Many thanks Martin. Trawling through the linux-usb and distro kernel mailing list archives shows that the kernel blocking problem has been around for some time and discussed at length.
What it seems to boil down to is this: https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/tree/drivers/usb/core/hub.c#n67 The fact that parameters exist to force or fallback to the old initialisation scheme indicates the kernel devs. are aware there could be problems with the way USB devices are initialised, depending on the USB device. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to upower in Ubuntu. https://bugs.launchpad.net/bugs/1546641 Title: unity-settings-daemon crashed with SIGSEGV in up_exported_daemon_get_lid_is_closed() Status in Upower: Unknown Status in unity-settings-daemon package in Ubuntu: Triaged Status in upower package in Ubuntu: Fix Committed Status in unity-settings-daemon source package in Xenial: Triaged Status in upower source package in Xenial: Confirmed Status in unity-settings-daemon source package in Yakkety: Triaged Status in upower source package in Yakkety: Fix Committed Bug description: https://errors.ubuntu.com/problem/8ca9c548fc4e2fc1d4bf827bbd85c72df59313f8 Ubuntu 16.04 crashes immediately on login. Default settings not applied and appearance is a bit ugly (incorrect font hinting, in- window menus etc). --- ProblemType: Crash DistroRelease: Ubuntu 16.04 ProcVersionSignature: Ubuntu 4.4.0-6.21-generic 4.4.1 Uname: Linux 4.4.0-6-generic x86_64 ApportVersion: 2.20-0ubuntu3 Architecture: amd64 CrashCounter: 1 Date: Wed Feb 17 13:52:13 2016 ExecutablePath: /usr/lib/unity-settings-daemon/unity-settings-daemon InstallationDate: Installed on 2016-02-08 (8 days ago) InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160205) ProcCmdline: /usr/lib/unity-settings-daemon/unity-settings-daemon ProcEnviron: LANGUAGE=pt_BR:pt:en PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=pt_BR.UTF-8 SHELL=/bin/false SegvAnalysis: Segfault happened at: 0x3aae60fe69 <up_exported_daemon_get_lid_is_closed+9>: mov (%rbx),%rdi PC (0x3aae60fe69) ok source "(%rbx)" (0x00000000) not located in a known VMA region (needed readable region)! destination "%rdi" ok SegvReason: reading NULL VMA Signal: 11 SourcePackage: unity-settings-daemon StacktraceTop: up_exported_daemon_get_lid_is_closed () from /usr/lib/x86_64-linux-gnu/libupower-glib.so.3 gsd_power_manager_start () from /usr/lib/unity-settings-daemon-1.0/libpower.so ?? () from /usr/lib/unity-settings-daemon-1.0/libpower.so gnome_settings_plugin_info_activate () ?? () Title: unity-settings-daemon crashed with SIGSEGV in up_exported_daemon_get_lid_is_closed() UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: To manage notifications about this bug go to: https://bugs.launchpad.net/upower/+bug/1546641/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
