On 2012/5/25 19:39, Josh Boyer wrote:
On Thu, May 24, 2012 at 04:48:26PM -0400, Alan Stern wrote:
On Thu, 24 May 2012, Josh Boyer wrote:
I'm testing Linus' tree as the merge window happens, and I've hit an
issue with what I believe is USB device power management (or something)
that is causing my mouse and keyboard to become unresponsive. After a
very short time of non-use, either device will cut out. I can move the
mouse around but it doesn't relay to the screen and I noticed this is
because the laser is turned off. If I click a button on it, it will
turn back on and function again until a small period of non-use. The
keyboard exhibits similar behavior, "ignoring" the first few key strokes
until it wakes back up.
I found this thread:
http://thread.gmane.org/gmane.linux.usb.general/64292
and
http://marc.info/?t=133552726500001&r=1&w=2
which have similar symptoms, but the kernels I'm using have the
subsequent patches applied. I'm doing a git bisect at the moment, with
72c04af as the starting good commit and 61011677 as the first bad. I'll
let you know what comes of this, but I thought I'd mail about it now in
case anyone has any ideas.
It sounds like you have autosuspend enabled on the mouse and keyboard,
and they don't work very well with it. Setting the sysfs power/control
attributes for the two devices to "on" will prevent autosuspend.
I don't know why this would have started happening after a kernel
upgrade. Those settings are normally controlled by userspace apps.
Let us know what you find.
OK, the bisect turned up this as the first bad commit:
54d3f8c63d6940966217b807972778fb17c3fa82 is the first bad commit
commit 54d3f8c63d6940966217b807972778fb17c3fa82
Author: Matthew Garrett<mjg@xxxxxxxxxx>
Date: Fri May 11 16:08:28 2012 +0800
usb: Set device removable state based on ACPI USB data
ACPI offers two methods that allow us to infer whether or not a USB port
is removable. The _PLD method gives us information on whether the port is
"user visible" or not. If that's not present then we can fall back to the
_UPC method which tells us whether or not a port is connectable.
Signed-off-by: Matthew Garrett<mjg@xxxxxxxxxx>
Signed-off-by: Lan Tianyu<tianyu.lan@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman<gregkh@xxxxxxxxxxxxxxxxxxx>
:040000 040000 d0845dc1e64bafbdc069d80edf1b43958e091b25 6cc92b4dd1f957d91572bbc60ebbff20e325d52f M drivers
At this point I'm not really sure what I should be poking at to figure
out what/how the power is getting turned off to the keyboard and mouse.
I can provide acpidump output, etc. Let me know what to check for and
I'll happily dig more.
hi josh:
Have you cat power/runtime_status and control under usb device sys
directory when the issue happen? We can determine which state the usb
device is in when the issue is takeing place.
josh
--
Best Regards
Tianyu Lan
linux kernel enabling team
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