drm: Primary display is recognized as secondary display

[Hisao Tanabe]

On Mon, May 22, 2017 at 09:22:03AM +0100, Chris Wilson wrote:
> On Sat, May 20, 2017 at 10:02:32PM +0900, Hisao Tanabe wrote:
> > DELL 27-inch display is connected to ThinkPad 250 via DisplayPort cable,
> > and DELL 27-inch display is used as primary display.
> > 
> > After upgrade kernel from 4.10 to 4.11, the DELL 27-inch display is now
> > recognized as a secondary display.
> 
> What's primary and secondary? Do you mean X's RandR PrimaryOutput, or
> the layout, both of which are provided by userspace. I suspect what you
> mean is that the connectors were relabelled, so the output from
> before/after xrandr might help to clarify that.

I use Fedora 25 GNOME 3.

== Kernel 4.11

1) The output of the xrandr command before changing the display setting
is as follows.

$ xrandr
Screen 0: minimum 8 x 8, current 4480 x 1440, maximum 32767 x 32767
eDP1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 280mm x 160mm
   1920x1080     60.04*+
   1400x1050     59.98
   1600x900      60.00
   1280x1024     60.02
   1280x960      60.00
   1368x768      60.00
   1280x720      60.00
   1024x768      60.00
   1024x576      60.00
   960x540       60.00
   800x600       60.32    56.25
   864x486       60.00
   640x480       59.94
   720x405       60.00
   640x360       60.00
DP1 connected 2560x1440+1920+0 (normal left inverted right x axis y axis) 600mm x 340mm
   2560x1440     59.95*+
   1920x1200     59.88
   1920x1080     60.00    60.00    50.00    59.94    24.00    23.98
   1920x1080i    60.00    50.00    59.94
   1600x1200     60.00
   1680x1050     59.95
   1280x1024     75.02    60.02
   1280x800      59.81
   1152x864      75.00
   1280x720      60.00    50.00    59.94
   1024x768      75.03    60.00
   800x600       75.00    60.32
   720x576       50.00
   720x480       60.00    59.94
   640x480       75.00    60.00    59.94
   720x400       70.08
DP2 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)


2) Change display settings using 'gnome-control-center display'.

- Set the DELL 27-inch display to primary (Primary means "Show the top
  bar and Activities Overview on this display").

- Set the Built-in display to secondary display (Secondary Display means
  "Join this display with another to create an extra workspace").

- Arrange Combined Displays.

3) The output of the xrandr command after changing the display setting
is as follows.

$ xrandr
Screen 0: minimum 8 x 8, current 2560 x 2520, maximum 32767 x 32767
eDP1 connected 1920x1080+312+1440 (normal left inverted right x axis y axis) 280mm x 160mm
   1920x1080     60.04*+
   1400x1050     59.98
   1600x900      60.00
   1280x1024     60.02
   1280x960      60.00
   1368x768      60.00
   1280x720      60.00
   1024x768      60.00
   1024x576      60.00
   960x540       60.00
   800x600       60.32    56.25
   864x486       60.00
   640x480       59.94
   720x405       60.00
   640x360       60.00
DP1 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 600mm x 340mm
   2560x1440     59.95*+
   1920x1200     59.88
   1920x1080     60.00    60.00    50.00    59.94    24.00    23.98
   1920x1080i    60.00    50.00    59.94
   1600x1200     60.00
   1680x1050     59.95
   1280x1024     75.02    60.02
   1280x800      59.81
   1152x864      75.00
   1280x720      60.00    50.00    59.94
   1024x768      75.03    60.00
   800x600       75.00    60.32
   720x576       50.00
   720x480       60.00    59.94
   640x480       75.00    60.00    59.94
   720x400       70.08
DP2 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

4) The output of the xrandr command after reboot the machine is as follows.
This is same output 1). The 2) setting is not saved.

$ xrandr
Screen 0: minimum 8 x 8, current 4480 x 1440, maximum 32767 x 32767
eDP1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 280mm x 160mm
   1920x1080     60.04*+
   1400x1050     59.98
   1600x900      60.00
   1280x1024     60.02
   1280x960      60.00
   1368x768      60.00
   1280x720      60.00
   1024x768      60.00
   1024x576      60.00
   960x540       60.00
   800x600       60.32    56.25
   864x486       60.00
   640x480       59.94
   720x405       60.00
   640x360       60.00
DP1 connected 2560x1440+1920+0 (normal left inverted right x axis y axis) 600mm x 340mm
   2560x1440     59.95*+
   1920x1200     59.88
   1920x1080     60.00    60.00    50.00    59.94    24.00    23.98
   1920x1080i    60.00    50.00    59.94
   1600x1200     60.00
   1680x1050     59.95
   1280x1024     75.02    60.02
   1280x800      59.81
   1152x864      75.00
   1280x720      60.00    50.00    59.94
   1024x768      75.03    60.00
   800x600       75.00    60.32
   720x576       50.00
   720x480       60.00    59.94
   640x480       75.00    60.00    59.94
   720x400       70.08
DP2 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)


This odd behavior not occur in the 4.10 kernel.

Thanks.