[Bug 91740] New: Fails to wake Display Port monitor after putting the monitor to sleep.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91740

            Bug ID: 91740
           Summary: Fails to wake Display Port monitor after putting the
                    monitor to sleep.
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: daniel.rowe at fathom13.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

After a Samsung monitor goes to sleep if fails to wake up requiring the
monitors power cable to be pull of the DP called pulled.

This is in the logs:

[356509.261411] [drm:intel_dp_complete_link_train [i915]] *ERROR* failed to
start channel equalization
[357167.172244] [drm:intel_dp_start_link_train [i915]] *ERROR* too many full
retries, give up

Monitor details: Samsung S27D850T running at 2560X1440

Kernel: 4.1.5-200.fc22.x86_64

lspci:

00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core
Processor Family Integrated Graphics Controller (rev 09) (prog-if 00 [VGA
controller])
    DeviceName:  Onboard Graphics
    Subsystem: Acer Incorporated [ALI] Device 0493
    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 31
    Region 0: Memory at fe000000 (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: feeff00c  Data: 4182
    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

for file in /sys/module/i915/parameters/*; do echo -en $file"\t"; sudo cat
$file; done;
/sys/module/i915/parameters/disable_display    N
/sys/module/i915/parameters/disable_power_well    1
/sys/module/i915/parameters/disable_vtd_wa    N
/sys/module/i915/parameters/enable_cmd_parser    1
/sys/module/i915/parameters/enable_execlists    0
/sys/module/i915/parameters/enable_fbc    -1
/sys/module/i915/parameters/enable_hangcheck    Y
/sys/module/i915/parameters/enable_ips    1
/sys/module/i915/parameters/enable_ppgtt    1
/sys/module/i915/parameters/enable_psr    0
/sys/module/i915/parameters/enable_rc6    1
/sys/module/i915/parameters/fastboot    N
/sys/module/i915/parameters/invert_brightness    0
/sys/module/i915/parameters/load_detect_test    N
/sys/module/i915/parameters/lvds_channel_mode    0
/sys/module/i915/parameters/lvds_downclock    0
/sys/module/i915/parameters/lvds_use_ssc    -1
/sys/module/i915/parameters/mmio_debug    0
/sys/module/i915/parameters/modeset    -1
/sys/module/i915/parameters/nuclear_pageflip    N
/sys/module/i915/parameters/panel_ignore_lid    1
/sys/module/i915/parameters/prefault_disable    N
/sys/module/i915/parameters/preliminary_hw_support    0
/sys/module/i915/parameters/reset    Y
/sys/module/i915/parameters/semaphores    -1
/sys/module/i915/parameters/use_mmio_flip    0
/sys/module/i915/parameters/vbt_sdvo_panel_type    -1
/sys/module/i915/parameters/verbose_state_checks    Y

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