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[Bug 1217821] Re: Xmir doesn't start with MUXed Intel/ATi hybrid graphics

To: desktop-packages@xxxxxxxxxxxxxxxxxxx
From: Launchpad Bug Tracker <1217821@xxxxxxxxxxxxxxxxxx>
Date: Sat, 02 Jan 2016 04:17:22 -0000
Reply-to: Bug 1217821 <1217821@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

[Expired for Mir because there has been no activity for 60 days.]

** Changed in: mir
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1217821

Title:
  Xmir doesn't start with MUXed Intel/ATi hybrid graphics

Status in Mir:
  Expired
Status in xorg-server package in Ubuntu:
  Expired

Bug description:
  I've an Acer 4820TG notebook with MUXed Intel + ATi cards, and I can
  select which card to use via BIOS setting or somewhat dynamically
  using vgaswitcheroo.

  In case I set the notebook in dynamic mode on the bios, so that I've both the VGA cards available, XMir doesn't start, and I'm getting the X fallback session instead of lightdm.
  If I instead add an upstart job to force one of the cards to turn off early on the boot, it works instead.

  Using pure X this issue doesn't show up.

  00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 12) (prog-if 00 [VGA controller])
          Subsystem: Acer Incorporated [ALI] Device 0359
          Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
          Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
          Latency: 0
          Interrupt: pin A routed to IRQ 42
          Region 0: Memory at d8000000 (64-bit, non-prefetchable) [size=4M]
          Region 2: Memory at c0000000 (64-bit, prefetchable) [size=256M]
          Region 4: I/O ports at 4050 [size=8]
          Expansion ROM at <unassigned> [disabled]
          Capabilities: <access denied>
          Kernel driver in use: i915

  01:00.0 VGA compatible controller: Advanced Micro Devices, Inc.
  [AMD/ATI] Madison [Mobility Radeon HD 5650/5750 / 6530M/6550M] (rev
  ff) (prog-if ff)

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