Comment # 39 on bug 959230 from Takashi Iwai

(In reply to Toomas Aas from comment #38)
> Created attachment 762405 [details]
> Logs from booting with kernel-default-4.4.117-1.1.gd04fda6
> 
> Hi Oliver!
> 
> I installed the kernel from comment #37, but this causes a side effect. The
> graphical login screen is frozen. The mouse cursor moves, but clicking mouse
> buttons or typing on keyboard has no effect. However, I can Ctrl+Alt+F2 to
> text console and keyboard works there. But this probem means that I cannot
> do any longer term testing with this kernel.
> 
> Attached are logs from booting the new kernel and previous 4.4.114 kernel.

Hrm, there is anything wrong in the kernel logs, and it's radeon driver that
was overridden by drm-kmp, so it should be same in both cases.
In anyway, try to test with nomodeset boot option temporarily just for checking
the WiFi behavior.

Also, later on, you can try to uninstall drm-kmp-default and see whether the
graphics issue persists.  If not, you can keep it uninstalled.