Comment # 40 on bug 959230 from Takashi Iwai

(In reply to Takashi Iwai from comment #39)
> (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.

The crash with drm-kmp turned out to be the side-effect of the recent fix for
Spectre.  It's being tracked down.  Right now for testing, please disable KMS
via nomodeset option or uninstall drm-kmp-default temporarily to go back to the
4.4.x radeon driver.