Laptop built-in keyboard is not working after kernel upgrade

[Robin Green]

I cannot enter my encryption password to unlock the hard drive because the keyboard does not work.

Old working kernel: 3.19.0-28-generic
Non-working kernel: 3.19.0-30-generic

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: linux-image-3.19.0-28-generic 3.19.0-28.30
ProcVersionSignature: Ubuntu 3.19.0-28.30-generic 3.19.8-ckt5
Uname: Linux 3.19.0-28-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.5
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: robin 1800 F.... pulseaudio
 /dev/snd/controlC1: robin 1800 F.... pulseaudio
CurrentDesktop: KDE
Date: Mon Oct 5 16:37:40 2015
HibernationDevice: RESUME=UUID=805a7dda-9be7-4a44-aaed-bbd91cc56268
InstallationDate: Installed on 2015-05-05 (152 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
IwConfig:
 eth0 no wireless extensions.

 lo no wireless extensions.

 tun0 no wireless extensions.
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 004: ID 0a5c:216c Broadcom Corp.
 Bus 001 Device 003: ID 04f2:b40e Chicony Electronics Co., Ltd
 Bus 001 Device 002: ID 3938:1031
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Hewlett-Packard HP Pavilion 15 Notebook PC
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-28-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro quiet splash
RelatedPackageVersions:
 linux-restricted-modules-3.19.0-28-generic N/A
 linux-backports-modules-3.19.0-28-generic N/A
 linux-firmware 1.143.3
RfKill:
 0: hci0: Bluetooth
  Soft blocked: no
  Hard blocked: no
SourcePackage: linux
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/28/2014
dmi.bios.vendor: Insyde
dmi.bios.version: F.33
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: 2293
dmi.board.vendor: Hewlett-Packard
dmi.board.version: 78.15
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnInsyde:bvrF.33:bd11/28/2014:svnHewlett-Packard:pnHPPavilion15NotebookPC:pvr0973120000405F10000620180:rvnHewlett-Packard:rn2293:rvr78.15:cvnHewlett-Packard:ct10:cvrChassisVersion:
dmi.product.name: HP Pavilion 15 Notebook PC
dmi.product.version: 0973120000405F10000620180
dmi.sys.vendor: Hewlett-Packard

[Brad Figg (brad-figg)]

This change was made by a bot.

[penalvch (penalvch)]

Robin Green, thank you for reporting this and helping make Ubuntu better. Could you please provide the full computer model as noted on the sticker of the computer itself (not from the Bug Description)?