Debian as well as everyone else  2.6.18-5
 
Zaptel is branch/1.4 latest.
 
The issue is not with Zaptel though...IMHO.  If you look at /proc/driver/rtc, I find:
rtc_time    : 14:34:27
rtc_date    : 2007-11-12
rtc_epoch    : 1900
alarm        : 16:30:31
DST_enable    : no
BCD        : yes
24hr        : yes
square_wave    : no
alarm_IRQ    : no
update_IRQ    : no
periodic_IRQ    : no
periodic_freq    : 1024
batt_status    : okay
 
If you notice, there is no periodic_IRQ.  That is the issue.  To me (and the kernels reported here) it is a Debian kernel problem.
 
If I turn off ACPI, Zaptel works, but the box performance is awful because other things, which depend on ACPI do not have interrupts.
 
I have read some places that if you have the Hard Drive Suppend in the BIOS enabled, you will get this situation.  However, I would check the /proc/driver/rtc to see that you have periodic_IRQ.

> On Fri, Nov 09, 2007 at 04:59:37PM -0600, Tony Plack wrote:
>
>> The thing is that this works, but....
>>
>> The performance of the box becomes really bad.
>>
>> It seems that the problem, at least in my case is that the HPET
>> timer from the cpu does not get an IRQ for the RTC.
>>
>> Does anyone else have a solution for this issue where the RTC
>> does not get an interrupt when HPET is turned on?
>>
> What kerenl version? What version of Zaptel?
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