Engineers from Canonical have warned of regressions in the upcoming kernel package update 7.0.0-28.28, which will be delivered to users. Ubuntu 26.04 and Ubuntu April 24.04. A regression occurs when using the amdgpu driver and leads to a significant performance drop in some applications using the AMD ROCm stack. For example, due to the regression, the execution time of the Stable Diffusion XL (SDXL) model using ComfyUI slowed by a factor of 42 (from 9 seconds to 388 seconds).
The issue was reported in a kernel update. Linux 7.0.12, on the basis of which version 7.0.0-28.28 of the kernel package is compiled for UbuntuIt is noted that the prepared update contains fixes for important vulnerabilities, and Canonical cannot delay it due to the reported regression. Therefore, it has been decided to release it as is, and the regression will be addressed in the next corrective update. Users for whom the reported regression is more critical than the vulnerability fix may choose not to upgrade to release 7.0.0-28.28 and wait for the next update.
The issue also affects kernel 7.0.12 packages released for Fedora, CachyOS, and other distributions. LinuxThe issue was fixed in kernel release 7.0.13. The "--disable-mmap" flag can be used as a workaround to resolve the regression in ComfyUI.
Source: opennet.ru
