appear witch c.a 1 sec in between. > > > I assume it is the laptops ACM driver emitting those, but why? > > > Can these chars be turned off? > > > > It's a program on your laptop probing the device. Usually > > modemmanager > > or something like that. > > > > greg k-h > > Right you were, it was modemmanager :) If the device has a unique ID that isn't a modem, it can be added to ModemManager's blacklist. Also note that recent versions of ModemManager flipped the logic and will only probe *known* modems, require explicit requests to probe possible modems, and of course won't probe anything on the blacklist. Dan > Fixing that I can occasion se in my DE: > [Wed May 20 14:03:16 2020] cdc_ether 1-6.2:1.0 usb0: unregister > 'cdc_ether' usb-0000:00:14.0-6.2, CDC Ethernet Device > [Wed May 20 14:03:25 2020] usb usb1-port6: disabled by hub (EMI?), > re-enabling... > [Wed May 20 14:03:25 2020] usb 1-6: USB disconnect, device number 85 > [Wed May 20 14:03:25 2020] cdc_acm 1-6.3:1.1: acm_ctrl_irq - > usb_submit_urb failed: -19 > [Wed May 20 14:03:25 2020] usb 1-6-port2: attempt power cycle > [Wed May 20 14:03:26 2020] usb 1-6.3: USB disconnect, device number > 86 > [Wed May 20 14:03:26 2020] cdc_acm 1-6.3:1.1: failed to set dtr/rts > [Wed May 20 14:03:26 2020] usb 1-6: new high-speed USB device number > 94 using xhci_hcd > [Wed May 20 14:03:27 2020] hub 1-6:1.0: USB hub found > [Wed May 20 14:03:27 2020] hub 1-6:1.0: 3 ports detected > [Wed May 20 14:03:27 2020] usb 1-6.2: new high-speed USB device > number 95 using xhci_hcd > [Wed May 20 14:03:27 2020] cdc_ether 1-6.2:1.0 usb0: register > 'cdc_ether' at usb-0000:00:14.0-6.2, CDC Ethernet Device, > 7e:1d:06:c0:3f:3c > [Wed May 20 14:03:27 2020] usb 1-6.3: new high-speed USB device > number 96 using xhci_hcd > [Wed May 20 14:03:27 2020] cdc_acm 1-6.3:1.1: ttyACM0: USB ACM device > > This "disabled by hub (EMI?), re-enabling" may be from: > EM interference sometimes causes bad shielded USB devices to > be shutdown by the hub, this hack enables them again. > > But a another side effect from this is that I get a lot of garbage > chars in the other end, like: > h�^@^@� ^@^@� ^@ > or > X���)H��4Ğ^��� > I wonder if this can be caused by the USB/ACM driver ? > > Jocke ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: ttyACM strange chars appearing at connect 2020-05-20 13:08 ` Dan Williams @ 2020-05-20 13:29 ` Joakim Tjernlund 0 siblings, 0 replies; 6+ messages in thread From: Joakim Tjernlund @ 2020-05-20 13:29 UTC (permalink / raw) To: gregkh@linuxfoundation.org, dcbw@redhat.com; +Cc: linux-usb@vger.kernel.org On Wed, 2020-05-20 at 08:08 -0500, Dan Williams wrote: > On Wed, 2020-05-20 at 12:43 +0000, Joakim Tjernlund wrote: > > On Tue, 2020-05-19 at 14:54 +0200, Greg KH wrote: > > > CAUTION: This email originated from outside of the organization. Do > > > not click links or open attachments unless you recognize the sender > > > and know the content is safe. > > > > > > > > > On Tue, May 19, 2020 at 12:14:55PM +0000, Joakim Tjernlund wrote: > > > > Whenever we connect a Linux laptop(4.19.118) to our ttyACM serial > > > > gadget we can see som strange > > > > chars appearing in our gadget: > > > > 03�`3�03�x�x(in hex: 3033 efbf bd60 33ef bfbd 3033 efbf bd78 efbf > > > > bd78) > > > > They appear witch c.a 1 sec in between. > > > > I assume it is the laptops ACM driver emitting those, but why? > > > > Can these chars be turned off? > > > > > > It's a program on your laptop probing the device. Usually > > > modemmanager > > > or something like that. > > > > > > greg k-h > > > > Right you were, it was modemmanager :) > > If the device has a unique ID that isn't a modem, it can be added to > ModemManager's blacklist. Yes, I did that: cat /etc/udev/rules.d/70-mm-usb-LC-blacklist.rules ACTION!="add|change|move|bind", GOTO="mm_usb_device_blacklist_end" SUBSYSTEM!="usb", GOTO="mm_usb_device_blacklist_end" # XTM LC serial port ATTRS{idVendor}=="0424", ATTRS{idProduct}=="274e", ENV{ID_MM_TTY_BLACKLIST}="1" LABEL="mm_usb_device_blacklist_end" > > Also note that recent versions of ModemManager flipped the logic and > will only probe *known* modems, require explicit requests to probe > possible modems, and of course won't probe anything on the blacklist. I got 1.12.6, not new enough I guess? > > Dan > > > Fixing that I can occasion se in my DE: > > [Wed May 20 14:03:16 2020] cdc_ether 1-6.2:1.0 usb0: unregister > > 'cdc_ether' usb-0000:00:14.0-6.2, CDC Ethernet Device > > [Wed May 20 14:03:25 2020] usb usb1-port6: disabled by hub (EMI?), > > re-enabling... > > [Wed May 20 14:03:25 2020] usb 1-6: USB disconnect, device number 85 > > [Wed May 20 14:03:25 2020] cdc_acm 1-6.3:1.1: acm_ctrl_irq - > > usb_submit_urb failed: -19 > > [Wed May 20 14:03:25 2020] usb 1-6-port2: attempt power cycle > > [Wed May 20 14:03:26 2020] usb 1-6.3: USB disconnect, device number > > 86 > > [Wed May 20 14:03:26 2020] cdc_acm 1-6.3:1.1: failed to set dtr/rts > > [Wed May 20 14:03:26 2020] usb 1-6: new high-speed USB device number > > 94 using xhci_hcd > > [Wed May 20 14:03:27 2020] hub 1-6:1.0: USB hub found > > [Wed May 20 14:03:27 2020] hub 1-6:1.0: 3 ports detected > > [Wed May 20 14:03:27 2020] usb 1-6.2: new high-speed USB device > > number 95 using xhci_hcd > > [Wed May 20 14:03:27 2020] cdc_ether 1-6.2:1.0 usb0: register > > 'cdc_ether' at usb-0000:00:14.0-6.2, CDC Ethernet Device, > > 7e:1d:06:c0:3f:3c > > [Wed May 20 14:03:27 2020] usb 1-6.3: new high-speed USB device > > number 96 using xhci_hcd > > [Wed May 20 14:03:27 2020] cdc_acm 1-6.3:1.1: ttyACM0: USB ACM device > > > > This "disabled by hub (EMI?), re-enabling" may be from: > > EM interference sometimes causes bad shielded USB devices to > > be shutdown by the hub, this hack enables them again. > > > > But a another side effect from this is that I get a lot of garbage > > chars in the other end, like: > > h�^@^@� ^@^@� ^@ > > or > > X���)H��4Ğ^��� > > I wonder if this can be caused by the USB/ACM driver ? > > > > Jocke ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2020-05-20 13:29 UTC | newest] Thread overview: 6+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2020-05-19 12:14 ttyACM strange chars appearing at connect Joakim Tjernlund 2020-05-19 12:54 ` Greg KH 2020-05-19 13:24 ` Joakim Tjernlund 2020-05-20 12:43 ` Joakim Tjernlund 2020-05-20 13:08 ` Dan Williams 2020-05-20 13:29 ` Joakim Tjernlund
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