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External mini displayport monitor on dell e7440 (HD 4400)

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Magnusson's picture

Jan 30, 2015 - 06:33am

  • I'm trying to get an external monitor to work with my Dell e7440 laptop via mini displayport.
    All that happens is that the laptop display flickers a bit and I get this in dmesg:
    [63938.020167] ------------[ cut here ]------------
    [63938.020191] WARNING: CPU: 0 PID: 1430 at /home/apw/COD/linux/drivers/gpu/drm/i915/intel_dp.c:3652 intel_dp_link_down+0x223/0x260 [i915]()
    [63938.020192] Modules linked in: nls_utf8 udf crc_itu_t ctr ccm cdc_mbim cdc_wdm qcserial cdc_ncm usb_wwan usbnet mii usbserial pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) arc4 pn544_mei mei_phy pn544 hci nfc dell_wmi sparse_keymap intel_rapl x86_pkg_temp_thermal intel_powerclamp dell_laptop dcdbas coretemp btusb kvm_intel kvm dm_multipath snd_hda_codec_realtek rfcomm snd_hda_codec_generic crct10dif_pclmul scsi_dh bnep crc32_pclmul ghash_clmulni_intel snd_hda_codec_hdmi bluetooth aesni_intel iwlmvm aes_x86_64 lrw gf128mul mac80211 glue_helper snd_soc_rt5640 ablk_helper cryptd snd_soc_rl6231 snd_soc_core uvcvideo snd_hda_intel snd_hda_controller iwlwifi videobuf2_vmalloc snd_compress snd_hda_codec snd_seq_midi snd_pcm_dmaengine videobuf2_memops snd_hwdep serio_raw videobuf2_core snd_seq_midi_event joydev binfmt_misc v4l2_common cfg80211 videodev snd_rawmidi snd_seq media snd_pcm lpc_ich mei_me mei i2c_hid snd_seq_device snd_timer snd snd_soc_sst_acpi i2c_designware_platform soundcore i2c_designware_core dw_dmac 8250_fintek spi_pxa2xx_platform dell_smo8800 8250_dw dw_dmac_core mac_hid parport_pc ppdev lp parport dm_mirror dm_region_hash dm_log hid_apple hid_generic usbhid hid mmc_block i915 i2c_algo_bit e1000e drm_kms_helper ahci psmouse libahci drm ptp sdhci_pci pps_core wmi sdhci_acpi video sdhci
    [63938.020223] CPU: 0 PID: 1430 Comm: Xorg Tainted: G        W  OE  3.18.3-031803-generic #201501161810
    [63938.020224] Hardware name: Dell Inc. Latitude E7440/07F3F4, BIOS A11 08/28/2014
    [63938.020225]  0000000000000e44 ffff88020f03ba28 ffffffff817a63b9 0000000000000007
    [63938.020226]  0000000000000000 ffff88020f03ba68 ffffffff81074b2c ffff88020f03ba98
    [63938.020228]  ffff880035cd0000 ffff880212cd40e0 ffff880212db4000 0000000080000006
    [63938.020229] Call Trace:
    [63938.020231]  [<ffffffff817a63b9>] dump_stack+0x46/0x58
    [63938.020233]  [<ffffffff81074b2c>] warn_slowpath_common+0x8c/0xc0
    [63938.020235]  [<ffffffff81074b7a>] warn_slowpath_null+0x1a/0x20
    [63938.020246]  [<ffffffffc02c15a3>] intel_dp_link_down+0x223/0x260 [i915]
    [63938.020273]  [<ffffffffc02c7e91>] intel_dp_complete_link_train+0x101/0x220 [i915]
    [63938.020291]  [<ffffffffc02bf947>] intel_ddi_pre_enable+0x137/0x1b0 [i915]
    [63938.020304]  [<ffffffffc02ad254>] haswell_crtc_enable+0x134/0x350 [i915]
    [63938.020316]  [<ffffffffc02ab4c7>] __intel_set_mode+0x327/0x490 [i915]
    [63938.020329]  [<ffffffffc02af8f6>] intel_set_mode+0x16/0x30 [i915]
    [63938.020339]  [<ffffffffc02b03f6>] intel_crtc_set_config+0x1e6/0x370 [i915]
    [63938.020342]  [<ffffffff817b1a66>] ? mutex_lock+0x16/0x37
    [63938.020351]  [<ffffffffc0149f90>] drm_mode_set_config_internal+0x60/0x100 [drm]
    [63938.020360]  [<ffffffffc014daa0>] drm_mode_setcrtc+0x290/0x4e0 [drm]
    [63938.020367]  [<ffffffffc013ee46>] drm_ioctl+0x2e6/0x590 [drm]
    [63938.020385]  [<ffffffffc014d810>] ? drm_mode_setplane+0x240/0x240 [drm]
    [63938.020387]  [<ffffffff812024a5>] do_vfs_ioctl+0x75/0x2c0
    [63938.020389]  [<ffffffff811f02e6>] ? vfs_write+0x196/0x1f0
    [63938.020390]  [<ffffffff8120cac5>] ? __fget_light+0x25/0x70
    [63938.020392]  [<ffffffff81202781>] SyS_ioctl+0x91/0xb0
    [63938.020393]  [<ffffffff817af9e9>] ? schedule+0x29/0x70
    [63938.020395]  [<ffffffff817b3c2d>] system_call_fastpath+0x16/0x1b
    [63938.020396] ---[ end trace b49ace216abca6ce ]---
    [63938.023292] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP, aborting
    The external monitor in questing is an iMac 27" in target display mode (it's the 2009 model that supports mini displayport).
    Unfortunately I don't have any other mini displayport equipped machines that I can test with, and I don't have Windows on this machine to check if it is a Linux specific issue, so it's a little bit hard to troubleshoot. 
    Does anyone here have any experience with this combination of hardware?
    Jan 30, 2015 - 06:33am