T520 is pretty old but decent laptop even in 2021. As my old Linux Mint 17 was not getting any updates no longer I decided to upgrade to latest version.
This however proved to be a challenge as older Mint versions have problems with the SVIDEO output of the built-in Intel video-card, which has to be disabled.
Latest kernel 5.4.0.74 fixed the video issues, but refuses to boot. Live CD works fine due to restrictive settings, but cannot shutdown or reboot.
All of this can be fixed by editing kernel options.
- Open /etc/default/grub
- Add noapic to GRUB_CMDLINE_LINUX_DEFAULT line:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash noapic" - Update grub with: sudo update-grub
This solves boot, reboot and shutdown issues and also allows sleep/suspend.
