Both 3.8 and 3.11 work with reboot=p (https://wiki.ubuntu.com/BIOSandUbuntu#Reboot_Methods); 3.8 doesn't work with any other reboot=, which suggests the regression is caused by a change of default.
Both 3.8 and 3.11 work with reboot=p (https:/ /wiki.ubuntu. com/BIOSandUbun tu#Reboot_ Methods); 3.8 doesn't work with any other reboot=, which suggests the regression is caused by a change of default.