From: Jani Nikula <jani.nikula@linux.intel.com>
To: Arnd Hannemann <arnd@arndnet.de>,
intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org
Subject: Re: [Intel-gfx] 3.18.0-rc3: i915: eDP connected Display stays blank
Date: Thu, 06 Nov 2014 11:39:15 +0200 [thread overview]
Message-ID: <87sihw3by4.fsf@intel.com> (raw)
In-Reply-To: <545B3BEA.2090105@arndnet.de>
On Thu, 06 Nov 2014, Arnd Hannemann <arnd@arndnet.de> wrote:
> Hi,
>
> I have a Thinkpad T440s (Haswell) connected to two additional Monitors
> via a Docking Station (MST).
>
> During Bootup all three displays work, even when X is started.
> However, if the laptop display is turned off once (either because of
> power saving, or via xrandr), it fails to "come back".
> That is if I try to re-enable it the Display stays blank.
> I believe this used to work in 3.17.
>
> Here is the xrandr Ouput of the edp, when its enabled (but staying blank):
> Screen 0: minimum 8 x 8, current 3840 x 1200, maximum 32767 x 32767
> eDP1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 309mm x 175mm
> 1920x1080 60.0*+ 59.9
>
> here is the debug output, while trying to enable it:
>
...
> [ 416.538848] [drm:intel_edp_backlight_power] panel power control backlight disable
>
>
> I'm happy to provide further input.
What does cat /sys/class/backlight/intel_backlight/bl_power say? What if
you echo 0 there?
BR,
Jani.
--
Jani Nikula, Intel Open Source Technology Center
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next prev parent reply other threads:[~2014-11-06 9:39 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-06 9:14 3.18.0-rc3: i915: eDP connected Display stays blank Arnd Hannemann
2014-11-06 9:39 ` Jani Nikula [this message]
2014-11-06 10:28 ` Arnd Hannemann
2014-11-06 12:53 ` Jani Nikula
2014-11-07 9:27 ` Arnd Hannemann
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