Dell machines have lately started shipping with dual mode hardware. Most notably the i2s and hda modes. The trick is to boot with the right acpi revs and often it requires a cold boot to change mode. On Dec 5, 2015 6:31 PM, "Mick" <[email protected]> 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. > -- > Regards, > Mick >
