[Bug 90340] RADEON "PITCAIRN" displayport output breaks when monitor turned off and on

[Bug 90340] RADEON "PITCAIRN" displayport output breaks when monitor turned off and on

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=90340

            Bug ID: 90340
           Summary: RADEON "PITCAIRN" displayport output breaks when
                    monitor turned off and on
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: steve@einval.com

As initially reporte in Debian at
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=783705

I'm running Debian Jessie (3.16.x kernel) on a machine with a Pitcairn-based
video adapter and an NEC Multisync EA274WMi 27" monitor, connected via
DisplayPort.

I've also tried upgrading to the 4.0 kernel and I see exactly the same
symptoms.

If I turn the monitor off and then on again (as I was doing overnight), I get
no display at all. 

I've wiggled the mouse, hit numlock on the keybard (the numlock
led illuminates fine), etc., but no display. I've seen this kind of
thing happen in the past on some machines, so I switch to VT1 and back
to see if that helps. Still no display at all, either on console or
under X. I log in remotely and I can see that the Xorg.0.log file has
been updated with mode lines for the monitor, suggesting things have
just woken up fine. But still no display.

Here's the really weird thing: at this point, the monitor has
basically locked up. It won't respond to the power/input/menu butttons
at all, and is still showing the blue LED that says "I have signal"
rather than switching to the amber "no signal" warning. Therefore, I
can only assume there's a problem here with some weird invalid DP
signal being produced.

I've carried on playing with this. If I log in from another machine and run
xrandr, I can see the display details of the monitor just fine. If I use xrandr
to turn the display off and then on again:

xrandr --output DisplayPort-0 --off
xrandr --output DisplayPort-0 2560x1440

then things start working again.

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[Bug 90340] RADEON "PITCAIRN" displayport output breaks when monitor turned off and on

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=90340

Niels Ole Salscheider <niels_ole@salscheider-online.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |niels_ole@salscheider-onlin
                   |                            |e.de

--- Comment #1 from Niels Ole Salscheider <niels_ole@salscheider-online.de> ---
I have seen similar behaviour on a Barts card with an NEC MultiSync PA271W...

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[Bug 90340] RADEON "PITCAIRN" displayport output breaks when monitor turned off and on

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https://bugs.freedesktop.org/show_bug.cgi?id=90340

--- Comment #2 from smoki <smoki00790@gmail.com> ---

 Might be some kind of setup issue as Xorg.0.log shows:

[    14.853] (EE) RADEON(0): eglInitialize() failed
[    14.853] (EE) RADEON(0): glamor detected, failed to initialize EGL.

 and 

[    14.437] (II) NVIDIA GLX Module  340.65  Tue Dec  2 09:10:06 PST 2014
...
[    15.071] (EE) Failed to initialize GLX extension (Compatible NVIDIA X
driver not found)

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[Bug 90340] RADEON "PITCAIRN" displayport output breaks when monitor turned off and on

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https://bugs.freedesktop.org/show_bug.cgi?id=90340

--- Comment #3 from Alex Deucher <alexdeucher@gmail.com> ---
Does forcing a dpms cycle also work?  E.g.,
sleep 5; xset dpms force off

Does turning the monitor off work with other drivers or OSes?  DP requires link
training to bring the link up between the monitor and the GPU.  I suspect when
you physically turn off/on the monitor, it does not generate a hotplug signal
so the driver had no way of knowing that the link needs to be re-established.

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[Bug 90340] RADEON "PITCAIRN" displayport output breaks when monitor turned off and on

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https://bugs.freedesktop.org/show_bug.cgi?id=90340

--- Comment #4 from Niels Ole Salscheider <niels_ole@salscheider-online.de> ---
I observed the following behaviour with my setup:
- the monitor never comes back on again under memtest86+ or in the BIOS
- it always comes back on again when on the console (with the raden driver
loaded at least)
- it sometimes (?) comes back on under X
- if it does not come back on, something like switching to the console, power
cycle, switching to X, switching to the console brings it back on the console,
but it will turn off as soon as you switch to X. Switching to the console again
turns it on, etc.

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[Bug 90340] RADEON "PITCAIRN" displayport output breaks when monitor turned off and on

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=90340

--- Comment #5 from Niels Ole Salscheider <niels_ole@salscheider-online.de> ---
BTW: Make sure that you use the original cable, otherwise you might have
problems with standby anyway:
http://www.necdisplay.com/documents/Miscellaneous/DisplayPort_Notice.pdf

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[Bug 90340] RADEON "PITCAIRN" displayport output breaks when monitor turned off and on

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https://bugs.freedesktop.org/show_bug.cgi?id=90340

--- Comment #6 from Christian König <deathsimple@vodafone.de> ---
(In reply to Niels Ole Salscheider from comment #4)
> - the monitor never comes back on again under memtest86+ or in the BIOS

That sounds a bit like a problem with the hardware. Can everybody else test
this in the BIOS as well?

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[Bug 90340] RADEON "PITCAIRN" displayport output breaks when monitor turned off and on

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=90340

Martin Peres <martin.peres@free.fr> changed:

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

--- Comment #7 from Martin Peres <martin.peres@free.fr> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/drm/amd/issues/613.

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