Before revision: Use and compatibilityupright = 1.5|A Linux boot log showing the switch from HPET to TSC as system clocksourceOperating systems designed before HPET existed cannot use HPET, so they use other timer facilities.
After revision: = 1.5|A Linux boot log showing the switch from HPET to TSC as system clocksourceOperating systems designed before HPET existed cannot use HPET, so they use other timer facilities.