Public bug reported:

[    3.813968] ------------[ cut here ]------------
[    3.814009] WARNING: CPU: 1 PID: 64 at 
/build/linux-o309rM/linux-4.8.0/drivers/gpu/drm/i915/intel_pm.c:7866 
sandybridge_pcode_write+0x109/0x1f0 [i915]
[    3.814011] Missing switch case (16) in gen6_check_mailbox_status
[    3.814012] Modules linked in: hid_generic usbhid hid sd_mod i915 ahci 
libahci libata i2c_algo_bit xhci_pci drm_kms_helper xhci_hcd syscopyarea 
sysfillrect ehci_pci scsi_mod sysimgblt ehci_hcd r8169 crc32c_intel usbcore 
fb_sys_fops psmouse mii drm usb_common thermal fan wmi video fjes button
[    3.814039] CPU: 1 PID: 64 Comm: kworker/1:1 Not tainted 4.8.0-11-generic 
#12-Ubuntu
[    3.814040] Hardware name: SAMSUNG ELECTRONICS CO., LTD. 
530U3C/530U4C/SAMSUNG_NP1234567890, BIOS P14AAJ 04/15/2013
[    3.814067] Workqueue: events intel_gen6_powersave_work [i915]
[    3.814070]  0000000000000286 00000000cd9c6c75 ffffffffa2758d54 
ffff992d49437d58
[    3.814073]  0000000000000000 ffffffffa247f73e ffff992d48860000 
ffff992d49437db0
[    3.814076]  0000000000000000 ffff992d4886a438 ffff992d48868830 
ffff992d4886a378
[    3.814080] Call Trace:
[    3.814085]  [<ffffffffa2758d54>] ? dump_stack+0x5c/0x78
[    3.814089]  [<ffffffffa247f73e>] ? __warn+0xbe/0xe0
[    3.814092]  [<ffffffffa247f7bf>] ? warn_slowpath_fmt+0x5f/0x80
[    3.814117]  [<ffffffffc0360179>] ? sandybridge_pcode_write+0x109/0x1f0 
[i915]
[    3.814141]  [<ffffffffc0361b48>] ? intel_gen6_powersave_work+0x2b8/0x1430 
[i915]
[    3.814144]  [<ffffffffa2498cc4>] ? process_one_work+0x184/0x4b0
[    3.814146]  [<ffffffffa249903d>] ? worker_thread+0x4d/0x480
[    3.814149]  [<ffffffffa2a318b1>] ? __schedule+0x261/0x720
[    3.814150]  [<ffffffffa2498ff0>] ? process_one_work+0x4b0/0x4b0
[    3.814153]  [<ffffffffa249f1dd>] ? kthread+0xcd/0xf0
[    3.814156]  [<ffffffffa242c751>] ? __switch_to+0x2c1/0x7a0
[    3.814160]  [<ffffffffa2a3641f>] ? ret_from_fork+0x1f/0x40
[    3.814163]  [<ffffffffa249f110>] ? kthread_create_on_node+0x1e0/0x1e0
[    3.814165] ---[ end trace 651481f7d7d24a72 ]---

ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: linux-image-4.8.0-11-generic 4.8.0-11.12
ProcVersionSignature: Ubuntu 4.8.0-11.12-generic 4.8.0-rc6
Uname: Linux 4.8.0-11-generic x86_64
ApportVersion: 2.20.3-0ubuntu7
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/pcmC0D0p:   caravena   2026 F...m pulseaudio
 /dev/snd/controlC0:  caravena   2026 F.... pulseaudio
CurrentDesktop: GNOME
Date: Wed Sep 21 16:54:32 2016
HibernationDevice: RESUME=UUID=360bd2d2-4f44-4311-86d6-4781ac81ee87
InstallationDate: Installed on 2015-07-26 (423 days ago)
InstallationMedia: Ubuntu-GNOME 15.10 "Wily Werewolf" - Alpha amd64 (20150723)
MachineType: SAMSUNG ELECTRONICS CO., LTD. 530U3C/530U4C
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.8.0-11-generic 
root=UUID=4f4435ca-b877-47a5-9065-3dd624c0514e ro rootflags=subvol=@ quiet 
splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-4.8.0-11-generic N/A
 linux-backports-modules-4.8.0-11-generic  N/A
 linux-firmware                            1.161
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/15/2013
dmi.bios.vendor: Phoenix Technologies Ltd.
dmi.bios.version: P14AAJ
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: SAMSUNG_NP1234567890
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: FAB1
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.version: 0.1
dmi.modalias: 
dmi:bvnPhoenixTechnologiesLtd.:bvrP14AAJ:bd04/15/2013:svnSAMSUNGELECTRONICSCO.,LTD.:pn530U3C/530U4C:pvr0.1:rvnSAMSUNGELECTRONICSCO.,LTD.:rnSAMSUNG_NP1234567890:rvrFAB1:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvr0.1:
dmi.product.name: 530U3C/530U4C
dmi.product.version: 0.1
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

** Affects: linux
     Importance: Unknown
         Status: Unknown

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug yakkety

** Bug watch added: freedesktop.org Bugzilla #97826
   https://bugs.freedesktop.org/show_bug.cgi?id=97826

** Also affects: linux via
   https://bugs.freedesktop.org/show_bug.cgi?id=97826
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/1626255

Title:
  WARNING: CPU: 1 PID: 64 at /build/linux-
  o309rM/linux-4.8.0/drivers/gpu/drm/i915/intel_pm.c:7866
  sandybridge_pcode_write+0x109/0x1f0 [i915]

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