I have a dell laptop with similar behaviours. However, I can fix it by modifying the PCI register offset 0xA4 on LPC (ex. 00:1f.0 ISA bridge).
You can use lfdk (see http://alexhungdmz.blogspot.tw/2015/06/uitlity- reading-and-writing-pci-io-and.html) to modify the PCI register. Please change BIT15 of 0xA4 (more BIT7 of 0xA5). For example, it was 0x28 and I modified it to 0xB8 (please refer to attached screenshot). This bit (called PME_B0_S5_DIS) is reset by RTCRST# (RTC reset) and normally that does not happen. It will stay as long as RTC has power or is written by again. I can also check your PCI registers if you can upload output of "sudo lspci -xxx" ** Attachment added: "pci.png" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1457852/+attachment/4446781/+files/pci.png -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1457852 Title: [Dell Optiplex 9020] Shut down causes restart if USB3 enabled To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1457852/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
