[Bug 82763] New: [drm:intel_dp_start_link_train] error on connecting an external monitor on VGA

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82763

          Priority: medium
            Bug ID: 82763
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [drm:intel_dp_start_link_train] error on connecting an
                    external monitor on VGA
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: daniele.pizzolli at create-net.org
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: DRI CVS
         Component: DRM/Intel
           Product: DRI

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.

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