Hello, just reporting that my problem from end of June is solved. The recent update to Linux 3.16.1-1 fixed it. basti Sebastian Lipp writes:

Hi

Since yesterdays pacman -Syu I'm unable to boot my system the usual way. My observation on that is the following.

In early userspace the USB port's power gets cut for around a second which is indicated by the LED of the external drive I'm booting from. Therefore - as I further assume - recognition of the drive gets lost and decrypting and mounting of root is not possible. When I (un)plug the drive both actions get recognized as such but the device(s) don't get registered.

I already guessed and tried to

1. reinstall syslinux bootloader, 2. (realize the power cut and) downgrade kernel, 3. downgrade (lib)systemd and 4. mkinitcpio

from a chroot and reboot between each of the steps. Nothing of that helped.

I will attach a grep of my pacman.log to show which pkgs where upgraded. There were no errors logged. I will happily provide any further information that might help directing me towards debugging and fixing that problem.

Getting rid of the intermediate USB gets me rid of the described problem which is obviously no permanent solution.

Thanks a lot. basti

[2014-06-24 19:19] [PACMAN] upgraded alsa-lib (1.0.27.2-1 -> 1.0.28-1) [2014-06-24 19:19] [PACMAN] upgraded alsa-utils (1.0.27.2-1 -> 1.0.28-1) [2014-06-24 19:19] [PACMAN] upgraded bash (4.3.018-1 -> 4.3.018-3) [2014-06-24 19:19] [PACMAN] upgraded hwids (20130915.1-1 -> 20140602-1) [2014-06-24 19:19] [PACMAN] upgraded libsystemd (213-9 -> 214-2) [2014-06-24 19:19] [PACMAN] upgraded pam (1.1.8-4 -> 1.1.8-5) [2014-06-24 19:19] [PACMAN] upgraded systemd (213-9 -> 214-2) [2014-06-24 19:19] [PACMAN] upgraded libffi (3.0.13-4 -> 3.1-1) [2014-06-24 19:19] [PACMAN] upgraded llvm-libs (3.4.1-2 -> 3.4.2-1) [2014-06-24 19:19] [PACMAN] upgraded mesa (10.2.1-1 -> 10.2.1-2) [2014-06-24 19:19] [PACMAN] upgraded mesa-libgl (10.2.1-1 -> 10.2.1-2) [2014-06-24 19:19] [PACMAN] upgraded ati-dri (10.2.1-1 -> 10.2.1-2) [2014-06-24 19:19] [PACMAN] upgraded linux-firmware (20140316.dec41bc-1 -> 20140603.a4f3bc0-1) [2014-06-24 19:20] [PACMAN] upgraded linux (3.14.6-1 -> 3.15.1-1) [2014-06-24 19:20] [PACMAN] upgraded bbswitch (0.8-9 -> 0.8-11) [2014-06-24 19:20] [PACMAN] upgraded clamav (0.98.3-1 -> 0.98.4-1) [2014-06-24 19:20] [PACMAN] upgraded cmake (3.0.0-2 -> 3.0.0-3) [2014-06-24 19:20] [PACMAN] upgraded dhcpcd (6.3.2-1 -> 6.4.0-1) [2014-06-24 19:20] [PACMAN] upgraded libva (1.3.1-1 -> 1.3.1-2) [2014-06-24 19:20] [PACMAN] upgraded ffmpeg (1:2.2.3-2 -> 1:2.2.4-1) [2014-06-24 19:20] [PACMAN] upgraded file (5.18-1 -> 5.19-1) [2014-06-24 19:20] [PACMAN] upgraded filesystem (2014.06-1 -> 2014.06-2) [2014-06-24 19:20] [PACMAN] upgraded gc (7.4.0-3 -> 7.4.2-1) [2014-06-24 19:20] [PACMAN] upgraded gettext (0.18.3.2-1 -> 0.19.1-1) [2014-06-24 19:20] [PACMAN] upgraded perl (5.20.0-4 -> 5.20.0-5) [2014-06-24 19:20] [PACMAN] upgraded go (2:1.2.2-1 -> 2:1.3-1) [2014-06-24 19:20] [PACMAN] upgraded gtk-update-icon-cache (2.24.23-1 -> 2.24.24-1) [2014-06-24 19:20] [PACMAN] upgraded gtk2 (2.24.23-1 -> 2.24.24-1) [2014-06-24 19:20] [PACMAN] upgraded vim-runtime (7.4.307-4 -> 7.4.335-4) [2014-06-24 19:20] [PACMAN] upgraded gvim (7.4.307-4 -> 7.4.335-4) [2014-06-24 19:20] [PACMAN] upgraded imagemagick (6.8.9.1-3 -> 6.8.9.3-1) [2014-06-24 19:20] [PACMAN] upgraded intel-dri (10.2.1-1 -> 10.2.1-2) [2014-06-24 19:20] [PACMAN] upgraded libreoffice-de (4.2.4-2 -> 4.2.5-1) [2014-06-24 19:20] [PACMAN] upgraded libreoffice-en-GB (4.2.4-2 -> 4.2.5-1) [2014-06-24 19:20] [PACMAN] upgraded libreoffice-en-US (4.2.4-2 -> 4.2.5-1) [2014-06-24 19:20] [PACMAN] upgraded libreoffice-common (4.2.4-2 -> 4.2.5-1) [2014-06-24 19:20] [PACMAN] upgraded libreoffice-calc (4.2.4-2 -> 4.2.5-1) [2014-06-24 19:20] [PACMAN] upgraded libreoffice-writer (4.2.4-2 -> 4.2.5-1) [2014-06-24 19:20] [PACMAN] upgraded libusb (1.0.18-1 -> 1.0.19-1) [2014-06-24 19:21] [PACMAN] upgraded linux-headers (3.14.6-1 -> 3.15.1-1) [2014-06-24 19:21] [PACMAN] upgraded lirc-utils (1:0.9.0-71 -> 1:0.9.0-73) [2014-06-24 19:21] [PACMAN] upgraded man-pages (3.68-1 -> 3.69-1) [2014-06-24 19:21] [PACMAN] upgraded mdadm (3.3-2 -> 3.3.1-2) [2014-06-24 19:21] [PACMAN] upgraded netctl (1.7-1 -> 1.8-1) [2014-06-24 19:21] [PACMAN] upgraded nouveau-dri (10.2.1-1 -> 10.2.1-2) [2014-06-24 19:21] [PACMAN] upgraded python-setuptools (1:5.0.2-1 -> 1:5.2-1) [2014-06-24 19:21] [PACMAN] upgraded python2-setuptools (1:5.0.2-1 -> 1:5.2-1) [2014-06-24 19:21] [PACMAN] upgraded svga-dri (10.2.1-1 -> 10.2.1-2) [2014-06-24 19:21] [PACMAN] upgraded syslinux (6.03pre12-3 -> 6.03pre17-1) [2014-06-24 19:21] [PACMAN] upgraded systemd-sysvcompat (213-9 -> 214-2) [2014-06-24 19:21] [PACMAN] upgraded talloc (2.1.0-2 -> 2.1.1-1) [2014-06-24 19:21] [PACMAN] upgraded tzdata (2014d-1 -> 2014e-1) [2014-06-24 19:21] [PACMAN] upgraded virtualbox-host-modules (4.3.12-3 -> 4.3.12-5) [2014-06-24 19:21] [PACMAN] upgraded wine (1.7.19-2 -> 1.7.20-1) [2014-06-24 19:21] [PACMAN] upgraded xfsprogs (3.1.11-2 -> 3.2.0-1) [2014-06-24 19:21] [PACMAN] upgraded youtube-dl (2014.06.09-1 -> 2014.06.19-1) [2014-06-24 19:55] [PACMAN] upgraded pacaur (4.1.31-1 -> 4.2.3-1) [2014-06-24 19:55] [PACMAN] upgraded htop-solarized-vi (1.0.3-1 -> 1.0.3-2)