Bug 1611

\"/etc/rc.r/init.d/clock stop\" runs \"hwclock --systohc\" - this happens at each system shutdown or reboot. However, this command updates /etc/adjtime with assumption that the user has set the correct time - which is most likely not the case. Because of this, properly adjusting the speed of the RTC hardware clock is impossible - any such adjustment will be broken by this RTC setting at reboot (because the system clock might not have the correct speed too).

This problem is significant if a time synchronization service (ntp) is not used (which is a very common situation).

I propose to add several configuration parameters to /etc/sysconfig/clock to disable running \"hwclock --systohc\" at shutdown and to enable \"hwclock --adjust\" at startup (which is recommended by the hwclock man page):

HWCLOCK_SET_AT_HALT=false disables setting the RTC time from the system time at shutdown or reboot.

HWCLOCK_ADJUST=true enables running \"hwclock --adjust\" before \"hwclock --hctosys\" at startup.

The default values may be HWCLOCK_SET_AT_HALT=true, HWCLOCK_ADJUST=false to keep the old behavior by default (to avoid breaking the existing configurations). However, on new installs it may be better to set the opposite parameters (if the GUI/console configuration frontends to set the time use hwclock correctly).
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