Public bug reported:

# lsb_release -rd
Description:    Ubuntu 14.04.3 LTS
Release:        14.04

# apt-cache policy xserver-xorg-video-nouveau
xserver-xorg-video-nouveau:
  Installé : (aucun)
  Candidat : 1:1.0.10-1ubuntu2
 Table de version :
     1:1.0.10-1ubuntu2 0
        500 http://fr.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages

# uname -a
Linux pro 4.2.0-25-generic #30~14.04.1-Ubuntu SMP Mon Jan 18 16:25:56 UTC 2016 
x86_64 x86_64 x86_64 GNU/Linux

syslog when the freeze happens

Jan 26 21:17:51 pro kernel: [   92.840280] ACPI Warning: 
\_SB_.PCI0.RP05.PXSX._DSM: Argument #4 type mismatch - Found [Buffer], ACPI 
requires [Package] (20150619/nsarguments-95)
Jan 26 21:17:51 pro kernel: [   92.840402] ACPI: \_SB_.PCI0.RP05.PXSX: failed 
to evaluate _DSM
Jan 26 21:17:51 pro kernel: [   92.840407] ACPI Warning: 
\_SB_.PCI0.RP05.PXSX._DSM: Argument #4 type mismatch - Found [Buffer], ACPI 
requires [Package] (20150619/nsarguments-95)
Jan 26 21:17:55 pro kernel: [   96.704484] nouveau E[    PBUS][0000:09:00.0] 
MMIO read of 0x00000000 FAULT at 0x122130 [ IBUS ]
Jan 26 21:17:55 pro kernel: [   96.707884] nouveau E[   PIBUS][0000:09:00.0] 
HUB0: 0x000001 0x00000001 (0xbad00100)
Jan 26 21:17:55 pro kernel: [   96.708113] nouveau E[   PIBUS][0000:09:00.0] 
ROP4: 0xbadf1100 0xbadf1100 (0xbadf1100)
Jan 26 21:17:55 pro kernel: [   96.708120] nouveau E[   PIBUS][0000:09:00.0] 
ROP6: 0xbadf1100 0xbadf1100 (0xbadf1100)
Jan 26 21:17:55 pro kernel: [   96.708127] nouveau E[   PIBUS][0000:09:00.0] 
ROP7: 0xbadf1100 0xbadf1100 (0xbadf1100)
Jan 26 21:17:55 pro kernel: [   96.708135] nouveau E[   PIBUS][0000:09:00.0] 
ROP9: 0xbadf1100 0xbadf1100 (0xbadf1100)
Jan 26 21:17:55 pro kernel: [   96.708142] nouveau E[   PIBUS][0000:09:00.0] 
ROP11: 0xbadf1100 0xbadf1100 (0xbadf1100)
Jan 26 21:17:55 pro kernel: [   96.708150] nouveau E[   PIBUS][0000:09:00.0] 
ROP12: 0xbadf1100 0xbadf1100 (0xbadf1100)
Jan 26 21:17:55 pro kernel: [   96.708162] nouveau E[   PIBUS][0000:09:00.0] 
ROP13: 0xbadf1100 0xbadf1100 (0xbadf1100)
Jan 26 21:17:55 pro kernel: [   96.708173] nouveau E[   PIBUS][0000:09:00.0] 
ROP15: 0xbadf1100 0xbadf1100 (0xbadf1100)
Jan 26 21:17:55 pro kernel: [   96.708184] nouveau E[   PIBUS][0000:09:00.0] 
GPC8: 0xbadf1100 0xbadf1100 (0xbadf1100)
Jan 26 21:17:55 pro kernel: [   96.708197] nouveau E[   PIBUS][0000:09:00.0] 
GPC20: 0x000000 0x00000000 (0x00000000)
Jan 26 21:17:55 pro kernel: [   96.708208] nouveau E[   PIBUS][0000:09:00.0] 
GPC22: 0xbadf1100 0xbadf1100 (0xbadf1100)
Jan 26 21:17:55 pro kernel: [   96.708219] nouveau E[   PIBUS][0000:09:00.0] 
GPC23: 0xbadf1100 0xbadf1100 (0xbadf1100)
Jan 26 21:17:55 pro kernel: [   96.708230] nouveau E[   PIBUS][0000:09:00.0] 
GPC25: 0xbadf1100 0xbadf1100 (0xbadf1100)
Jan 26 21:17:55 pro kernel: [   96.708241] nouveau E[   PIBUS][0000:09:00.0] 
GPC27: 0xbadf1100 0xbadf1100 (0xbadf1100)
Jan 26 21:17:55 pro kernel: [   96.708247] nouveau E[   PIBUS][0000:09:00.0] 
GPC28: 0xbadf1100 0xbadf1100 (0xbadf1100)
Jan 26 21:17:55 pro kernel: [   96.708253] nouveau E[   PIBUS][0000:09:00.0] 
GPC29: 0xbadf1100 0xbadf1100 (0xbadf1100)
Jan 26 21:17:55 pro kernel: [   96.708260] nouveau E[   PIBUS][0000:09:00.0] 
GPC31: 0x000000 0x00000000 (0x00000000)
Jan 26 21:17:55 pro kernel: [   96.708286] nouveau E[    PBUS][0000:09:00.0] 
MMIO read of 0x00000000 FAULT at 0x120058 [ IBUS TIMEOUT ]
Jan 26 21:17:55 pro kernel: [   96.708300] nouveau E[   PIBUS][0000:09:00.0] 
HUB0: 0x136928 0xbadf1100 (0x1c400200)
Jan 26 21:17:55 pro kernel: [   96.708309] nouveau E[   PIBUS][0000:09:00.0] 
ROP0: 0x10f160 0xbad00110 (0x18408201)
Jan 26 21:17:58 pro kernel: [   99.806287] nouveau E[    PBUS][0000:09:00.0] 
MMIO read of 0x00000000 FAULT at 0x132020 [ IBUS ]

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xserver-xorg-video-nouveau (not installed)
ProcVersionSignature: Ubuntu 4.2.0-25.30~14.04.1-generic 4.2.6
Uname: Linux 4.2.0-25-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
Date: Tue Jan 26 21:23:22 2016
DistUpgraded: Fresh install
DistroCodename: trusty
DistroVariant: ubuntu
DkmsStatus:
 vboxhost, 5.0.14, 3.19.0-47-generic, x86_64: installed
 vboxhost, 5.0.14, 4.2.0-25-generic, x86_64: installed
 virtualbox, 4.3.34, 3.19.0-25-generic, x86_64: installed (WARNING! Diff 
between built and installed module!) (WARNING! Diff between built and installed 
module!) (WARNING! Diff between built and installed module!)
 virtualbox, 4.3.34, 3.19.0-47-generic, x86_64: installed (WARNING! Diff 
between built and installed module!) (WARNING! Diff between built and installed 
module!) (WARNING! Diff between built and installed module!) (WARNING! Diff 
between built and installed module!)
 virtualbox, 4.3.34, 4.2.0-25-generic, x86_64: installed (WARNING! Diff between 
built and installed module!) (WARNING! Diff between built and installed 
module!) (WARNING! Diff between built and installed module!) (WARNING! Diff 
between built and installed module!)
EcryptfsInUse: Yes
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 Intel Corporation Broadwell-U Integrated Graphics [8086:1616] (rev 09) 
(prog-if 00 [VGA controller])
   Subsystem: Toshiba America Info Systems Device [1179:f840]
   Subsystem: Toshiba America Info Systems Device [1179:f842]
InstallationDate: Installed on 2016-01-25 (1 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
MachineType: TOSHIBA SATELLITE P50-C
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-25-generic 
root=UUID=6f7f2c49-ffcf-49b4-a2cb-6abeabb6e544 ro quiet splash vt.handoff=7
SourcePackage: xserver-xorg-video-nouveau
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/16/2015
dmi.bios.vendor: INSYDE Corp.
dmi.bios.version: 5.00
dmi.board.name: 06F2
dmi.board.vendor: FF50
dmi.board.version: Type2 - Board Version
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: OEM Chassis ManuFacturer
dmi.chassis.version: OEM Chassis Version
dmi.modalias: 
dmi:bvnINSYDECorp.:bvr5.00:bd07/16/2015:svnTOSHIBA:pnSATELLITEP50-C:pvrPSPTSE-0G802PFR:rvnFF50:rn06F2:rvrType2-BoardVersion:cvnOEMChassisManuFacturer:ct10:cvrOEMChassisVersion:
dmi.product.name: SATELLITE P50-C
dmi.product.version: PSPTSE-0G802PFR
dmi.sys.vendor: TOSHIBA
version.compiz: compiz 1:0.9.11.3+14.04.20150313-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.60-2~ubuntu14.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri N/A
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core N/A
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
xserver.bootTime: Tue Jan 26 21:19:31 2016
xserver.configfile: default
xserver.errors:
 Failed to load module "nvidia" (module does not exist, 0)
 Failed to load module "nvidia" (module does not exist, 0)
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id                                1136 
 vendor                                     LGD
xserver.version: 2:1.17.1-0ubuntu3.1~trusty1

** Affects: xserver-xorg-video-nouveau (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug trusty ubuntu

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https://bugs.launchpad.net/bugs/1538287

Title:
  Freeze - screen & laptop when trying toshiba p50-c-183 FN keys

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