On Sunday 06 Dec 2015 07:22:37 Alan McKinnon wrote: > On 06/12/2015 01:31, Mick wrote: > > I came across a rather peculiar phenomenon today with my laptop. I > > realised that my bluetooth controller was nowhere to be found. I > > thought running hciconfig would bring it up, but all it did was to > > complain that there was no device found. rfkill would not list it > > either. > > > > Modprobing various modules did not produce a device, so searching for > > answers I thought of booting into MSWindows. After I enabled the device > > in MSWindows I rebooted into Linux and was surprised to see the > > bluetooth controller was visible again in lspci. > > > > How come that switching off the device in one OS, affects the other? :-/ > > > > What should I do next time to enable bluetooth from within Linux? > > > > > > PS. There's a parallel to this with the same laptop. Some years ago > > audio would randomly never come up at boot and no amount of alsactl > > could wake it up. A swift reboot into MSWindows would reset audio and > > all would work fine in Linux thereafter. Some cursory troubleshooting > > at the time didn't help me much. I don't expect that the two issues are > > related, but thought of mentioning it just in case. > > We've had a few cases of things like this on the list over the years. It > always end up probably a Linux driver bug. Here's what seems to happen: > > The hardware needs to be enabled/shutdown/fiddled or whatever in some > magic way that windows knows about but linux doesn't. Booting into > Windows applies the magic so when you reboot into Linux it's now in a > state Linux can use.
Yes, this makes sense. The hickups with the audio would always happen when I booted on battery, so I thought at the time that they were related to Linux's power management. > Read the kernel docs for your driver, the odds are good you have to > apply a driver tweak for your hardware to make it work right. I have had a look at the Doc but haven't been able to find anything. This is my device: Bus 002 Device 008: ID 413c:8156 Dell Computer Corp. Wireless 370 Bluetooth Mini-card Bus 002 Device 005: ID 0a5c:4500 Broadcom Corp. BCM2046B1 USB 2.0 Hub (part of BCM2046 Bluetooth) > Then do a Google search for your hardware and laptop types, see what the > interwebz have to say. I came across this bug report, although not directly relevant to my symptoms: https://bugzilla.kernel.org/show_bug.cgi?id=47231 There are loads of Ubuntu users reporting that their bluetooth is nowhere to be seen, but I didn't find any solutions there. -- Regards, Mick
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