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Old 03-12-2014, 07:23 AM   #1
joboy
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Bluetooth mouse low battery problem


I am running Saucy on a Thinkpad, and I got low battery warning with the bluetooth mouse all the time, I got 2 BT mouse and changes battery but still the same problem, new battery only shows less than 20%, and will suddenly disconnect the mouse, any idea ?
 
Old 03-13-2014, 07:19 AM   #2
rtmistler
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I wasn't aware that you'd get low battery warning on the slave BT device. Just at some point the mouse stops working because the battery is too low. But not doubting you. I guess I'd research what driver was being used for that mouse and seeing if there were ways to disable settings like the equivalent of ACPI for that device, if something like that exists. I'd see if the system log contained events about this and, worst case; find the source for the driver, edit it and add debug or change it so that it didn't do that.

In looking a bit more the Bluetooth HID Profile specification talks about the requirements for support for low power link modes. The slave device can negotiate the characteristics of this mode. If the slaves do not request this mode, the host can also request/designate use of this mode. I find it hard to believe that two different mouse HID devices are misbehaving against the spec, unless they're both the same manufacturer or same interface chip. More likely is that the driver in Saucy may have a flaw where it ignores the low power mode sniff requests from the slaves and makes incorrect assumptions.

For starters, I'd try and diagnose just what is happening in Linux, what events you can find and whether or not there are options which you can configure for your Bluetooth driver. Obviously way better than trying to determine if either side's driver is adhering to the spec properly.
 
Old 03-14-2014, 11:04 AM   #3
joboy
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Ubuntu properly identify and install the driver, as far as I remember Saucy is the first version to provide battery level detail of BT device, I wonder if anyone could do a test for me with their own BT mouse, I doubt I am the only one have this problem, thanks !
 
Old 06-09-2014, 10:51 PM   #4
joboy
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I am sure this is Ubuntu to blame, I switch to OpenSuse and the same old set of battery works fine.
 
  


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