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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.
** Affects: xorg (Ubuntu)
Importance: Undecided
Status: New
** Tags: bot-comment
--
DRI_PRIME=1 has no effect in Ubuntu 14.10
https://bugs.launchpad.net/bugs/1388647
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