Comment 17 for bug 1742675

Similar thing in my situation - all kernel including linux-image-4.13.0-25-generic work OK on my Asus Zenbook UX305FA but linux-image-4.13.0-26-generic makes my laptop almost unusable (everything is many times slower) and any newer version up to current linux-image-4.13.0-30-generic hang during start. On plymounth screen it boots up to progress bar and hangs just before showing mouse pointer (comparing to normal boot).

On the other hand all kernels from mainline PPA work without problem (including latest 4.14.13 and 4.15-RC8).