I have a Thinkpad 460s with dualboot: Fedora and Windows. I am using grub2 as a bootloader. 4.5.7-200 boots fine, but 4.5.7-202 and the newly released 4.6.4-201 doesn't boot up, grub shows a blinking cursor instead.
You probably have this issue: https://www.happyassassin.net/2016/07/07/psa-failure-to-boot-after-kernel-update-on-skylake-systems/
It is related to a kernel update on Skylake cpu
In case the link dies here are some workarounds:
- Boot an older kernel.
- Boot with the kernel parameter dis_ucode_ldr.
- Downgrade the microcode_ctl package to version 2.1-11 or earlier and force an initramfs rebuild, either with dracut or by reinstalling the packages for the kernels that don’t boot.