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<base href="https://bugs.freedesktop.org/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - i915 external Displays flicker / turn black"
href="https://bugs.freedesktop.org/show_bug.cgi?id=94479">94479</a>
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<th>Summary</th>
<td>i915 external Displays flicker / turn black
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
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<th>Version</th>
<td>XOrg git
</td>
</tr>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
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<th>OS</th>
<td>Linux (All)
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>DRM/Intel
</td>
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>thoehlig@benocs.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>
<tr>
<th>i915 features</th>
<td>display/HDMI
</td>
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<pre>Hi,
I recently got a new notebook and I have the problem, that the external
displays attached via HDMI / DP (via e-dock) flicker or turn black and loose
signal.
Normaly after around 3 seconds both external Displays turn back to normal.
(Only the external displays)
We have several notebooks sharing this problem, all with the same hardware and
always the same setup:
3 Displays 2x external via DP / HDMI 1920x1080 + E7450 build in with 1920x1080.
With the default ubuntu kernel 4.2.0.30-generic I got the dmesg message:
[drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
I tested a newer Kernel (see below), the error messages dissapeared but the
display problems are still present.
There is a corresponding bug report @ ubuntu launchpad
<a href="https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1488719">https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1488719</a> and
here <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [BDW][drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!"
href="show_bug.cgi?id=92084">https://bugs.freedesktop.org/show_bug.cgi?id=92084</a>.
There are 2 more launchpad user who encountered exactly the same behaviour.
uname -m x86_64
uname -r 4.5.0-040500rc7-generic
Distro: Ubuntu 14.04
Machine: E7450 Dell Latitude
Display connector: 2x HDMI / DP via eport + internal Display
lspci:
00:02.0 VGA compatible controller: Intel Corporation Broadwell-U Integrated
Graphics (rev 09) (prog-if 00 [VGA controller])
Subsystem: Dell Device 062e
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 51
Region 0: Memory at f5000000 (64-bit, non-prefetchable) [size=16M]
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
in addition we have a:
03:00.0 3D controller: NVIDIA Corporation GM108M [GeForce 840M]
but its not in use.
modinfo i915
filename:
/lib/modules/4.5.0-040500rc7-generic/kernel/drivers/gpu/drm/i915/i915.ko
license: GPL and additional rights
description: Intel Graphics
author: Intel Corporation
author: Tungsten Graphics, Inc.
firmware: i915/bxt_dmc_ver1.bin
firmware: i915/skl_dmc_ver1.bin
firmware: i915/skl_guc_ver4.bin
srcversion: A8C37B25F49F03AE77E49D0
cat /sys/class/drm/card0/error
no error state collected
dmesg with drm.debug=0x1e log_buf_len=1M as attachment.
The dmesg output ends after screens returned to normal. I didnt change the
screen, tabbed to terminal and cat dmesg > file.
xrandr --verbose as attachment too.
If you need more informations, please let me know.
Thank you in advance</pre>
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</p>
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