Comment # 12 on bug 1170501 from Dmitry Bot

So...
After month usage this error repeated only when:

- Charger disconnected and laptop working from battery;
- Close lib and laptop goes to sleep;
- Connect charger;
- Open lib and login in XFCE ->> black screen;
- Close lib and open - lighting screen.
- And in Xorg.0.log I see only error:

(EE) intel(0): sna_mode_shutdown_crtc: invalid state found on pipe 0, disabling
CRTC:51

And yes,I see the same issues with Intel and modesetting driver.