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[Michał Lech <700646@xxxxxxxxxxxxxxxxxx>]

[   11.442992] VGA switcheroo: detected DSM switching method \_SB_.PCI0.P0P2.PEGP handle
[   11.443025] nouveau 0000:02:00.0: power state changed by ACPI to D0
[   11.443036] nouveau 0000:02:00.0: power state changed by ACPI to D0
[   11.443042] nouveau 0000:02:00.0: enabling device (0106 -> 0107)
[   11.443050] nouveau 0000:02:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
[   11.443057] nouveau 0000:02:00.0: setting latency timer to 64
[   11.445975] [drm] nouveau 0000:02:00.0: Unsupported chipset 0x0c1880a1
[   11.446092] nouveau 0000:02:00.0: PCI INT A disabled
[   11.446099] nouveau: probe of 0000:02:00.0 failed with error -22
[   11.467238] i915 0000:00:02.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
[   11.467244] i915 0000:00:02.0: setting latency timer to 64
[   11.494808] mtrr: no more MTRRs available
[   11.494812] [drm] MTRR allocation failed.  Graphics performance may suffer.
[   11.494816] [drm] detected 63M stolen memory, trimming to 32M

This is from Dell XPS 15 L501X. All new XPS machines with Optimus and
geForce chips would share this issue.

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https://bugs.launchpad.net/bugs/700646

Title:
  nVIDIA 425M (with Optimus) is not detected