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

[Marco Trevisan (Treviño)]

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)

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu Package testing tracker.

A list of all reports related to this bug can be found here:
http://packages.qa.ubuntu.com/qatracker/reports/bugs/1217821

[Daniel van Vugt (vanvugt)]

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?

[Daniel van Vugt (vanvugt)]

Turns out bugs don't automatically expire if someone is assigned to them.

[Launchpad Janitor (janitor)]

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

[Launchpad Janitor (janitor)]

[Expired for xorg-server (Ubuntu) because there has been no activity for 60 days.]