Volume shortcuts stopped working, and other strangeness

[Aaron Paden <aaronbpaden gmail com>]

I'm running Arch Linux with testing, mesa-git and linux-mainline, and
I ran into an issue last night with an update. I'm not sure what might
have caused it, because gnome-shell hasn't been updated since Aug. 22
and is currently at 3.20.4.

I don't have media keys on my keyboard, so I have keyboard shorcuts
setup as super++ and super+- for volume up/down. I've had these
shortcuts basically forever, and they have always worked. Now, that's
not the case. It doesn't appear to be an issue with the specific
shortcuts. I can use the other super combo shortcuts just fine. If I
change the volume up/down shortcuts, they still don't work, so it's
specifically an issue with changing the volume via shortcut. I'm not
seeing anything jump out at me in the journal.

So I go into the menu on the top right to change my volume, and I
notice a brightness slider. I don't use that menu often, so I may be
misremembering, but I don't think it was there before. This is a
desktop machine, so brightness controls are on the display. The slider
is all the way down, and of course moving the slider has no effects
except printing a timeout error in the journal.

I thought maybe my settings got messed up somehow, so I tried trashing
dconf/gconf, but that had no effect (other than me having to reset all
of my settings, as expected).

I'm appending a list of packages in the last round of upgrades just in
case something jumps out to anyone on the list. Note that I usually
use linux-mainline, but switching to the default kernel has no effect.

appstream (0.10.0-2 -> 0.10.1-2)
shared-mime-info (1.6-2 -> 1.7-1)
llvm-libs-svn (281489-1 -> 281655-1)
mesa-git (84933.f019255-1 -> 84947.111f6b2-1)
mesa-libgl-git (84933.f019255-1 -> 84947.111f6b2-1)
calibre (2.67.0-1 -> 2.68.0-1)
llvm-svn (281489-1 -> 281655-1)
clang-svn (281489-1 -> 281655-1)
clang-tools-extra-svn (281489-1 -> 281655-1)
libcups (2.1.4-2 -> 2.2.0-1)
cups-filters (1.11.2-1 -> 1.11.3-1)
cups (2.1.4-2 -> 2.2.0-1)
jansson (2.7-1 -> 2.8-1)
lib32-gst-plugins-base-libs (1.8.2-1 -> 1.8.3-1)
lib32-llvm-libs-svn (281503-1 -> 281674-1)
lib32-mesa-git (84933.f019255-1 -> 84948.9fec15a-1)
lib32-mesa-libgl-git (84933.f019255-1 -> 84948.9fec15a-1)
lib32-gst-plugins-base (1.8.2-1 -> 1.8.3-1)
lib32-gst-plugins-good (1.8.2-2 -> 1.8.3-1)
lib32-llvm-svn (281503-1 -> 281674-1)
lib32-tdb (1.3.9-1 -> 1.3.11-1)
libclc-git (326.201609141728-1 -> 330.201609152244-1)
linux (4.7.3-2 -> 4.7.4-1)
linux-headers (4.7.3-2 -> 4.7.4-1)
llvm-ocaml-svn (281489-1 -> 281655-1)
nodejs (6.5.0-1 -> 6.6.0-1)
opencl-mesa-git (84933.f019255-1 -> 84947.111f6b2-1)
pinentry (0.9.7-2 -> 0.9.7-3)
python2-twisted (16.3.2-1 -> 16.4.1-1)
spice-protocol (0.12.11-1 -> 0.12.12-1)
vulkan-intel-git (84933.f019255-1 -> 84947.111f6b2-1)
vulkan-radeon-git (85356.c5cb80d-1 -> 85359.b5fee99-1)
xf86-video-amdgpu-git (225.0f8df85-1 -> 227.aa8a3fa-1)
xf86-video-ati-git (3348.cc25558-1 -> 3352.12d30ee-1)
youtube-dl (2016.09.11.1-1 -> 2016.09.15-1)