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

To: desktop-packages@xxxxxxxxxxxxxxxxxxx
From: Daniel van Vugt <daniel.van.vugt@xxxxxxxxxxxxx>
Date: Thu, 17 Sep 2015 06:52:20 -0000
Reply-to: Bug 1217821 <1217821@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

XMir 1.0 (the old Xorg extension) is now deprecated and is not being
maintained or fixed. It is replaced by the new 'Xmir' binary (package
'xmir') introduced in Ubuntu 15.10 wily.

Is there any way to reproduce this bug without the old Xmir?

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

** Changed in: xorg-server (Ubuntu)
       Status: Triaged => Incomplete

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

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

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

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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