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0f7b58d
(Get the code!)
@Kai-Heng
Here are the test results when starting the kernel with "blacklist=nouveau modprobe.
The Dell XPS 9560 is connected to Dell Thunderbolt Dock TB16 with the external monitor and the external keyboard being connected to the docking station.
Short answer:
v4.12-rc1 -> Successfully logged in.
v4.12-rc2 -> Successfully logged in.
v4.12-rc5 -> Successfully logged in. (This is the only one without negative side effects as explained with the long answer below.)
4.10.0-35-generic -> Successfully logged in.
Long answer:
The side effects observed are likely not all related to this particular bug but I mention them here for completeness.
v4.12-rc1 -> Login scree is displayed on the laptop screen but not on the external screen. Note, up to this point of booting, the laptop was closed. After opening the laptop I can see the login screen. Regardless whether the laptop is closed I can use the external keyboard to successfully login. However from this point onwards (after login) the external keyboard stops working (while connected to the docking station). I can then only use the laptop's built in keyboard. Furthermore, the screen resolution on both screens is very low (i.e. 1600x900) whereas it should be 3840x2160 as configured on my laptop.
v4.12-rc2 -> Same behaviour as with v4.12-rc1 and 4.10.0-35-generic
v4.12-rc5 -> As far as I can tell everything works fine with my setup. The login screen is displayed on the external monitor and has not activated the built in monitor while the laptop is closed. It is using the correct screen resolution of 3840x2160 and the external keyboard continuous to work after login.
4.10.0-35-generic -> Same behaviour as with v4.12-rc1, v4.12-rc2