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This seems to be a similar problem to the one described here:
http://ubuntuforums.org/showthread.php?t=1829744

With recent Ubuntu versions, though, gnome-settings-daemon is not there
anymore. I tried to kill unity-settings-daemon as a workaround, but it
doesn't work.

I followed the instructions here:

https://wiki.ubuntu.com/Hotkeys/Troubleshooting

and I can correctly see the keypresses be received correctly both with
xev and with evtest

with the latter, I can see that the interesting hotkeys codes:

Event: time 1427077143.513820, -------------- SYN_REPORT ------------
Event: time 1427077143.616493, type 4 (EV_MSC), code 4 (MSC_SCAN), value ae
Event: time 1427077143.616493, type 1 (EV_KEY), code 114 (KEY_VOLUMEDOWN), value 0
Event: time 1427077143.616493, -------------- SYN_REPORT ------------
Event: time 1427077144.292461, type 4 (EV_MSC), code 4 (MSC_SCAN), value b0
Event: time 1427077144.292461, type 1 (EV_KEY), code 115 (KEY_VOLUMEUP), value 1

And the events can be seen even when the volume hotkeys are unresponsive
(the volume is not updated).

This seems to happen more often (or at least it's more noticeable to me)
when watching something in fullscreen.

Keypresses usually aren't lost, but are simply delayed and buffered, and
thus if I press the button 5/10 times, after half a minute of so, all
the keypresses will trigger the corresponding action all together

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: udev 208-8ubuntu8.2
ProcVersionSignature: Ubuntu 3.16.0-31.43-generic 3.16.7-ckt5
Uname: Linux 3.16.0-31-generic x86_64
ApportVersion: 2.14.7-0ubuntu8.2
Architecture: amd64
CurrentDesktop: Unity
CustomUdevRuleFiles: 80-docker.rules
Date: Mon Mar 23 02:07:48 2015
EcryptfsInUse: Yes
InstallationDate: Installed on 2014-08-17 (217 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
MachineType: LENOVO 20AQCTO1WW
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-31-generic.efi.signed root=UUID=259bbe5f-d5f2-42de-89f9-58a9d77e4a21 ro quiet splash vt.handoff=7
SourcePackage: systemd
UpgradeStatus: Upgraded to utopic on 2014-10-16 (157 days ago)
dmi.bios.date: 05/20/2014
dmi.bios.vendor: LENOVO
dmi.bios.version: GJET77WW (2.27 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20AQCTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: SDK0E50512 STD
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvrGJET77WW(2.27):bd05/20/2014:svnLENOVO:pn20AQCTO1WW:pvrThinkPadT440s:rvnLENOVO:rn20AQCTO1WW:rvrSDK0E50512STD:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 20AQCTO1WW
dmi.product.version: ThinkPad T440s
dmi.sys.vendor: LENOVO

** Affects: unity-settings-daemon (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: amd64 apport-bug utopic
-- 
Volume hotkeys stop working (dozens of seconds of delay)
https://bugs.launchpad.net/bugs/1435108
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