excerpt from /var/log/apt/history.log:
Update from 73 to 74:
Commandline: aptdaemon role='role-commit-packages' sender=':1.165'
Install: linux-image-5.4.0-74-generic:amd64 (5.4.0-74.83, automatic),...
Update firmware/microcode:
Commandline: aptdaemon role='role-commit-packages' sender=':1.173'
Upgrade: intel-microcode:amd64 (3.20210216.0ubuntu0.20.04.1,
3.20210608.0ubuntu0.20.04.1), linux-firmware:amd64 (1.187.12, 1.187.14)
** Also affects: intel-microcode (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux-firmware (Ubuntu)
Importance: Undecided
Status: New
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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1931684
Title:
cdc_acm: acm_port_activate - usb_submit_urb(ctrl irq) failed
Status in intel-microcode package in Ubuntu:
New
Status in linux package in Ubuntu:
Confirmed
Status in linux-firmware package in Ubuntu:
New
Bug description:
Ubuntu 18.04.5 LTS
Recently, after kernel update 4.15.0.144 (didn't know about the case yet), i
can't open serial ports on USB CDC devices (STM32 Virtual COMs in my case).
using simple cat command (with or without sudo):
$ sudo cat /dev/ttyACM1
cat: /dev/ttyACM1: Input/output error
or some serial programs:
Failed to connect to /dev/ttyACM1 : [Errno 5] could not open port
/dev/ttyACM1: [Errno 5] Input/output error: '/dev/ttyACM1'
dmesg:
[ 3295.718270] cdc_acm 1-2:1.0: ttyACM1: USB ACM device
[ 3302.508356] cdc_acm 1-2:1.0: acm_port_activate - usb_submit_urb(ctrl irq)
failed
[ 3302.508940] cdc_acm 1-2:1.0: acm_port_activate - usb_submit_urb(ctrl irq)
failed
When i try spamming commands while plugging the device in, i am
sometimes able to open the port (might be the clue).
When i booted in ubuntu advanced mode to 4.15.0.143 kernel, everything
started to work normally.
Also tried HWE stack with 5.4.0.74 kernel, but the bug was also
present there.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/intel-microcode/+bug/1931684/+subscriptions
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