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[Uli Köhler <1567781@xxxxxxxxxxxxxxxxxx>]

I faced the same issue with an embedded LEX 2I260D-H26 on Ubuntu 16.04
both in kernels 4.6. I faced an issue where (when not blacklisting the
gma500_gfx driver via /etc/modprobe.d/blacklist.conf), the HDMI screen
would stay black, unless the HDMI cable was NOT plugged in during boot
in which case I could connect HDMI after startup and then restart the
display manager.

Also, the setup worked perfectly fine on a 1280x720 monitor (which does
not support Full HD), but displayed the abovementioned failure modes in
Full HD. I don't know if the dmesg error message also appears on the
1280x720 monitor, but it appeared if and only if the HDMI stayed black.

I have solved this issue in Kernel 4.6 mainline (I have not tried with other kernels so far, but I will try with 4.4 in the next few weeks) by applying the following settings in "VGA setting" in the BIOS:
On-Chip Frame Buffer Size := 64 MB (default: 8 MB)
Total GFX Memory := 256 MB (default: 128 MB)

I have not checked if any of those settings individually solve the
issue. In any case, however, I believe it might be an issue with lack of
memory, possibly either in the driver or in the firmware. It might also
be related to a memory overflow/use-after-free etc that is triggered by
the lack of memory.

My recommended procedure to fix the issue on your hardware is to go into
your BIOS and increase all memory settings for the embedded graphics
until the problem disappears.

I hope this information can help you debug it in your system.

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https://bugs.launchpad.net/bugs/1567781

Title:
  unable to handle kernel NULL pointer dereference at 00000134

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Problem is found in dmesg output:
  [   11.660671] BUG: unable to handle kernel NULL pointer dereference at 00000134
  [   11.660688] IP: [<c17692b2>] mutex_lock+0x12/0x30
  [   11.660706] *pdpt = 0000000033ee5001 *pde = 0000000000000000
  [   11.660714] Oops: 0002 [#1] SMP
  [   11.660723] Modules linked in: nfsd auth_rpcgss nfs_acl lockd parport_pc grace ppdev lp sunrpc parport autofs4 hid_generic hid_cherry pata_acpi usbhid hid psmouse gma500_gfx i2c_algo_bit r8169 drm_kms_helper drm sdhci_pci pata_sch sdhci mii video
  [   11.660772] CPU: 1 PID: 242 Comm: plymouthd Not tainted 4.2.0-35-generic #40-Ubuntu
  [   11.660779] Hardware name: CompuLab CM-iAM/SBC-FITPC2i/CM-iAM/SBC-FITPC2i, BIOS NAPA0001.86C.0000.D.1009141059 09/14/2010
  [   11.660785] task: f5cf08c0 ti: f2364000 task.ti: f2364000
  [   11.660792] EIP: 0060:[<c17692b2>] EFLAGS: 00010286 CPU: 1
  [   11.660798] EIP is at mutex_lock+0x12/0x30
  [   11.660804] EAX: 00000134 EBX: 00000134 ECX: 00000000 EDX: 80000000
  [   11.660810] ESI: 00000000 EDI: 00000000 EBP: f2365ea8 ESP: f2365ea4
  [   11.660815]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
  [   11.660820] CR0: 80050033 CR2: 00000134 CR3: 31a1d540 CR4: 000006f0
  [   11.660824] Stack:
  [   11.660828]  f19f93a0 f2365ec0 f8586171 f326dea0 f1ad7000 00000000 f1a0a400 f2365ec8
  [   11.660842]  f858621f f2365edc f845ff47 f1a0a400 f1a0a400 f1a0a400 f2365eec f84b6019
  [   11.660856]  f2365f04 c11b2de4 f2365f04 f856a78a f74d59d0 00000000 00000000 f1a0a400
  [   11.660869] Call Trace:
  [   11.660935]  [<f8586171>] __drm_modeset_lock_all+0x91/0x130 [drm]
  [   11.660986]  [<f858621f>] drm_modeset_lock_all+0xf/0x30 [drm]
  [   11.661018]  [<f845ff47>] drm_fb_helper_restore_fbdev_mode_unlocked+0x17/0x50 [drm_kms_helper]
  [   11.661048]  [<f84b6019>] psb_driver_lastclose+0x19/0x50 [gma500_gfx]
  [   11.661060]  [<c11b2de4>] ? kfree+0x134/0x140
  [   11.661110]  [<f856a78a>] drm_lastclose+0x2a/0x140 [drm]
  [   11.661159]  [<f856ab3f>] drm_release+0x29f/0x490 [drm]
  [   11.661170]  [<c11cd0af>] __fput+0xcf/0x210
  [   11.661179]  [<c11cd22d>] ____fput+0xd/0x10
  [   11.661189]  [<c10869af>] task_work_run+0x7f/0xa0
  [   11.661200]  [<c1012035>] do_notify_resume+0x75/0x80
  [   11.661209]  [<c176bbcb>] work_notifysig+0x16/0x1b
  [   11.661215] Code: 00 00 c3 8d b6 00 00 00 00 31 c0 5d c3 8d b6 00 00 00 00 8d bf 00 00 00 00 55 89 e5 53 3e 8d 74 26 00 89 c3 e8 60 ef ff ff 89 d8 <f0> ff 08 79 05 e8 74 07 00 00 64 a1 c8 c0 bf c1 89 43 10 5b 5d
  [   11.661311] EIP: [<c17692b2>] mutex_lock+0x12/0x30 SS:ESP 0068:f2365ea4
  [   11.661323] CR2: 0000000000000134
  [   11.661332] ---[ end trace 3bb80835d39a3e44 ]---

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-35-generic 4.2.0-35.40
  ProcVersionSignature: Ubuntu 4.2.0-35.40-generic 4.2.8-ckt5
  Uname: Linux 4.2.0-35-generic i686
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: i386
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D2c', '/dev/snd/pcmC0D1p', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/controlC0', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  Date: Fri Apr  8 08:21:26 2016
  HibernationDevice: RESUME=UUID=fda9b258-61a9-4bc5-974e-738538cee628
  InstallationDate: Installed on 2013-07-09 (1003 days ago)
  InstallationMedia: Lubuntu 13.04 "Raring Ringtail" - Release i386 (20130423.1)
  MachineType: CompuLab CM-iAM/SBC-FITPC2i
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-35-generic root=UUID=41b7698f-f3fa-4940-8e13-9378c5021e90 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-35-generic N/A
   linux-backports-modules-4.2.0-35-generic  N/A
   linux-firmware                            1.149.3
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: yes
   	Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: Upgraded to wily on 2015-12-23 (106 days ago)
  dmi.bios.date: 09/14/2010
  dmi.bios.vendor: Phoenix Technologies LTD
  dmi.bios.version: NAPA0001.86C.0000.D.1009141059
  dmi.board.name: CM-iAM/SBC-FITPC2i
  dmi.board.vendor: Intel Corporation
  dmi.board.version: 1.x
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 1
  dmi.chassis.vendor: OEM
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvrNAPA0001.86C.0000.D.1009141059:bd09/14/2010:svnCompuLab:pnCM-iAM/SBC-FITPC2i:pvrNotApplicable:rvnIntelCorporation:rnCM-iAM/SBC-FITPC2i:rvr1.x:cvnOEM:ct1:cvrN/A:
  dmi.product.name: CM-iAM/SBC-FITPC2i
  dmi.product.version: Not Applicable
  dmi.sys.vendor: CompuLab

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