Created attachment 717662 [details]
screenshot showing distortion of graphics

+++ This bug was initially created as a clone of Bug #1029634 +++

+++ This bug was initially created as a clone of Bug #1018911 +++
## observation

On DELL Latitude E7250 after waking up the system from STR outside a docking
station with only the internal screen connected and calling `xrandr
--outpxrandr --output eDP1 --primary --auto --output DP1-1 --off; xrandr
--output eDP1 --primary --auto --output DP1-1 --auto --left-of eDP1` the screen
is distorted as shown in the attached screenshot.

## reproducible

So far this is a one time occurence.


## expected results

No graphics distortion


## further information

BIOS:
[    0.000000] DMI: Dell Inc. Latitude E7250/0TVD2T, BIOS A07 09/01/2015

kernel command line:
[    0.000000] Kernel command line: BOOT_IMAGE=/vmlinuz-4.4.49-16-default
root=/dev/mapper/system-root ro loader=syslinux quiet resume=/dev/system/swap
splash=silent quiet showopts crashkernel=103M,high crashkernel=72M,low

graphics controller:
00:02.0 VGA compatible controller: Intel Corporation Broadwell-U Integrated
Graphics (rev 09)