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[Dominic Chambers <dominic.chambers@xxxxxxxxx>]

That's a clever trick, being able to downgrade dependencies like that.
Any pointers on how one goes about doing it, since even if I add
'trusty' sources to `/etc/apt/sources.list' then I still only see a
single version available to install if I run `apt-show-versions xserver-
xorg`?

Anyway, great work narrowing it down so quickly!

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https://bugs.launchpad.net/bugs/1388647

Title:
  DRI_PRIME=1 has no effect in Ubuntu 14.10

Status in “xorg” package in Ubuntu:
  Confirmed

Bug description:
  On an Optimus laptop with both GPUs enabled, having run this command
  so that the Nvidia GPU can be used to offload 3D work from the Intel
  GPU:

  ```
  xrandr --setprovideroffloadsink nouveau Intel
  ```

  Then running this command:

  ```
  DRI_PRIME=1 glxinfo | grep "OpenGL vendor string"
  ```

  provides the incorrect output:

  ```
  OpenGL vendor string: Intel Open Source Technology Center
  ```

  when it should actually show that the Nouveau driver is in use for the
  program.

  This worked previously in Ubuntu 14.04. Apart from only having a 3.16
  kernel (instead of 3.17) Ubuntu 14.10 actually supports recent enough
  versions of the requisite packages necesarry to get DRI 3 offloading
  support, so perhaps this is part of the problem.

  Or, more likely, I notice a Nouveau failure after startup, and then
  again after running xrandr commands, for example:

  ```
  [  170.912483] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
  [  217.550205] thinkpad_acpi: EC reports that Thermal Table has changed
  [  223.857442] ACPI Warning: \_SB_.PCI0.PEG_.VID_._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20140424/nsarguments-95)
  [  223.858395] ACPI Warning: \_SB_.PCI0.PEG_.VID_._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20140424/nsarguments-95)
  [  223.860200] nouveau E[    PBUS][0000:01:00.0] MMIO read of 0x00000000 FAULT at 0x002140 [ !ENGINE ]
  [  224.654622] thinkpad_acpi: EC reports that Thermal Table has changed
  [  825.172094] thinkpad_acpi: EC reports that Thermal Table has changed
  [  831.132156] ACPI Warning: \_SB_.PCI0.PEG_.VID_._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20140424/nsarguments-95)
  [  831.133030] ACPI Warning: \_SB_.PCI0.PEG_.VID_._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20140424/nsarguments-95)
  [  831.134832] nouveau E[    PBUS][0000:01:00.0] MMIO read of 0x00000000 FAULT at 0x002140 [ !ENGINE ]
  ```

  Perhaps this is just a regression in either the Nouveau or Intel
  drivers for my hardware. I'm using a Lenovo T430. I can confirm that
  I'm able to start the laptop without errors when I only enable the
  Intel GPU or NVidia GPU separately, and only see this error when both
  GPUs are enabled simultaneously.

  Extra Info:

  1: Description:	Ubuntu 14.10
  Release:	14.10

  2: N/A

  3: The text 'nouveau' should have appeared in the output of the
  command.

  4: The text 'Intel' appeared in the output of the command.

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