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<body><span class="vcard"><a class="email" href="mailto:arun@accosted.net" title="Arun Raghavan <arun@accosted.net>"> <span class="fn">Arun Raghavan</span></a>
</span> changed
<a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED --- - [snb dp dongle] Macbook 8.2, No output over DP using HDMI/VGA dongle"
href="https://bugs.freedesktop.org/show_bug.cgi?id=48749">bug 48749</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Status</td>
<td>NEEDINFO
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<td>REOPENED
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<b><a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED --- - [snb dp dongle] Macbook 8.2, No output over DP using HDMI/VGA dongle"
href="https://bugs.freedesktop.org/show_bug.cgi?id=48749#c5">Comment # 5</a>
on <a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED --- - [snb dp dongle] Macbook 8.2, No output over DP using HDMI/VGA dongle"
href="https://bugs.freedesktop.org/show_bug.cgi?id=48749">bug 48749</a>
from <span class="vcard"><a class="email" href="mailto:arun@accosted.net" title="Arun Raghavan <arun@accosted.net>"> <span class="fn">Arun Raghavan</span></a>
</span></b>
<pre>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 ]---</pre>
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