Can duplicate on a Dell Precision m5510 with a Intel HD Graphics 530 and an NVidia Quadro M1000M running Ubuntu 16.04.
Output of uname -a:
Linux arbitrarly 4.6.2-040602-generic #201606072312 SMP Wed Jun 8 03:14:36 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
Kernel 4.6.2 is in use because of problems with 4.4.0 and Intel graphics.
The same workaround (scaling the external display independently) corrects the issue for me.
Can duplicate on a Dell Precision m5510 with a Intel HD Graphics 530 and an NVidia Quadro M1000M running Ubuntu 16.04.
Output of uname -a:
Linux arbitrarly 4.6.2-040602- generic #201606072312 SMP Wed Jun 8 03:14:36 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
Kernel 4.6.2 is in use because of problems with 4.4.0 and Intel graphics.
The same workaround (scaling the external display independently) corrects the issue for me.