[Bug 548914] [NEW] HPET warning on P55 based mainboard (GA-P55A-UD5)

[Pierre Dinh-van]

Public bug reported:

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.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

-- 
HPET warning on P55 based mainboard (GA-P55A-UD5)
https://bugs.launchpad.net/bugs/548914
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