[Bug 98569] New: Screen comes up blank when booting Thinkpad X230 with VGA connected to docking station

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98569

            Bug ID: 98569
           Summary: Screen comes up blank when booting Thinkpad X230 with
                    VGA connected to docking station
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: patrik.flykt at linux.intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 127718
  --> https://bugs.freedesktop.org/attachment.cgi?id=127718&action=edit
Kernel logs from boot to poweroff

Hardware is a Thinkpad x230 connected to a ThinkPad UltraBase Series 3 docking
station. Kernel uname is Linux 4.8.6 #2 SMP PREEMPT Thu Nov 3 11:32:32 EET 2016
x86_64 GNU/Linux and the system is running latest Debian testing.

Software versions used from Debian testing
libdrm-intel1:amd64         2.4.71-1
xserver-xorg-video-intel    2:2.99.917+git20160706-1
gdm3                        3.22.1-1

lspci -v reports
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor
Graphics Controller (rev 09) (prog-if 00 [VGA controller])
        Subsystem: Lenovo 3rd Gen Core processor Graphics Controller
        Flags: bus master, fast devsel, latency 0, IRQ 26
        Memory at f0000000 (64-bit, non-prefetchable) [size=4M]
        Memory at e0000000 (64-bit, prefetchable) [size=256M]
        I/O ports at 5000 [size=64]
        [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
        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

The CPUs are identified as 
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 58
model name      : Intel(R) Core(TM) i7-3520M CPU @ 2.90GHz
stepping        : 9
microcode       : 0x1c
...

Booting with an external display connected to the DisplayPort on the docking
station and laptop lid open/closed works perfectly well; gdm login screen is
shown on the external display and everything works fine. Connecting another
external display via VGA once the system has booted up works perfectly as well,
both the DisplayPort and VGA screens are combined to form one big desktop.

What does not work is to boot with both the DisplayPort and VGA displays
connected. The laptop boots up, launches gdm, but ends up with:
 - background pattern/color on the screen connected to DisplayPort
 - nothing on the screen connected to VGA where the monitor goes to power
   saving due to no input signal
 - laptop LCD shows the same background pattern/color
 - laptop LCD shows a mouse pointer
 - neither the touch pad or the external USB mouse works
 - neither the built in or the external keyboard works

In this situation the only option is to press the power key and reboot.

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