https://bugzilla.kernel.org/show_bug.cgi?id=198953 Bug ID: 198953 Summary: hci_bcm: Streamline runtime PM code change for 4.16 kernel breaks bluetooth on ASUS T100TA Product: Drivers Version: 2.5 Kernel Version: 4.16-rc3 Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: Bluetooth Assignee: linux-bluetooth@xxxxxxxxxxxxxxx Reporter: rhowell@xxxxxxxx Regression: No Created attachment 274481 --> https://bugzilla.kernel.org/attachment.cgi?id=274481&action=edit Patch to add ASUS T100TAM and Toshiba Encore device info to hci_bcm.c The patch "Bluetooth: hci_bcm: Streamline runtime PM code" by Lukas Wunner, posted at <https://www.spinics.net/lists/linux-bluetooth/msg73529.html>, and incorporated in 4.16-rc3 (and probably rc1 and 2) breaks bluetooth on the ASUS T100TA, T100TAM, and Toshiba Encore computers. All are Baytrail machines. Reverting that single patch fixes the problem. Bluetooth comes up OK initially, but after about 5 seconds of use seems to die. Turning power to the bluetooth controller off then on, either in bluetoothctl or in via a system GUI, fixes the problem for about another 5 seconds, but then bluetooth dies again. The problem happens both with a Logitech MX2 mouse and a bluetooth keyboard. No error messages seem to be produced in dmesg or elsewhere, but the system stops responding to the mouse or keyboard. I've also experimented with reverting the series of 13 later patches also be Lukas Wunner posted at <https://www.spinics.net/lists/linux-bluetooth/msg73757.html> but those do NOT seem to have any effect one way or the other on the problem. The single critical patch is the one listed above, and luckily it can be reverted independently of the other 13. While bluetooth has been working (before 4.16) on the T100TA with the stock kernel, to make it work for the T100TAM and the Encore I've always needed to add them to the device quirk table (which already includes the T100TA), and for the Encore I need to add the BCM2E38 device ID to the ACPI table. I've attached a patch which adds that T100TAM and Encore information. If there is any way it could be incorporated in the mainline code, that would be great. In any case, you'll need to apply it to the 4.16-rc3 stock hci_bcm.c file if you do want to test for this bug with the T100TAM or the Encore. You don't need it to test with the T100TA. -- You are receiving this mail because: You are the assignee for the bug.-- To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
