[Bug 113741] New: regression: display becomes "disconnected" while suspended

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=113741

            Bug ID: 113741
           Summary: regression: display becomes "disconnected" while
                    suspended
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.4.3-300.fc23.x86_64
          Hardware: All
                OS: Linux
              Tree: Fedora
            Status: NEW
          Severity: high
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: fry.kun at gmail.com
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

My laptop is connected to 2 external monitors. Soon after screen is locked
(xscreensaver), the monitors go into suspend mode.
As of 4.4.x updates, this causes window manager (xfwm4-4.12.3-2.fc23.x86_64) to
detect one of the monitors as "disconnected" and all windows are moved to the
primary monitor.

When unlocked, both monitors are displaying everything, but windows had been
moved already and don't snap back to the 2nd monitor.

Also tried on 4.4.2-301.fc23.x86_64

Issue was not present on 4.3.x and earlier kernels (same setup, booted to
4.3.5-300.fc23.x86_64 does not have the problem)


Note, probably irrelevant, but video hardware is dual:

00:02.0 VGA compatible controller [0300]: Intel Corporation 4th Gen Core
Processor Integrated Graphics Controller [8086:0416] (rev 06) (prog-if 00 [VGA
controller])
    Subsystem: CLEVO/KAPOK Computer Device [1558:5281]
    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 35
    Region 0: Memory at f7400000 (64-bit, non-prefetchable) [size=4M]
    Region 2: Memory at d0000000 (64-bit, prefetchable) [size=256M]
    Region 4: I/O ports at f000 [size=64]
    Expansion ROM at <unassigned> [disabled]
    Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
        Address: fee00018  Data: 0000
    Capabilities: [d0] Power Management version 2
        Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
        Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
    Capabilities: [a4] PCI Advanced Features
        AFCap: TP+ FLR+
        AFCtrl: FLR-
        AFStatus: TP-
    Kernel driver in use: i915
    Kernel modules: i915


01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GK104M [GeForce
GTX 870M] [10de:1199] (rev ff) (prog-if ff)
    !!! Unknown header type 7f
    Kernel modules: nouveau, nvidia


Using bumblebee to enable nvidia card when necessary; usually it's left
disabled.

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