[Bugme-new] [Bug 12390] New: Notebook "pauses" when very idle with tickless kernel enabled
bugme-daemon at bugzilla.kernel.org
bugme-daemon at bugzilla.kernel.org
Fri Jan 9 02:08:25 PST 2009
http://bugzilla.kernel.org/show_bug.cgi?id=12390
Summary: Notebook "pauses" when very idle with tickless kernel
enabled
Product: ACPI
Version: 2.5
KernelVersion: 2.6.24.4
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Processor
AssignedTo: acpi_power-processor at kernel-bugs.osdl.org
ReportedBy: theholyettlz at googlemail.com
Latest working kernel version: Unknown
Earliest failing kernel version: 2.6.24.4 (first kernel I used on this machine)
Distribution: Fedora 8--10
Hardware Environment: x86-64, Clevo M720R notebook, Intel Core 2 Duo T8100
processor, X3100 graphics
Software Environment: x86-64 and i386
Problem Description:
My Intel Core 2 Duo T8100-based notebook seems to daydream: when left to idle
(and I mean, really idle --- so unplug/disable all USB devices and network in
order to quieten interrupts), and drop to a really low-power state, everything
seems to stop bar the interrupt handler. So, the screen "pauses" (console or X:
intel driver, X3100 hardware) and low-cpu-usage tasks stop. Hit the keyboard,
touchpad, USB device, etc., and it comes back to life as if nothing's happened.
No error messages, no crashes, no apparent corruption of anything.
Start the kernel with nohz=off, and this doesn't happen --- but then the
processor is stuck in the C0 state. Nor does it happen if the machine is kept
very busy when tickless is enabled.
Still happens with kernel 2.6.28 as far as I can see. Most often noticed during
shutdown (although sometimes during startup when udev is starting) and I have
to keep pressing the any key to get it to finish up and switch off.
Steps to reproduce:
1. Start notebook.
2. Quieten hardware, let it idle, and after a while (10-40s) the machine
"pauses".
3. Use touchpad, keyboard, etc. and machine carries on apparently without any
ill effect.
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