The flashing capslock LED is a kernel-has-crashed (aka "OOPS") indicator. It certainly looks like a bug in the microcode loader.
For the record: It is possible to bypass the microcode loader. That would allow you to test that it is indeed the microcode loader, or to fix the system if you did not have a backup kernel/initramfs. To bypass the microcode loader, inside the boot loader (grub), instead of lauching the boot, you ask it to edit the boot config, scroll down to the "kernel command line" (starts with "linux"), and add "dis_ucode_ldr" (without the quotes). Then you tell grub to proceed booting. More details: https://help.ubuntu.com/community/Grub2/Troubleshooting#Editing_the_GRUB_2_Menu_During_Boot Anyway, it looks like this bug should be reassigned to the kernel. You will have to provide a lot more information for anyone to be able to help you, though. Relevant information: contents of /proc/cpuinfo, exactly what kernel is crashing (32 bit? 64 bit? package version?), and if at all possible, kernel logs when it crashes (boot in verbose mode to see). Also could be of help if you want to provide more data (without which this bug cannot be solved): https://wiki.ubuntu.com/DebuggingKernelBoot -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1662097 Title: lenovo t500 kernel hangs with flashing caps lock LED after installing intel-microcode To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/intel-microcode/+bug/1662097/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
