How to Fix: Vulkan is failing on linux with BadLength (poly request too large or internal Xlib length error)
Vulkan fails on Linux with BadLength error due to poly request size limit exceeded or internal Xlib length error. Solution involves adjusting Xorg-server version.
📋 Table of Contents
Vulkan is failing on Linux with 'BadLength' (poly request too large or internal Xlib length error) due to the limitations of the integrated video card and its driver, Mesa. This issue affects users who are trying to run Vulkan-based applications on Arch Linux without using Bumblebee or optirun.
This error can be frustrating for developers and gamers who rely on Vulkan for their work and entertainment. Fortunately, there are steps that can be taken to resolve this issue.
🛑 Root Causes of the Error
- The primary reason for this error is the limitation of the integrated video card's driver, Mesa, which does not support Vulkan. This is evident from the output of `optirun -vv vulkaninfo`, where the X Error message 'BadLength' indicates a problem with the poly request length.
- Another potential cause could be the size of the poly request being too large, but this is likely due to the limitations of Mesa's driver rather than an issue with the application itself.
🔧 Proven Troubleshooting Steps
Enabling Bumblebee and Using Optirun
- Step 1: Install Bumblebee and optirun using `pacaur -Qi vulkan-tools` and `pacaur -Qi xorg-server`. This will allow you to use the NVIDIA driver with Vulkan applications.
- Step 2: Configure Bumblebee to use the NVIDIA driver by editing `/etc/bumblebee/bumblebee.conf` and setting the `LD_LIBRARY_PATH` variable to include the path to the NVIDIA library.
- Step 3: Run `optirun -vv vulkaninfo` to verify that Vulkan is working correctly with optirun enabled.
Using a Different Vulkan Driver
- Step 1: Try using a different Vulkan driver, such as the NVIDIA driver from the official website, instead of Mesa. This may require installing the driver manually and adjusting the `LD_LIBRARY_PATH` variable accordingly.
- Step 2: Note that this method may not be available for all users and may require technical expertise to set up.
✨ Wrapping Up
By enabling Bumblebee and using optirun or trying a different Vulkan driver, users can resolve the 'BadLength' error and run Vulkan-based applications on Arch Linux without issues.
❓ Frequently Asked Questions
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