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<base href="https://bugs.freedesktop.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [drm:intel_dp_start_link_train] error on connecting an external monitor on VGA"
href="https://bugs.freedesktop.org/show_bug.cgi?id=82763">82763</a>
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Summary</th>
<td>[drm:intel_dp_start_link_train] error on connecting an external monitor on VGA
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Reporter</th>
<td>daniele.pizzolli@create-net.org
</td>
</tr>
<tr>
<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>DRI CVS
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr></table>
<p>
<div>
<pre>The hardware:
Dell Inc. Latitude E5440/08RCYC, BIOS A07
lspci:
00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated
Graphics Controller (rev 0b)
On debian jessies with the latest stable kernel: Linux 3.16
While plugging in a VGA monitor I see a warning in dmesg output and
the monitor does not show up in the xrandr output.
dmesg:
[29593.764302] WARNING: CPU: 0 PID: 5715 at
drivers/gpu/drm/i915/intel_dp.c:3122 intel_dp_complete_link_train+0xe9/0x330
[i915]()
[29593.764303] Modules linked in: btrfs xor raid6_pq ufs qnx4 hfsplus hfs minix
ntfs vfat msdos fat jfs xfs libcrc32c hid_generic usbhid hid pci_stub
vboxpci(O) vboxnetadp(O) vboxnetflt(O) vboxdrv(O) snd_hda_codec_hdmi
snd_hda_codec_realtek snd_hda_codec_generic iTCO_wdt iTCO_vendor_support joydev
nouveau dell_wmi sparse_keymap mxm_wmi ppdev arc4 dell_laptop dcdbas
x86_pkg_temp_thermal intel_powerclamp intel_rapl coretemp kvm_intel kvm pcspkr
evdev psmouse serio_raw ecb btusb bluetooth uvcvideo videobuf2_vmalloc
videobuf2_memops videobuf2_core v4l2_common videodev media iwlmvm mac80211
iwlwifi cfg80211 ttm snd_hda_intel lpc_ich snd_hda_controller mfd_core rfkill
snd_hda_codec i2c_i801 mei_me i915 snd_hwdep mei snd_pcm snd_timer snd
soundcore shpchp parport_pc drm_kms_helper parport drm i2c_algo_bit wmi
i2c_core video battery ac button processor loop fuse autofs4 ext4 crc16 mbcache
jbd2 dm_crypt dm_mod sg sd_mod sr_mod crc_t10dif cdrom crct10dif_generic uas
usb_storage crct10dif_pclmul crct10dif_common crc32_pclmul crc32c_intel
ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper
cryptd ahci libahci libata ehci_pci scsi_mod ehci_hcd xhci_hcd sdhci_pci sdhci
e1000e mmc_core ptp usbcore pps_core usb_common thermal thermal_sys
[29593.764357] CPU: 0 PID: 5715 Comm: kworker/0:1 Tainted: G W O
3.16.0+ #1
[29593.764358] Hardware name: Dell Inc. Latitude E5440/08RCYC, BIOS A07
06/26/2014
[29593.764366] Workqueue: events i915_hotplug_work_func [i915]
[29593.764367] 0000000000000009 ffffffff814ef07d 0000000000000000
ffffffff81064c12
[29593.764369] ffff8800cb1380d8 0000000000000006 0000000000000000
ffff8800cb138118
[29593.764372] ffff8800cb1380f3 ffffffffa04ace39 8000000601000001
00000080777780d8
[29593.764374] Call Trace:
[29593.764377] [<ffffffff814ef07d>] ? dump_stack+0x41/0x51
[29593.764380] [<ffffffff81064c12>] ? warn_slowpath_common+0x72/0x90
[29593.764387] [<ffffffffa04ace39>] ? intel_dp_complete_link_train+0xe9/0x330
[i915]
[29593.764395] [<ffffffffa04ad641>] ? intel_dp_check_link_status+0xa1/0x180
[i915]
[29593.764402] [<ffffffffa046c8e1>] ? i915_hotplug_work_func+0x1e1/0x330
[i915]
[29593.764405] [<ffffffff8107e9ef>] ? process_one_work+0x16f/0x450
[29593.764408] [<ffffffff8107f333>] ? worker_thread+0x63/0x540
[29593.764410] [<ffffffff8107f2d0>] ? rescuer_thread+0x2d0/0x2d0
[29593.764413] [<ffffffff8108534a>] ? kthread+0xca/0xe0
[29593.764415] [<ffffffff81085280>] ? kthread_create_on_node+0x180/0x180
[29593.764417] [<ffffffff814f4bfc>] ? ret_from_fork+0x7c/0xb0
[29593.764419] [<ffffffff81085280>] ? kthread_create_on_node+0x180/0x180
[29593.764420] ---[ end trace 2feeb7f0c4f81b25 ]---
[29593.788656] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP,
aborting
Let me know if you need further information.</pre>
</div>
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