[Bug 94471] New: Displayport monitor randomly disconnects

[Bug 94471] New: Displayport monitor randomly disconnects

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=94471

            Bug ID: 94471
           Summary: Displayport monitor randomly disconnects
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.18.0-rc7.emp3
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: blocking
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: isaac@mm.st
        Regression: No

Created attachment 169651
  --> https://bugzilla.kernel.org/attachment.cgi?id=169651&action=edit
journalctl output showing disconnect and following reboot to recover

I have a display port monitor running at 2560x1440 60Hz that my laptop will
randomly disconnect from. When this occurs the following error shows up in the
system log:

[drm:drm_dp_get_mst_branch_device] *ERROR* failed to lookup MSTB with lct 2,
rad 00

The only recovery I have been able to manage on a consistent basis is to
restart the machine (and monitor it seems). Obviously not much of a workaround.

The last time this occurred I was able to fix this by disabling the display
with xrandr for awhile, then turning it back on. This last time this did not
work, and doing that a few times actually hard-locked the system.

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[Bug 94471] Displayport monitor randomly disconnects

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=94471

--- Comment #1 from Michel Dänzer <michel@daenzer.net> ---
I can only see references to an Intel GPU in the attached log, so the component
field of this report is set incorrectly.

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[Bug 94471] Displayport monitor randomly disconnects

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=94471

isaac@mm.st changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |intel-gfx-bugs@lists.freede
                   |                            |sktop.org
          Component|Video(DRI - non Intel)      |Video(DRI - Intel)

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[Bug 94471] Displayport monitor randomly disconnects

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=94471

--- Comment #2 from isaac@mm.st ---
Created attachment 169951
  --> https://bugzilla.kernel.org/attachment.cgi?id=169951&action=edit
Second journalctl dump from disconnect

Attaching a second log from most recent disconnect. This seems to have a new
type of error in it which I haven't seen before:

Mar 09 05:49:31 procyon /etc/gdm/Xsession[5551]:
[7977:7977:0309/054931:ERROR:display_info_provider_aura.cc(28)] Not implemented
reached in virtual void
extensions::DisplayInfoProviderAura::UpdateDisplayUnitInfoForPlatform(const
gfx::Display &, extensions::core_api

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[Bug 94471] Displayport monitor randomly disconnects

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=94471

Leho Kraav <leho@kraav.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |leho@kraav.com

--- Comment #3 from Leho Kraav <leho@kraav.com> ---
Kernel 3.19.3

I can confirm that similar things with that kernel error message is happening
here as well.

apr   08 12:25:10 papaya kernel: [drm:drm_dp_get_mst_branch_device.isra.17
[drm_kms_helper]] *ERROR* failed to lookup MSTB with lct 2, rad 00

I have an LG 27" 2560 http://www.lg.com/us/monitors/lg-27EA83-D-led-monitor
connected to DELL PR02X dock via DisplayPort.

* After docking the laptop, if the monitor was powered on and sitting in
standby, all xrandr activation attempts fail with "*ERROR* failed to lookup
MSTB with lct 2, rad 00"

* After docking the laptop, I always have to power cycle the monitor in order
for xrandr --output DP1-1-8 --auto to succeed. See above.


MST implementation has been very flaky from the time it was implemented, but I
do understand it's more like prototype stage thing still and not enough
resource is available to make it more bulletproof. I've been able to crash the
whole display system with just xrandr-based display connection management 
consistently, as in the screen goes completely blank with no way to bring it
back. Sucks a lot for being able to trust Linux with the basics, as a business
mobile desktop platform. Some more adventures for those interested
https://bugs.freedesktop.org/show_bug.cgi?id=85913

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[Bug 94471] Displayport monitor randomly disconnects

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=94471

--- Comment #4 from Leho Kraav <leho@kraav.com> ---
Forgot to say, on topic of the bug title, I'm also experiencing occasional
random monitor disconnections in the middle of work.

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[Bug 94471] Displayport monitor randomly disconnects

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=94471

Jani Nikula <jani.nikula@intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |OBSOLETE

--- Comment #5 from Jani Nikula <jani.nikula@intel.com> ---
Long time no updates, closing.

If the problem persists with latest kernels, please file a bug at the
freedesktop.org bugzilla [1], referencing this bug. Thank you.

[1] https://bugs.freedesktop.org/enter_bug.cgi?product=DRI&component=DRM/Intel

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