[Bug 88124] New: i915: regression: after DP connected monitor is turned off, when turned on, it does not work anymore

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88124

            Bug ID: 88124
           Summary: i915: regression: after DP connected monitor is turned
                    off, when turned on, it does not work anymore
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: jpirko at redhat.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 111865
  --> https://bugs.freedesktop.org/attachment.cgi?id=111865&action=edit
dmesg output with drm.debug=14

I'm experiencing this issue on Fedora kernel, but I tested that upstream
kernel behaves the same.

Description of problem:

On my T440s machine I'm experiencing this regression when if I turn off
DP connected display, I can never make graphics work again.

Version-Release number of selected component (if applicable):
3.17.6-200.fc20.x86_64

How reproducible:
always

Steps to Reproduce:
1. have DP connected display
2. turn it off
3. turn it on

Actual results:
No signal in display.

Expected results:
There's signal going into display, everything is flooded in colours.

Additional info:
With 3.16.4-200.fc20.x86_64 this is working without any issues.
I tested with current Linus's git (58628a7831edac5f7a13) and the issue is
still there. I even tried kernel from git://anongit.freedesktop.org/drm-intel
(a719ac1cbb45e1af3f79a4e112cefef8bf47378e). Issue is still there.

00:02.0 0300: 8086:0a16 (rev 0b) (prog-if 00 [VGA controller])
        Subsystem: 17aa:220c
        Flags: bus master, fast devsel, latency 0, IRQ 60
        Memory at f0000000 (64-bit, non-prefetchable) [size=4M]
        Memory at e0000000 (64-bit, prefetchable) [size=256M]
        I/O ports at 3000 [size=64]
        Expansion ROM at <unassigned> [disabled]
        Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
        Capabilities: [d0] Power Management version 2
        Capabilities: [a4] PCI Advanced Features
        Kernel driver in use: i915
        Kernel modules: i915

Screen 0: minimum 320 x 200, current 1920 x 1200, maximum 8192 x 8192
eDP-0 connected (normal left inverted right x axis y axis)
   1920x1080     60.01 +
   1400x1050     59.98
   1280x1024     60.02
   1280x960      60.00
   1024x768      60.00
   800x600       60.32    56.25
   640x480       59.94
DP-0 disconnected (normal left inverted right x axis y axis)
HDMI-0 disconnected (normal left inverted right x axis y axis)
DP-1 connected primary 1920x1200+0+0 (normal left inverted right x axis y axis)
518mm x 324mm
   1920x1200     59.95*+
   1920x1080     60.00    50.00    59.94
   1920x1080i    60.00    50.00    59.94
   1600x1200     60.00
   1680x1050     59.95
   1280x1024     60.02
   1440x900      59.89
   1280x960      60.00
   1280x720      60.00    50.00    59.94
   1024x768      60.00
   800x600       60.32
   720x576       50.00
   720x480       60.00    59.94
   640x480       60.00    59.94
HDMI-1 disconnected (normal left inverted right x axis y axis)


Please let me know if you need me to provide any other info. I'm eager to
test patches.

Drm debug dmesg output attached:
  52.486667 - I turned off DP display
  73.574508 - I turned the DP display on again

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