Bug 362 - When power is unplugged, some USB devices are not powered
Summary: When power is unplugged, some USB devices are not powered
Status: RESOLVED FIXED
Alias: None
Product: Mageia
Classification: Unclassified
Component: RPM Packages (show other bugs)
Version: Cauldron
Hardware: i586 Linux
Priority: Normal critical
Target Milestone: ---
Assignee: Mageia Bug Squad
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Reported: 2011-03-13 20:26 CET by Lucien XU
Modified: 2011-04-30 16:03 CEST (History)
1 user (show)

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Source RPM: kernel
CVE:
Status comment:

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Description Lucien XU 2011-03-13 20:26:46 CET 
Description of problem:
On a laptop, when I unplug the alimentation source, my USB mouse is not power powered anymore and cannot be used, but my USB key (USB disk) is still powered.

It seems to be related to laptop mode and not KDE power devil configuration because when I go on "powersave" mode, with the alimentation source plugged, the mouse is still usable.

When the power supply is plugged, the mouse is then powered and can be used.

Version-Release number of selected component (if applicable):
KDE 4.6.1 laptop-mode-tools 1.57

How reproducible:
Every time


Steps to Reproduce:
1. Plug an USB mouse (it should be usable)
2. Unplug the power supply (KDE should notify that)
3. Try to use the mouse : it is not working
4. Plug the power source
5. The mouse works again !


Reproducible: 

Steps to Reproduce:
Comment 1 Lucien XU 2011-04-03 23:01:54 CEST 
Sorry, but I still experience this bug (with latest kernel and updates)
It can be very annoying in final, so I increase the severity to critical.

Severity: major => critical

Comment 2 Lucien XU 2011-04-22 20:53:53 CEST 
I have edited /etc/laptop-mode/conf.d/usb-autosuspend.conf
With CONTROL_USB_AUTOSUSPEND=0 in order to let my USB device work without power.

It was set to "auto" before.
I don't know if it is a bug of a feature, but my bug is now resolved.
Closing

Status: NEW => RESOLVED
Resolution: (none) => WORKSFORME

Ahmad Samir 2011-04-23 00:19:08 CEST

Source RPM: (none) => laptop-mode-tools

Comment 3 Ahmad Samir 2011-04-23 00:28:07 CEST 
A bug according to pterjan. So reopening.

Status: RESOLVED => REOPENED
Resolution: WORKSFORME => (none)

Ahmad Samir 2011-04-23 00:33:10 CEST

Source RPM: laptop-mode-tools => kernel

Comment 4 Pascal Terjan 2011-04-23 00:34:17 CEST 
When the mouse no longer work, does clicking help (in case you only tried moving it)?

CC: (none) => pterjan

Comment 5 Pascal Terjan 2011-04-23 00:36:49 CEST 
I found http://code.google.com/p/chromium-os/issues/detail?id=4534 where they decided to not autosuspend input devices as too many behave badly
Comment 6 Lucien XU 2011-04-23 11:25:35 CEST 
I set the "default" parameter again and when clicking on the mouse it works again.
Since it is an optical mouse, moving it when unpowered might does not have any effect ...

I don't know if it is wise to keep this "click-to-wake-up" behaviour : it can make some troubles.
Comment 7 Ahmad Samir 2011-04-23 19:47:33 CEST 
(In reply to comment #6)
[...]
> I don't know if it is wise to keep this "click-to-wake-up" behaviour : it can
> make some troubles.

Maybe; but it indeed saves some power, right?
Comment 8 Lucien XU 2011-04-23 21:35:37 CEST 
Ok, bad news from laptop-mode front : 
When I click to power the mouse, the red LED starts glowing but it is not functionnal. So my mouse is unusable ...
Comment 9 Pascal Terjan 2011-04-30 16:03:31 CEST 
I added a patch to disable autosuspend for input devices

Status: REOPENED => RESOLVED
Resolution: (none) => FIXED
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