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<base href="https://bugs.freedesktop.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Fails to wake Display Port monitor after putting the monitor to sleep."
href="https://bugs.freedesktop.org/show_bug.cgi?id=91740">91740</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Fails to wake Display Port monitor after putting the monitor to sleep.
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>XOrg git
</td>
</tr>
<tr>
<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>daniel.rowe@fathom13.com
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>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</pre>
</div>
</p>
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