[Bug 94513] New: stall inside drm_mode_setcrtc on haswell w/ external monitor on docking station

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94513

            Bug ID: 94513
           Summary: stall inside drm_mode_setcrtc on haswell w/ external
                    monitor on docking station
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: tiagomatos at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

I'm seeing a long stall with this stack trace on kernel
4.5.0-0.rc7.git0.1.fc24.x86_64 :

[<ffffffffa00a4bd8>] drm_dp_mst_wait_tx_reply+0xa8/0x200 [drm_kms_helper]
[<ffffffffa00a7202>] drm_dp_payload_send_msg+0xd2/0x200 [drm_kms_helper]
[<ffffffffa00a74cd>] drm_dp_update_payload_part1+0x19d/0x380 [drm_kms_helper]
[<ffffffffa018d3ec>] intel_mst_disable_dp+0x4c/0xb0 [i915]
[<ffffffffa0160933>] haswell_crtc_disable+0x183/0x310 [i915]
[<ffffffffa0169460>] intel_atomic_commit+0x7b0/0x1880 [i915]
[<ffffffffa005594a>] drm_atomic_commit+0x3a/0x60 [drm]
[<ffffffffa00acad6>] drm_atomic_helper_set_config+0x76/0xb0 [drm_kms_helper]
[<ffffffffa0044bf5>] drm_mode_set_config_internal+0x65/0x100 [drm]
[<ffffffffa004932f>] drm_mode_setcrtc+0x2ef/0x520 [drm]
[<ffffffffa003a712>] drm_ioctl+0x152/0x540 [drm]
[<ffffffff81256d33>] do_vfs_ioctl+0xa3/0x5d0
[<ffffffff812572d9>] SyS_ioctl+0x79/0x90
[<ffffffff817cdb2e>] entry_SYSCALL_64_fastpath+0x12/0x6d
[<ffffffffffffffff>] 0xffffffffffffffff

This happens only if I have an external monitor connected to this thinkpad
x240's dock station.

Using fedora kernels I'm able to say that this started happening between
v4.3-9393-gbd4f203 (good)
and
v4.3-11481-gc5a3788 (bad)

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