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From: Jani Nikula <jani.nikula@linux.intel.com>
To: Derek Yerger <dy@drexel.edu>, Daniel Vetter <daniel.vetter@intel.com>
Cc: intel-gfx@lists.freedesktop.org
Subject: Re: PROBLEM: displayport MST external monitors don't return from sleep mode
Date: Thu, 14 Jan 2016 11:20:19 +0200	[thread overview]
Message-ID: <87k2ncy0to.fsf@intel.com> (raw)
In-Reply-To: <56970E17.8050503@drexel.edu>

On Thu, 14 Jan 2016, Derek Yerger <dy@drexel.edu> wrote:
> Kind Regards,
> Derek Yerger
> Computer Engineering
> 10171358 / djy24
> [1.] displayport MST external monitors don't return from sleep mode
>
> [2.] When displays go to sleep, upon return from sleep the two monitors 
> attached to a belkin mini displayport to 2x HDMI, do not return from 
> sleep. This results in part of the desktop being inaccessible, until the 
> external displays are unplugged, and then plugged back in.
>
> Sometimes, Xorg will also back down to one monitor. The data 
> accompanying this report is for an instance where the power save mode 
> caused Xorg to drop to the primary monitor only.
>
> This is on a Dell XPS 13 (9333) using intel i915. There are two external 
> monitors connected by HDMI to a DP-MST adapter which connects to the 
> single mini-displayport. A single-HDMI-to-mini-displayport adapter works 
> as expected (coming out of power save).
>
> The bug can be reproduced by either letting the screen power save 
> timeout elapse, or by running "xset dpms force off"

Please report i915 bugs at the freedesktop.org bugzilla:
https://bugs.freedesktop.org/enter_bug.cgi?product=DRI&component=DRM/Intel

But before doing so, please check if your issue might be one of these
existing DP MST bugs: https://goo.gl/VERzzh


BR,
Jani.

-- 
Jani Nikula, Intel Open Source Technology Center
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Intel-gfx mailing list
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      reply	other threads:[~2016-01-14  9:20 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-01-14  2:55 PROBLEM: displayport MST external monitors don't return from sleep mode Derek Yerger
2016-01-14  9:20 ` Jani Nikula [this message]

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