[Bug 98871] New: DisplayPort of ThinkPad dock disabled after resume

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=98871

            Bug ID: 98871
           Summary: DisplayPort of ThinkPad dock disabled after resume
           Product: Drivers
           Version: 2.5
    Kernel Version: >= 3.18.3
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: c.felsch at gmx.de
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

Hello,
my system is a ThinkPad T540p attached to an Ultra Dock with Debian Jessie
64bit installed.
On the dock's DP an external Eizo LCD is connected and the lid of the ThinkPad
is normally closed.
After a resume from Suspend-to-RAM, the LCD of the ThinkPad awakes but the
external LCD stays turned-off.
It is possible to reactivate the external LCD manually with KDE's krandrtray.
I observed this behavior with kernels 3.18.3 and newer. With kernel version
3.18.2 and older, both LCDs are reactivated after a resume automatically.

Some info about the system:
/proc/cpuinfo  
 processor       : 0
 vendor_id       : GenuineIntel
 cpu family      : 6
 model           : 60
 model name      : Intel(R) Core(TM) i7-4700MQ CPU @ 2.40GHz


lspci -k | grep -A2 VGA 
 00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor
Integrated Graphics Controller (rev 06)
        Subsystem: Lenovo Device 221e
        Kernel driver in use: i915
 --
 01:00.0 VGA compatible controller: NVIDIA Corporation GK208M [GeForce GT 730M]
(rev a1)
 (-> disabled, not configured for X11!)

/var/log/Xorg.0.log
 (II) Loading /usr/lib/xorg/modules/drivers/intel_drv.so
 (II) Module intel: vendor="X.Org Foundation"
    compiled for 1.15.99.904, module version = 2.21.15
    Module class: X.Org Video Driver
    ABI class: X.Org Video Driver, version 18.0
 (II) LoadModule: "modesetting"
 (II) Loading /usr/lib/xorg/modules/drivers/modesetting_drv.so
 (II) Module modesetting: vendor="X.Org Foundation"
    compiled for 1.15.99.904, module version = 0.9.0
    Module class: X.Org Video Driver
    ABI class: X.Org Video Driver, version 18.0
...
 (II) intel(0): Output eDP1 using monitor section eDP1        -> internal LCD
 (**) intel(0): Option "PreferredMode" "1920x1080"
 (--) intel(0): found backlight control interface
/sys/class/backlight/intel_backlight
 (II) intel(0): Output VGA1 has no monitor section
 (II) intel(0): Output DP1 has no monitor section
 (II) intel(0): Output HDMI1 has no monitor section
 (II) intel(0): Output DP2 using monitor section DP2        -> external LCD
 (**) intel(0): Option "PreferredMode" "1920x1200"
 (II) intel(0): Output HDMI2 has no monitor section
 (II) intel(0): Output DP3 has no monitor section
 (II) intel(0): Output DP4 has no monitor section
 (II) intel(0): Output DP5 has no monitor section


Please, let me know if you need additional debugging output.

Best regards,
 Chris

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