[Bug 48749] [snb dp dongle] Macbook 8.2, No output over DP using HDMI/VGA dongle

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=48749

Arun Raghavan <arun at accosted.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |REOPENED

--- Comment #5 from Arun Raghavan <arun at accosted.net> ---
Tried just now with 3.8-rc7. With DP->HDMI, same situation - I get EDID, but no
output. Could it be due to disabling the Radeon chip completely?

With a DP->VGA, I get the link train errors and a backtrace in dmesg when I
unplug:

[  580.031796] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP,
aborting
[  580.547201] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP,
aborting
[  581.127544] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP,
aborting
[  581.710798] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP,
aborting
[  582.294358] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP,
aborting
[  582.877297] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP,
aborting
[  583.457772] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP,
aborting
[  584.225601] ------------[ cut here ]------------
[  584.225614] WARNING: at drivers/gpu/drm/i915/intel_dp.c:1987
intel_dp_link_down+0x1c0/0x1d0()
[  584.225617] Hardware name: MacBookPro8,2
[  584.225619] Modules linked in: b43 bcma radeon ttm rfcomm bnep uvcvideo
videobuf2_vmalloc btusb videobuf2_memops videobuf2_core videodev bluetooth
media snd_hda_codec_hdmi snd_hda_codec_cirrus kvm_intel kvm sdhci_pci
snd_hda_intel crc32c_intel sdhci mmc_core snd_hda_codec snd_hwdep snd_pcm
snd_page_alloc snd_timer snd soundcore fuse xfs exportfs nfs lockd sunrpc
reiserfs btrfs libcrc32c zlib_deflate [last unloaded: b43]
[  584.225665] Pid: 4648, comm: Xorg Not tainted 3.8.0-rc7 #2
[  584.225667] Call Trace:
[  584.225674]  [<ffffffff81049cbf>] warn_slowpath_common+0x7f/0xc0
[  584.225678]  [<ffffffff81049d1a>] warn_slowpath_null+0x1a/0x20
[  584.225681]  [<ffffffff813e1300>] intel_dp_link_down+0x1c0/0x1d0
[  584.225685]  [<ffffffff813e3e81>] intel_disable_dp+0x51/0x80
[  584.225689]  [<ffffffff813d085a>] ironlake_crtc_disable+0x6da/0x830
[  584.225693]  [<ffffffff813d5766>] intel_crtc_update_dpms+0x76/0xb0
[  584.225696]  [<ffffffff813d585a>] intel_encoder_dpms+0x1a/0x30
[  584.225700]  [<ffffffff813d75dc>] intel_connector_dpms+0x3c/0x70
[  584.225704]  [<ffffffff8139cdf5>]
drm_mode_obj_set_property_ioctl+0x345/0x350
[  584.225707]  [<ffffffff8139ce30>]
drm_mode_connector_property_set_ioctl+0x30/0x40
[  584.225710]  [<ffffffff8138ba14>] drm_ioctl+0x474/0x530
[  584.225714]  [<ffffffff8139ce00>] ?
drm_mode_obj_set_property_ioctl+0x350/0x350
[  584.225719]  [<ffffffff8116024f>] do_vfs_ioctl+0x8f/0x4f0
[  584.225723]  [<ffffffff81160700>] sys_ioctl+0x50/0x90
[  584.225727]  [<ffffffff812d71be>] ? trace_hardirqs_on_thunk+0x3a/0x3c
[  584.225730]  [<ffffffff8139c5a0>] ? drm_mode_detachmode_ioctl+0x110/0x110
[  584.225734]  [<ffffffff816e20c2>] system_call_fastpath+0x16/0x1b
[  584.225736] ---[ end trace e7c6fa97df4c9cd8 ]---

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