All of lore.kernel.org
 help / color / mirror / Atom feed
From: Arnd Hannemann <arnd@arndnet.de>
To: Jani Nikula <jani.nikula@linux.intel.com>,
	intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org
Subject: Re: 3.18.0-rc3: i915: eDP connected Display stays blank
Date: Thu, 06 Nov 2014 11:28:52 +0100	[thread overview]
Message-ID: <545B4D64.1010807@arndnet.de> (raw)
In-Reply-To: <87sihw3by4.fsf@intel.com>

Hi,

thanks for your quick response.

Am 06.11.2014 um 10:39 schrieb Jani Nikula:
> 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

root@kallisto:~# cat /sys/class/backlight/intel_backlight/bl_power
1

> you echo 0 there?

:-) Works my display comes back, when I echo 0 there.

Is user-space doing something wrong here?

Best regards
Arnd

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/intel-gfx

  reply	other threads:[~2014-11-06 10:28 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 ` [Intel-gfx] " Jani Nikula
2014-11-06 10:28   ` Arnd Hannemann [this message]
2014-11-06 12:53     ` Jani Nikula
2014-11-07  9:27       ` Arnd Hannemann

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=545B4D64.1010807@arndnet.de \
    --to=arnd@arndnet.de \
    --cc=dri-devel@lists.freedesktop.org \
    --cc=intel-gfx@lists.freedesktop.org \
    --cc=jani.nikula@linux.intel.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.