Piotr Czekalski's questions

I'm struggling to access an MCU connected to the USB and presented as a serial port: /dev/ttyACM0. What worked well in Ubuntu 22.04 does not work in 24.04. Whenever I connect the device, the only way to have it access is to chmod 666 it, but that works only temporarily.

The user I'm working on is already added to the dialout group, and ls -l /dev/ttyACM0 returns: crw-rw---- 1 root dialout 166, 0 Oct 25 15:33 /dev/ttyACM0 , so as I can understand it, it is the root who has r/w and any dialout group member. Am I missing anything here to configure/add?

Edit: The driver seems to be correct so that is not the case of invalid UDEV rule triggered:

[21856.363341] usb 3-6: new full-speed USB device number 6 using xhci_hcd
[21856.761217] usb 3-6: New USB device found, idVendor=2e8a, idProduct=0005, bcdDevice= 1.00
[21856.761236] usb 3-6: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[21856.761240] usb 3-6: Product: Board in FS mode
[21856.761244] usb 3-6: Manufacturer: MicroPython
[21856.761247] usb 3-6: SerialNumber: e6614c311b7f8c38
[21857.365083] cdc_acm 3-6:1.0: ttyACM0: USB ACM device
[21857.365219] usbcore: registered new interface driver cdc_acm
[21857.365225] cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters

Regards,

Piotr

I successfully made it to mount the iSCSI drive from my Ubuntu 20.04 to the QNAP NAS (via fstab). Works like charm if only QNAP is up when the Ubuntu server starts. When QNAP reboots, obviously connection is broken and the iSCSI service goes down.

How do I automatically restart and re-mount the resource then? So far, the easiest is just to reboot, eventually, do it manually or sort of crone-based script. Is there any mechanism I'm missing?

I'm having an issue with the Plank dock (launcher) on Ubuntu 20.04. I have a configuration with the "Autohide" feature "on". Once I do any configuration change to the desktop (i.e. switching on/of an external monitor or changing the resolution of external/internal screen), the dock will not show up anymore on the mouse over, as it used to work normally.

The only solution so far is that I can start another instance (and have two, one hidden, one working, showing an icon of the other one), eventually kill the first Plank process and re-launch it, so it works again.

It also happens when I put my laptop to sleep mode and then reconnect it back to the dock with external monitors.

Even if I already have a quick fix, that is very frustrating.

Any help is appreciated.

After the latest updates, my Lenovo Yoga X390 hangs whenever I use Wacom Stylus. So far everything was ok till the recent kernel update. Now touching the screen with a stylus causes immediate os hang (had to do a hard reset).

Removing the Wacom kernel module solves the problem temporarily, as pen and touch work, but obviously, there is no pressure sensitivity.

$ lsmod | grep wacom
wacom                 118784  0
usbhid                 57344  1 wacom
hid                   135168  5 wacom,usbhid,hid_sensor_hub,intel_ishtp_hid,hid_generic

dmesg does not show any errors.

The kernel is:

Linux n317-pc01 5.8.0-45-generic #51~20.04.1-Ubuntu SMP Tue Feb 23 13:46:31 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

Any help is highly appreciated.

I'm experiencing a strange behaviour when using corporate PDF documents and trying to follow links:

1. PDFs comes by email (using Thunderbird)
2. I open it directly from the attachment, with Evince
3. PDF has internal links that point me to our corporate website and this requires logging in to access content
4. Once clicked in PDF, it opens Google Chrome (my default browser) and ... once the user and password dialogue appears, the keyboard does not work. I cannot enter credentials.

If I right-click the link in PDF and copy the URL, then paste it in manually open chrome, it works without any problems.

I checked if downloading the document to the disk first, and then opening it locally (not directly from the Thunderbird) helps, but still, it does not: it opens a browser, asks to log in on my corporate website and login dialogue box won't let me type anything there.

BTW - the login type is an NT challenge/response type (the targer server is IIS), not the one embedded in the HTML page, it pops up.

Any help is appreciated.

I'm trying to solve the not working (actually partially working) Thunderbolt dock once I connect it after Ubuntu is booted.

Partially, because on reconnecting Thunderbolt on the already booted system with Ubuntu 19.04 I cannot make USB devices working, while i.e. all monitors connected to the dock work well (not always, but usually).

This happens in the following scenario - boot my Yoga not connected to the Thunderbolt dock then connect to it;

If I face the situation above, rebooting help without the need to re-connect the dock.

If I connect the dock before starting Ubuntu, everything is fine and all devices connected to dock work.

I believe the problem is a "hot connect": USB somehow is not detected on hotplug when OS is run (or actually is partially connected, because displays connected to the dock wake up but none of the USB devices is visible.

The machine is Thinkpad Yoga X390 and the dock is HP Thunderbolt Dock G2 230W.

Any help is appreciated.

I've just installed Ubuntu 19.04 on Lenovo Yoga X390 convertible laptop. Autorotation does not work in Gnome Desktop but surprisingly works well during GDM when login prompt is displayed. iio-sensor-proxy service seems to be OK,

systemctl status iio-sensor-proxy.service
iio-sensor-proxy.service - IIO Sensor Proxy service
Loaded: loaded (/lib/systemd/system/iio-sensor-proxy.service; static;  
vendor 
Active: active (running) since Sun 2019-08-25 09:16:17 CEST; 12min ago
Main PID: 1437 (iio-sensor-prox)
Tasks: 3 (limit: 4915)
Memory: 2.0M
CGroup: /system.slice/iio-sensor-proxy.service
       └─1437 /usr/sbin/iio-sensor-proxy

sie 25 09:16:17 N317-PC10 systemd[1]: Starting IIO Sensor Proxy service...
sie 25 09:16:17 N317-PC10 systemd[1]: Started IIO Sensor Proxy service.

monitor-sensor can recognize screen rotation well:

monitor-sensor 
Waiting for iio-sensor-proxy to appear
+++ iio-sensor-proxy appeared
=== Has accelerometer (orientation: normal)
=== No ambient light sensor
Accelerometer orientation changed: right-up
Accelerometer orientation changed: normal
Accelerometer orientation changed: left-up
Accelerometer orientation changed: normal

But Gnome desktop won't rotate. I believe it is to be done automatically but it does not work. Any hints? Surely I can write a script that runs in the background, monitor monitor-sensor and reacts appropriately to the reported rotation but on my previous Yoga S1 it was working out of the box without any additional setup.

Update 4.12.2019: Seems there is no update to the service sent from the accelerometer. I can manually trigger it via i.e.

cat /sys/bus/iio/devices/iio:device0/in_accel_x_raw

still it worked and stopped since latest updates, eventually randomly fails.

I'm having a problem with Nautilus, showing an alphabetical list of files and folders. Obviously, an option to list folders first then files, is gone. I noticed listing order change after some upgrade (hard to say now, which one was that):

I was trying the solution proposed here: Nautilus: Make “Show folders before files” option persist?, with no luck. I do not notice the permission problems when starting Nautilus from the bash. Is there any magic configuration setting to change the listing for Folders First?

I'm having problems using Rabbit VCS integration with Nautilus under Ubuntu 18.04. Installation from the Bionic Beaver PPA does not seem to work at all while using the procedure presented on their web page, as there is not a candidate for 18.04.

Any hints on how to make it running?

Thanks in advance.