[Bug 43745] Re: Ubuntu corrupts real time clock on some dell laptops

[Iulian D.]

I have a Dell Inspiron 6400, running Edgy with some packages from
Feisty, in particular kernel 2.6.20-9-lowlatency, version 2.6.20-9.16.

I frequently put the laptop in suspend-to-disk using `hibernate`. After
a number of hibernate-wakeup cycles, it starts going downhill.

First, the Grub timer doesn't count down. But I can hit Esc and then
select the kernel manually, then the system boots and restores my
desktop OK. The desktop clock is still showing the time when the system
was put to hibernation, but after about 1 minute, it gets synchronised
to the correct time (ntp kicking in?).

Now, after I hibernate the system once more and wake it up again, the
clock doesn't get updated to the correct time. It's still running
however, but it's behind. If the system stayed in hibernate for 1 hour,
the clock will be 1 hour behind.

Doing sudo hwclock --hctosys results in this:

select() to /dev/rtc to wait for clock tick timed out

I didn't dare to force a full power-on test, because I've heard some
people had to change their motherboards after that.

Hope it helps.

-- 
Ubuntu corrupts real time clock on some dell laptops
https://launchpad.net/bugs/43745