HPET warning on P55 based mainboard (GA-P55A-UD5)

[Pierre Dinh-van]

I installed the 10.04 beta1 using PXE network boot from here :

http://archive.ubuntu.com/ubuntu/dists/lucid/main/installer-amd64/beta-1/images/netboot/netboot.tar.gz

If HPET is activated in the BIOS (either 32 bits or 64 bits), the kernel ouputs a warning at "hpet.c:392".

The error is the same with 32/64 bits HPET configured in bios.

It also happened during the installation. Deactivating HPET in Bios removes the warning.

[....]
[ 2.049366] NET: Registered protocol family 17
[ 2.049404] ------------[ cut here ]------------
[ 2.049409] WARNING: at /build/buildd/linux-2.6.32/arch/x86/kernel/hpet.c:392 hpet_next_event+0x7a/0x90()
[ 2.049412] Hardware name: P55A-UD5
[ 2.049413] Modules linked in:
[ 2.049416] Pid: 0, comm: swapper Not tainted 2.6.32-17-generic #26-Ubuntu
[ 2.049418] Call Trace:
[ 2.049423] [<ffffffff81066ccb>] warn_slowpath_common+0x7b/0xc0
[ 2.049427] [<ffffffff81066d24>] warn_slowpath_null+0x14/0x20
[ 2.049429] [<ffffffff810375ca>] hpet_next_event+0x7a/0x90
[ 2.049432] [<ffffffff81037610>] hpet_legacy_next_event+0x10/0x20
[ 2.049436] [<ffffffff81092cd4>] clockevents_program_event+0x54/0xa0
[ 2.049440] [<ffffffff81094228>] tick_dev_program_event+0x68/0xd0
[ 2.049443] [<ffffffff81093b5e>] tick_broadcast_oneshot_control+0x11e/0x120
[ 2.049447] [<ffffffff81093370>] tick_notify+0x130/0x200
[ 2.049451] [<ffffffff815433f6>] notifier_call_chain+0x56/0x80
[ 2.049455] [<ffffffff8108a2d6>] raw_notifier_call_chain+0x16/0x20
[ 2.049458] [<ffffffff81092af7>] clockevents_notify+0x37/0x160
[ 2.049462] [<ffffffff8130c6c1>] lapic_timer_state_broadcast+0x46/0x48
[ 2.049465] [<ffffffff8130cc30>] acpi_idle_enter_bm+0x187/0x2be
[ 2.049468] [<ffffffff815433b6>] ? notifier_call_chain+0x16/0x80
[ 2.049472] [<ffffffff81436ef7>] cpuidle_idle_call+0xa7/0x140
[ 2.049475] [<ffffffff81011e73>] cpu_idle+0xb3/0x110
[ 2.049478] [<ffffffff8153a62c>] start_secondary+0xa8/0xaa
[ 2.049483] ---[ end trace 0aa6bc0a602a2c2b ]---
[...]

I tried to run jackd (http://jackaudio.org/) with clocksource set to HPET, and it doesn't seems to have side effects. I'm not sure how I can trigger the HPET to see if it makes problems.

I'm attaching the standart outputs in next comments.

[Lukas Koranda (lkoranda)]

It looks that this is related at least to systems with Intel Core i7 family and also P55 chipsets.