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equaeghe
Apprentice
Joined: 22 Feb 2005
Posts: 258
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 Posted: Wed Jan 16, 2013 8:21 am Post subject: fast transition D0 to D3cold power state cripples USB |
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Hi,
Recently, I think with kernel 3.6 (I use 3.6.11-gentoo), I started getting problems with my USB (Logitech radio) mouse whenever I am running off battery: it deactivates almost immediately, which means I constantly have to (literally) shake it to wake up from sleep before I can use it again. Typical mouse usage includes short periods of activity and longer periods of inactivity, so it is not as if I handle my mouse in a special way.
When looking at what happens:
| Code: | # dmesg | tail
[ 4970.857253] ehci_hcd 0000:00:1a.0: setting latency timer to 64
[ 4970.857383] ehci_hcd 0000:00:1d.0: power state changed by ACPI to D0
[ 4970.958115] ehci_hcd 0000:00:1d.0: setting latency timer to 64
[ 4970.968985] ehci_hcd 0000:00:1d.0: power state changed by ACPI to D3cold
[ 4979.335879] ehci_hcd 0000:00:1a.0: power state changed by ACPI to D3cold
[ 5389.669794] ehci_hcd 0000:00:1a.0: power state changed by ACPI to D0
[ 5389.770291] ehci_hcd 0000:00:1a.0: setting latency timer to 64
[ 5389.770531] ehci_hcd 0000:00:1d.0: power state changed by ACPI to D0
[ 5389.871161] ehci_hcd 0000:00:1d.0: setting latency timer to 64
[ 5389.881955] ehci_hcd 0000:00:1d.0: power state changed by ACPI to D3cold |
It becomes clear that USB (ehci_hcd) is switched from full power (D0) to sleep mode (D3cold) way too fast (in about a tenth of a second!).
I see different possible reasons for this behavior:
- Bug in the kernel I use.
- (Mis)configuration on my part becoming apparent after recent changes in the kernel.
I would be grateful if anyone could guide me to discover what the underlying problem is and help me find a workaround.
TIA,
Erik
Last edited by equaeghe on Tue Mar 19, 2013 12:24 pm; edited 1 time in total |
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_______0
Guru
Joined: 15 Oct 2012
Posts: 333
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| Posted: Wed Jan 16, 2013 2:04 pm Post subject: |
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is this a laptop, desktop? Configured with a kind of suspend? what's your whole dmesg output? kernel config? etc...
I have no such a messages in dmesg, so looks like and odd power management settings in kernel. |
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