Re: Time freezing on Armada E500 Laptop

On 21 June 2003 05:51, Samuel Thibault wrote:
> Hi,
> 
> This has been happening for months since I bougth my laptop: it
> sometimes seems to be frozen, and merely pressing a key unfreezes it.
> Sending chars on serial port does as well, but the USB mouse does not.
> I had a closer look and realized that the only matter was the IRQ0 not
> being generated by the pit any more... So that jiffies wouldn't
> increase, hence any program based on time would indeed freeze while
> cpu burners would still run for instance. Fancy things being the window
> manager still working, but freezing on raising a window. The system
> clock goes round within ~5s. Remote shells still work of course, since
> network generates IRQs, but sshd is frozen :/.
> 
> I tried 2.4 & 2.5, enabling / disabling APM, ACPI, speedstep, without
> any change. Flashing my bios to the latest version didn't add any option
> to the setup, it still only has a dozen, the only one related to power
> management being speedstep, which I tried to enable / disable as well.
> The Power Management program shipped by compaq for win95 won't run ("you
> need administrator rights", uh? on w95?)
> 
> Just to be sure, Linux wouldn't ever disable IRQ0, would it? Could it
> on the other hand use other timers such as the rtc for detecting this
> trouble, and even use them as fallbacks?

CMOS clock can bee used to detect this I suppose.
There is also the NMI watchdog.
--
vda