In this article, we will delve into a common issue that users of Ubuntu 22.04.1 LTS with an RTX 3060Ti graphics card may encounter: the “Failed to Allocate NvKmsKapiDevice” error. This error often arises after booting the PC, with one or more monitors failing to work and error messages related to DRM and NvKmsKapiDevice allocation being displayed. Fear not, as we will guide you through a series of steps to troubleshoot and resolve this issue.
Understanding the Error
Before we delve into the solution, it’s important to understand the root of the problem. The “Failed to Allocate NvKmsKapiDevice” error is often related to compatibility issues between the Nvidia drivers and the kernel version of your Ubuntu system.
Step 1: Check for Kernel Updates
The first step in troubleshooting this issue is to check for any kernel updates. This can be done by running the following command in your terminal:
sudo apt update && sudo apt upgrade
sudo command allows you to run commands with administrative privileges,
apt update updates the list of available packages and their versions, and
apt upgrade installs available upgrades of all packages currently installed on the system. After running this command, reboot your system and check if the issue persists.
Step 2: Roll Back the Nvidia Driver
If the issue started after a recent driver update, you might want to consider rolling back to a previous version that was known to work. To do this, you will need to remove all Nvidia-related packages with the following command:
sudo apt remove nvidia*
nvidia* acts as a wildcard, matching any string of characters, thus removing all packages that start with ‘nvidia’.
Once you have done this, run the following command to remove any remaining dependencies:
sudo apt autoremove
Afterward, install a known working driver version, such as
nvidia-driver-510, using the following command:
sudo apt install --reinstall nvidia-driver-510
--reinstall option reinstalls the specified package, in this case,
nvidia-driver-510. Reboot your system and check if the issue is resolved.
Step 3: Check for Conflicting Drivers
Sometimes, the issue might be caused by conflicting drivers installed on your system. To check if the open-source Nouveau driver is loaded, use the following command:
lsmod | grep nouveau
lsmod command shows the status of modules in the Linux kernel, and
grep nouveau filters the output for lines containing ‘nouveau’.
If the Nouveau driver is loaded, you can blacklist it by creating a file named
blacklist-nouveau.conf in the
/etc/modprobe.d/ directory with the following contents:
options nouveau modeset=0
This effectively prevents the Nouveau driver from loading during boot. Save the file and reboot your system.
Step 4: Generate Nvidia Bug Report
If the issue persists, it might be helpful to generate a bug report using the
nvidia-bug-report.sh script. Run the following command in a terminal:
This will generate a compressed log file which you can share on relevant forums or with Nvidia support for further assistance.
Step 5: Seek Community Support
If none of the above steps resolve the issue, consider seeking help from the Ubuntu Forums or the Nvidia Developer Forums. These communities are filled with users and experts who might be able to provide specific solutions or insights. Be sure to include all relevant details and the generated bug report when describing your problem.
The “Failed to Allocate NvKmsKapiDevice” error on Ubuntu 22.04.1 LTS with an RTX 3060Ti can be a daunting issue to face, but with the right troubleshooting steps, it can be resolved. Remember, if none of the suggested steps work, it is recommended to seek further assistance from the Ubuntu or Nvidia support channels for a more tailored solution.
To check your kernel version in Ubuntu, you can open a terminal and run the following command:
uname -r. This will display the kernel version of your system.
To install a specific Nvidia driver version in Ubuntu, you can use the
apt package manager. For example, to install version 510 of the Nvidia driver, you can run the following command:
sudo apt install nvidia-driver-510. Replace
510 with the desired version number.
To create a file in the
/etc/modprobe.d/ directory, you can use a text editor with administrative privileges. For example, you can run
sudo nano /etc/modprobe.d/blacklist-nouveau.conf to create and open the file
blacklist-nouveau.conf with the
nano text editor. Replace
nano with your preferred text editor if needed.
To share the generated bug report, you can upload the compressed log file to relevant forums or share it with Nvidia support. You can use file-sharing services or attach the file directly to your forum post or support ticket.
To seek help from the Ubuntu Forums, you can visit the official Ubuntu Forums website (https://ubuntuforums.org/) and create a new thread describing your issue. Be sure to provide all relevant details and the generated bug report.
To seek help from the Nvidia Developer Forums, you can visit the Nvidia Developer Forums website (https://forums.developer.nvidia.com/) and create a new topic in the appropriate category. Again, provide all necessary details and the bug report for better assistance.