[Bug 91508] [i915] External monitor doesn't work resuming from screen saver

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91508

--- Comment #6 from Derek Yerger <dy at drexel.edu> ---
I believe I have the same issue.

Kernel: Linux version 4.4.0-999-generic (kernel at tangerine) (gcc version 5.2.1
20151010 (Ubuntu 5.2.1-22ubuntu2) ) #201601122100 SMP Wed Jan 13 02:02:49 UTC
2016

Release: Ubuntu 15.10

00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated
Graphics Controller (rev 09) (prog-if 00 [VGA controller])
    Subsystem: Dell Device 060a
    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 f0000000 (64-bit, non-prefetchable) [size=4M]
    Region 2: Memory at e0000000 (64-bit, prefetchable) [size=256M]
    Region 4: I/O ports at 3000 [size=64]
    Expansion ROM at <unassigned> [disabled]
    Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
        Address: fee0f00c  Data: 41a1
    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 

X.Org X Server 1.17.2

Machine: Dell XPS 13 9333 with bios A08 (latest)
Setup: Belkin 2x HDMI to mini-displayport
Originally reported:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1527829

The issue doesn't occur if sleep mode is activated less than 10s. I wrote a
script to go through various intervals and get the output of dmesg immediately
following an "xset dpms force off".

Files debug14-8s, debug14-9s are with successful external monitor restore
(expected behavior)

Files debug14-10s, debug14-11s are with the display resuming and the two
external monitors don't wake.

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