Hi
On 4.7.2023 16.38, Christian Schaubschläger wrote:
Hi Mathias,
today I got access to another Dell Latitude model, which shows the exact same issue as the Latitude from before. This time it's a slightly older model with a 12th gen Intel CPU:
[ 0.000000] DMI: Dell Inc. Latitude 5430/0260KT, BIOS 1.12.0 03/20/2023
[ 0.092576] smpboot: CPU0: 12th Gen Intel(R) Core(TM) i5-1245U (family: 0x6, model: 0x9a, stepping: 0x4)
The issue is very easy to reproduce: just boot a recent Ubuntu 23.04 from an USB device, reboot, and the network interface on the dock is gone. Only re-plugging the dock's USB cable (or shutting down and restarting the system) helps to recover the net interface on the dock. I have three docks here (Dell WD19TB, Dell WD22TB4, Lenovo USB-C), all three show the same behaviour. Running the most recent linux kernel does not help.
If I can provide any useful logs I'd be happy to help, just let me know.
I have to check if we have similar machines and docks laying around.
I'm away until August so there will be some delay on my side
Thanks
Mathias
Thanks and best regards,
Christian
Am 01.06.23 um 15:54 schrieb Mathias Nyman:
On 31.5.2023 14.56, Christian Schaubschläger wrote:
Hi,
Attached is a patch that adds more debugging, adds a minimum
"power on to power good" delay, (as hub reports 0ms), and checks port link
states during hub initialization.
Does it help? Could you take logs with that patch applied.
Only dmesg with xhci and usbcore dynamic debug are needed.
xhci traces won't help as issue seems to be between the hub inthe dock and the NIC
patch applied, see logs in the attachment. The behaviour is unchanged.
Thanks,
Christian
Thanks,
In the failed case the hub in the dock doesn't show any activity
on port4 where the NIC is connected. No changes, link isn't in any
error state. It looks just like any empty port.
I don't have any idea what's going on.
I guess it's not possible to connect a protocol analyzer between the
hub in the dock and the NIC?
ok success case:
[ 1.712754] usb 6-2-port1: status 02a0 change 0000
[ 1.713070] usb 6-2-port2: status 02a0 change 0000
[ 1.713567] usb 6-2-port3: status 0203 change 0010 <- another hub
[ 1.714184] usb 6-2-port4: status 0203 change 0010 <- NIC
nok failed case:
[ 1.716756] usb 6-2-port1: status 02a0 change 0000
[ 1.717036] usb 6-2-port2: status 02a0 change 0000
[ 1.717395] usb 6-2-port3: status 0203 change 0010 <- another hub
[ 1.717976] usb 6-2-port4: status 02a0 change 0000
Thanks
Mathias
