[Bug 92878] New: Black screen after backlight is off

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92878

            Bug ID: 92878
           Summary: Black screen after backlight is off
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: jeroko at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 119525
  --> https://bugs.freedesktop.org/attachment.cgi?id=119525&action=edit
dmesg(dmr.debug=0xe) lspci lshw dmidecode

I have a Toshiba Satellite P50t-C-104, it has an Intel Broadwell i7-5500U CPU
with an itegrated graphics card and a nvidia GPU 950M. For the moment I'm just
trying to get the intel card working, all the linux distributions I have tried
fail to initialize the kernel modesetting, including after updating to the
official 4.3 kernel. It works though when using the latest drm-intel-nightly
complided from git, but there is a lot of functionality missing.

The biggest problem is that, if the backlight goes off (either by suspending
the laptop or by waiting for the screen to power off after a few minutes of no
use), then when the backlight goes on again the screen stays black until I
reboot.

Other issues are:
 - I had to switch back to uxa "Accel method" in xorg.conf, the default sna
did't draw most of the text characters in the desktop.
 - Function keys don't work.

- system architecture: x86_64
- kernel version: 4.3.0-drm-intel-nightly-20151109+
   commit 62699a66482e7b56e8bfc0683d11d509b022147d
   Author: Matt Roper <matthew.d.roper at intel.com>
   Date:   Mon Nov 9 10:34:57 2015 -0800
    drm-intel-nightly: 2015y-11m-09d-18h-34m-23s UTC integration manifest

- Linux distribution: Linux Mint 17.2
- Display connector: laptop lcd screen

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