[Bug 97818] New: Laptop stopped automatically switching from docking station video to standalone and back

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97818

            Bug ID: 97818
           Summary: Laptop stopped automatically switching from docking
                    station video to standalone and back
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: giacecco at dico.im
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

I believe the issue is related in some way to the Linux kernel - as I could
test 4.7.2-201 vs 4.6.7-300 on the same laptop and the latter version has no
issues - but the people on Linux kernel's bugzilla bounced me away and asked to
post here instead (https://bugzilla.kernel.org/show_bug.cgi?id=156781).

The following has been tested using Fedora 24 on a Thinkpad T450s (Intel Core
i7-5600U, Intel HD Graphics 5500).The docking station is Lenovo's "90 W Pro
Dock", connected to a Dell UltraSharp U2913WM monitor. The laptop is configured
to ignore if the lid is closed. 

To reproduce the issue:

a) turn on laptop connected to docking station with the lid closed, and proceed
until logging into Gnome
b) "hot-undock" from the docking station and open the lid

In kernels up to 4.6.7-300 the display automatically has switched to the
laptop's.

In kernel 4.7.2-201 nothing happens and the laptop's display is dark, as if the
laptop was still trying to use the monitor connected to the docking station.

c) close the lid (this correctly does not suspend the laptop) and "hot-dock"
back to the docking station

In kernels up to 4.6.7-300 the display automatically switches back to the
external display.

In kernel 4.7.2-201 the behaviour is erratic. Sometimes it activates the
external display back, some other time it does but the resolution is wrong etc.

The Xorg packages versions are:

$ sudo dnf list installed | grep xorg
abrt-addon-xorg.x86_64                2.8.2-1.fc24                
@@commandline
xorg-x11-drv-ati.x86_64               7.6.1-3.20160215gitd41fccc.fc24
xorg-x11-drv-evdev.x86_64             2.10.3-1.fc24               
@@commandline
xorg-x11-drv-fbdev.x86_64             0.4.3-24.fc24               
@@commandline
xorg-x11-drv-intel.x86_64             2.99.917-24.20160712.fc24   
@@commandline
xorg-x11-drv-libinput.x86_64          0.19.0-2.fc24               
@@commandline
xorg-x11-drv-nouveau.x86_64           1:1.0.12-4.fc24             
@@commandline
xorg-x11-drv-openchrome.x86_64        0.5.0-1.fc24                
@@commandline
xorg-x11-drv-qxl.x86_64               0.1.4-7.fc24                
@@commandline
xorg-x11-drv-synaptics.x86_64         1.8.3-2.fc24                
@@commandline
xorg-x11-drv-vesa.x86_64              2.3.2-24.fc24               
@@commandline
xorg-x11-drv-vmmouse.x86_64           13.1.0-3.fc24               
@@commandline
xorg-x11-drv-vmware.x86_64            13.0.2-11.20150211git8f0cf7c.fc24
xorg-x11-drv-wacom.x86_64             0.32.0-2.fc24               
@@commandline
xorg-x11-font-utils.x86_64            1:7.5-31.fc24               
@@commandline
xorg-x11-fonts-Type1.noarch           7.5-16.fc24                 
@@commandline
xorg-x11-proto-devel.noarch           7.7-19.fc24                 
@@commandline
xorg-x11-server-Xorg.x86_64           1.18.4-4.fc24                @updates     
xorg-x11-server-Xwayland.x86_64       1.18.4-4.fc24                @updates     
xorg-x11-server-common.x86_64         1.18.4-4.fc24                @updates     
xorg-x11-server-utils.x86_64          7.7-19.fc24                 
@@commandline
xorg-x11-utils.x86_64                 7.5-21.fc24                 
@@commandline
xorg-x11-xauth.x86_64                 1:1.0.9-5.fc24              
@@commandline
xorg-x11-xinit.x86_64                 1.3.4-11.fc24               
@@commandline
xorg-x11-xkb-utils.x86_64             7.7-17.fc24                 
@@commandline
$ 

Other notes:
- the issue can be reproduced also starting with the laptop undocked
- when having the issue, suspending the laptop and waking it back up sends the
video to the correct display
- after having the issue, shutting down hangs on 4.7.2-201 but completes
successfully with 4.6.7-300

Sorry if I did not attach any log files etc. but I'm a noob and I wouldn't know
where to start, but please ask and I will try to provide you with what you
need.

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