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[Albert <sapristi@xxxxxxxxx>]

More issues related to this:

1. Once every few minutes the screen flickers.

2. Upon resume from sleep, more often than not the laptop screen is
black: not working. Switching to a tty and back to control+alt+F7
sometimes makes the screen work again. What works always, though, is to
plug in an external monitor which shows the desktop background overlaid
with a grid of dots indicative of the password screen, type in the
password blindly (fortunately the focus is by default on the password
input field, which is in the blackened laptop screen), and then move the
mouse into the other display, go to top-right and push the system menu
icon to then select the System Settings, go to Display, choose "Mirror",
and then the laptop screen works again. Of course, this workaround is
not always feasible, given that one does not carries a second monitor
around.

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https://bugs.launchpad.net/bugs/1575148

Title:
  Ubuntu 16.04 with kernel 4.4.0.21 does not recognize at all the nvidia
  card of a macbook pro 11,1

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  This macbook pro 11,1 has two cards:

  1. An nvidia card, which was both recognized in Ubuntu 14.04 with
  kernels 3.13.*, and worked well using the provided drivers under
  "Additional drivers".

  2. An intel integrated card, which was not in use under Ubuntu 14.04, but which now, under ubuntu 16.04, is the only card in use. The 'lspci' command states:
  00:02.0 VGA compatible controller [0300]: Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a2e] (rev 09)

  ... and there is no trace at all of the nvidia card under lspci.

  dmesg shows one crytic message, perhaps indicating that the nvidia
  card could not be recognized:

  [    0.190838] pci 0000:00:02.0: Video device with shadowed ROM

  dmesg lists a number of "failed" entries, such as:

  [   11.791463] usb 1-3: hub failed to enable device, error -62

  [   24.891009] wl: module verification failed: signature and/or
  required key missing - tainting kernel

  ... and also:

  [    0.190096] pci 0000:06:00.0: BAR 15: no space for [mem size 0x00200000 64bit pref]
  [    0.190098] pci 0000:06:00.0: BAR 15: failed to assign [mem size 0x00200000 64bit pref]
  [    0.190099] pci 0000:06:04.0: BAR 14: no space for [mem size 0x00200000]
  [    0.190100] pci 0000:06:04.0: BAR 14: failed to assign [mem size 0x00200000]
  [    0.190102] pci 0000:06:04.0: BAR 15: no space for [mem size 0x00200000 64bit pref]
  [    0.190103] pci 0000:06:04.0: BAR 15: failed to assign [mem size 0x00200000 64bit pref]
  [    0.190104] pci 0000:06:06.0: BAR 14: no space for [mem size 0x00200000]
  [    0.190105] pci 0000:06:06.0: BAR 14: failed to assign [mem size 0x00200000]
  [    0.190107] pci 0000:06:06.0: BAR 15: no space for [mem size 0x00200000 64bit pref]
  [    0.190108] pci 0000:06:06.0: BAR 15: failed to assign [mem size 0x00200000 64bit pref]
  [    0.190109] pci 0000:06:00.0: BAR 13: no space for [io  size 0x1000]
  [    0.190110] pci 0000:06:00.0: BAR 13: failed to assign [io  size 0x1000]
  [    0.190111] pci 0000:06:04.0: BAR 13: no space for [io  size 0x1000]
  [    0.190112] pci 0000:06:04.0: BAR 13: failed to assign [io  size 0x1000]
  [    0.190113] pci 0000:06:06.0: BAR 13: no space for [io  size 0x1000]
  [    0.190114] pci 0000:06:06.0: BAR 13: failed to assign [io  size 0x1000]
  [    0.190116] pci 0000:06:06.0: BAR 14: no space for [mem size 0x00200000]
  [    0.190117] pci 0000:06:06.0: BAR 14: failed to assign [mem size 0x00200000]
  [    0.190119] pci 0000:06:06.0: BAR 15: no space for [mem size 0x00200000 64bit pref]
  [    0.190120] pci 0000:06:06.0: BAR 15: failed to assign [mem size 0x00200000 64bit pref]
  [    0.190121] pci 0000:06:06.0: BAR 13: no space for [io  size 0x1000]
  [    0.190122] pci 0000:06:06.0: BAR 13: failed to assign [io  size 0x1000]
  [    0.190124] pci 0000:06:04.0: BAR 14: no space for [mem size 0x00200000]
  [    0.190125] pci 0000:06:04.0: BAR 14: failed to assign [mem size 0x00200000]
  [    0.190126] pci 0000:06:04.0: BAR 15: no space for [mem size 0x00200000 64bit pref]
  [    0.190127] pci 0000:06:04.0: BAR 15: failed to assign [mem size 0x00200000 64bit pref]
  [    0.190129] pci 0000:06:04.0: BAR 13: no space for [io  size 0x1000]
  [    0.190130] pci 0000:06:04.0: BAR 13: failed to assign [io  size 0x1000]
  [    0.190131] pci 0000:06:00.0: BAR 15: no space for [mem size 0x00200000 64bit pref]
  [    0.190132] pci 0000:06:00.0: BAR 15: failed to assign [mem size 0x00200000 64bit pref]
  [    0.190133] pci 0000:06:00.0: BAR 13: no space for [io  size 0x1000]
  [    0.190134] pci 0000:06:00.0: BAR 13: failed to assign [io  size 0x1000]

  
  Please let me know what further information I could provide to facilitate addressing these issues.

  Thank you.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-21-generic 4.4.0-21.37
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  albert     1695 F.... pulseaudio
   /dev/snd/controlC1:  albert     1695 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Tue Apr 26 08:02:03 2016
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-09-16 (588 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 004: ID 05ac:0259 Apple, Inc. 
   Bus 001 Device 007: ID 05ac:8289 Apple, Inc. 
   Bus 001 Device 003: ID 0a5c:4500 Broadcom Corp. BCM2046B1 USB 2.0 Hub (part of BCM2046 Bluetooth)
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Apple Inc. MacBookPro11,1
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-21-generic root=UUID=1fe82ec9-9c83-4e33-9506-2f7afb8d9d64 ro libata.force=noncq quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-21-generic N/A
   linux-backports-modules-4.4.0-21-generic  N/A
   linux-firmware                            1.157
  SourcePackage: linux
  UpgradeStatus: Upgraded to xenial on 2016-04-23 (3 days ago)
  dmi.bios.date: 02/12/2014
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBP111.88Z.0138.B07.1402121134
  dmi.board.asset.tag: Base Board Asset Tag#
  dmi.board.name: Mac-189A3D4F975D5FFC
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookPro11,1
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-189A3D4F975D5FFC
  dmi.modalias: dmi:bvnAppleInc.:bvrMBP111.88Z.0138.B07.1402121134:bd02/12/2014:svnAppleInc.:pnMacBookPro11,1:pvr1.0:rvnAppleInc.:rnMac-189A3D4F975D5FFC:rvrMacBookPro11,1:cvnAppleInc.:ct10:cvrMac-189A3D4F975D5FFC:
  dmi.product.name: MacBookPro11,1
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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