Hi ! > run: > sudo lspci -d :8c31 -vv The command yields nothing, either on AC or battery, with a USB device plugged or not. FYI, here's a 'blank' lspci: 00:00.0 Host bridge: Intel Corporation Skylake Host Bridge/DRAM Registers (rev 08) 00:02.0 VGA compatible controller: Intel Corporation HD Graphics 520 (rev 07) 00:04.0 Signal processing controller: Intel Corporation Skylake Processor Thermal Subsystem (rev 08) 00:13.0 Non-VGA unclassified device: Intel Corporation Device 9d35 (rev 21) 00:14.0 USB controller: Intel Corporation Sunrise Point-LP USB 3.0 xHCI Controller (rev 21) 00:14.2 Signal processing controller: Intel Corporation Sunrise Point-LP Thermal subsystem (rev 21) 00:15.0 Signal processing controller: Intel Corporation Sunrise Point-LP Serial IO I2C Controller #0 (rev 21) 00:16.0 Communication controller: Intel Corporation Sunrise Point-LP CSME HECI #1 (rev 21) 00:17.0 SATA controller: Intel Corporation Sunrise Point-LP SATA Controller [AHCI mode] (rev 21) 00:1c.0 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #6 (rev f1) 00:1f.0 ISA bridge: Intel Corporation Sunrise Point-LP LPC Controller (rev 21) 00:1f.2 Memory controller: Intel Corporation Sunrise Point-LP PMC (rev 21) 00:1f.3 Audio device: Intel Corporation Sunrise Point-LP HD Audio (rev 21) 00:1f.4 SMBus: Intel Corporation Sunrise Point-LP SMBus (rev 21) 01:00.0 Network controller: Intel Corporation Wireless 7265 (rev 59) > Did I understand correctly that there was nothing in dmesg if AC is > unplugged when connecting a usb device? Not even with enhanced xhci > debugging enabled? Yes, that is correct. > > Is there anything that looks suspicious in BIOS? > An option that disables wake up events for usb ports? or disables > usb ports, Energy saver support EuP/ErP? No, the only thing in the BIOS regarding USB is a security feature allowing to disable it entirely and another one regarding "legacy USB" (which, as far as I understand concerns very old USB1 devices?). Hope this helps, Pierre -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
