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[Marco Trevisan (Treviño) <mail@xxxxxxxxx>]

Also, i've been running trusty in a very similar laptop to the one I
used for this report (same CPU/Chipset) but using a slightly different
video card, instead: G86M [GeForce 8600M GS].

And that works.

I've noticed they have a different bios version, though:
 - Not working: v1.3804
 - Working: v1.3804

So, I've upgrade this laptop bios to version v1.3818, and magically
things work now.

Then, while I think we're still somewhat regressing in handling that
old-configured-hw, Acer 5920G users should know that they need to
upgrade their bios to have trusty properly running.

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https://bugs.launchpad.net/bugs/1310406

Title:
  [regression] Trusty kernel doesn't recognize GeForce 8600m GT nor with
  nouveau or nvidia drivers

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  When loading trusty (also from a brand new live-USB) in an Acer Aspire 5920G, that has a Nvidia 8600m GT card, the nouveau driver fails to load and the UI falls back to llvmpipe.
  Using noacpi kernel cmdline doesn't help.

  The highlights from dmesg are:

  [   20.051842] nouveau 0000:01:00.0: enabling device (0004 -> 0007)
  [   20.052191] [drm] hdmi device  not found 1 0 1
  [   20.052340] nouveau E[  DEVICE][0000:01:00.0] unknown chipset, 0xffffffff
  [   20.052346] nouveau E[     DRM] failed to create 0x80000080, -22
  [   20.052540] nouveau: probe of 0000:01:00.0 failed with error -22

  Installing the Nvidia drivers 331 or current (304) gives out a similar
  error when loading the nvidia kernel module:

  [   18.405583] nvidia: module license 'NVIDIA' taints kernel.
  [   18.405588] Disabling lock debugging due to kernel taint
  [   18.418853] nvidia: module verification failed: signature and/or  required key missing - tainting kernel
  [   18.426016] nvidia 0000:01:00.0: enabling device (0000 -> 0003)
  [   18.426115] vgaarb: device changed decodes: PCI:0000:01:00.0,olddecodes=io+mem,decodes=none:owns=none
  [   18.426161] NVRM: The NVIDIA GPU 0000:01:00.0 (PCI ID: 10de:0407)
  [   18.426161] NVRM: installed in this system is not supported by the 331.38
  [   18.426161] NVRM: NVIDIA Linux driver release.  Please see 'Appendix
  [   18.426161] NVRM: A - Supported NVIDIA GPU Products' in this release's
  [   18.426161] NVRM: README, available on the Linux driver download page
  [   18.426161] NVRM: at www.nvidia.com.
  [   18.426215] nvidia: probe of 0000:01:00.0 failed with error -1
  [   18.426869] NVRM: The NVIDIA probe routine failed for 1 device(s).
  [   18.426872] NVRM: None of the NVIDIA graphics adapters were initialized!
  [   18.426874] [drm] Module unloaded
  [   18.426982] NVRM: NVIDIA init module failed!

  /var/log/gpu-manager.log: http://paste.ubuntu.com/7286246/
  nvidia-bug-report.sh (contains full dmesg and Xorg.log): http://paste.ubuntu.com/7287180/

  Fun fact is that the card is supported by the latest nvidia drivers as reported by their appendix [1].
  Also they used to work in 12.04.

  So, I've manually installed the saucy kernel, and with it both nouveau and nvidia modules are loaded properly, making X to load the proper driver and GLX to work.
  Everything works also using the daily mainline kernel linux-image-3.15.0-999-generic_3.15.0-999.201404190220_amd64.deb.
  Thus this seems to indicate pretty clearly that the bug is inside the trusty linux kernel itself.

  [1] ftp://download.nvidia.com/XFree86/Linux-
  x86_64/331.38/README/supportedchips.html

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-24-generic 3.13.0-24.46
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  luca       1967 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Mon Apr 21 00:20:42 2014
  HibernationDevice: RESUME=UUID=375bbd5e-c25c-4d6e-bfa4-66bed5e80cb0
  InstallationDate: Installed on 2011-12-28 (844 days ago)
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  MachineType: Acer, inc. Aspire 5920G
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=d9d0e5ab-b408-439e-ae8b-c2bf704713bf ro quiet splash vt.handoff=7 noacpi
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-24-generic N/A
   linux-backports-modules-3.13.0-24-generic  N/A
   linux-firmware                             1.127
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2014-04-19 (1 days ago)
  dmi.bios.date: 08/15/2007
  dmi.bios.vendor: Acer
  dmi.bios.version: v1.3708
  dmi.board.name: Chapala
  dmi.board.vendor: Acer, Inc.
  dmi.board.version: Not Applicable
  dmi.chassis.type: 1
  dmi.chassis.vendor: Acer, Inc.
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnAcer:bvrv1.3708:bd08/15/2007:svnAcer,inc.:pnAspire5920G:pvrNotApplicable:rvnAcer,Inc.:rnChapala:rvrNotApplicable:cvnAcer,Inc.:ct1:cvrN/A:
  dmi.product.name: Aspire 5920G
  dmi.product.version: Not Applicable
  dmi.sys.vendor: Acer, inc.

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