/dev/ttyUSB0 disappears after using QLC+
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pauljurczak
- Posts: 2
- Joined: Sat May 27, 2023 5:13 pm
- Real Name: Paul Jurczak
I'm using QLC+ 4.12.7 on Ubuntu 22.04.2 with FT232R USB/RS485 dongle listed as /dev/ttyUSB0 device. After closing the QLC+, this device disappears and requires unplugging and plugging the dongle to be visible again.
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OliveHarmon
- Posts: 1
- Joined: Sat Jun 10, 2023 9:01 am
- Real Name: Olive Harmon
This issue could be related to how the USB device is being handled by the operating system or the software itself. Here are a few troubleshooting steps you can try to resolve the problem:
Ensure that you have the latest drivers for the FT232R USB/RS485 dongle. Visit the manufacturer's website and download the most recent drivers for Ubuntu 22.04.2. Install the drivers and see if the issue persists.
Check if the device is being claimed by any other drivers or processes. Sometimes, other programs may be interfering with the dongle's functionality. You can use the lsmod command in the terminal to see a list of loaded kernel modules. Look for any modules related to the FT232R dongle and try unloading them before closing QLC+. For example, if you find a module named ftdi_sio, you can unload it using the sudo rmmod ftdi_sio command.
Verify that the dongle is not being power-managed or suspended by the system. USB power management settings can sometimes cause issues with device recognition. Open the "Power" settings in Ubuntu and ensure that USB autosuspend is disabled or set to a longer duration.
Try running QLC+ with administrative privileges. Launch the application using the sudo command in the terminal: sudo qlcplus. This can sometimes help with device access and prevent it from disappearing after closing the software.
If none of the above steps resolve the issue, consider updating QLC+ to the latest version. Newer versions may have bug fixes or improvements related to device handling. Visit the QLC+ website or community forums to check for any reported issues or updates specific to your setup.
Ensure that you have the latest drivers for the FT232R USB/RS485 dongle. Visit the manufacturer's website and download the most recent drivers for Ubuntu 22.04.2. Install the drivers and see if the issue persists.
Check if the device is being claimed by any other drivers or processes. Sometimes, other programs may be interfering with the dongle's functionality. You can use the lsmod command in the terminal to see a list of loaded kernel modules. Look for any modules related to the FT232R dongle and try unloading them before closing QLC+. For example, if you find a module named ftdi_sio, you can unload it using the sudo rmmod ftdi_sio command.
Verify that the dongle is not being power-managed or suspended by the system. USB power management settings can sometimes cause issues with device recognition. Open the "Power" settings in Ubuntu and ensure that USB autosuspend is disabled or set to a longer duration.
Try running QLC+ with administrative privileges. Launch the application using the sudo command in the terminal: sudo qlcplus. This can sometimes help with device access and prevent it from disappearing after closing the software.
If none of the above steps resolve the issue, consider updating QLC+ to the latest version. Newer versions may have bug fixes or improvements related to device handling. Visit the QLC+ website or community forums to check for any reported issues or updates specific to your setup.
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pauljurczak
- Posts: 2
- Joined: Sat May 27, 2023 5:13 pm
- Real Name: Paul Jurczak
Thank you for a detailed response.