How to fix - (EE) intel(0)- sna_mode_shutdown_crtc- invalid state found on pipe 0, disabling CRTC-21

Oct 16, 2016

Screen sleep resulting in black screen of death (ubuntu 16.04 / intel i7 4790k / ga-z97x-ud3h-bk )

Possible fixes are:

1) restart X and loose current session

2) replace SNA with UXA and be happy foverer (best solution)

How to detect bug:

cat /var/log/Xorg.0.log

grep sna_mode_shutdown_crtc

(EE) intel(0): sna_mode_shutdown_crtc: invalid state found on pipe 0, disabling CRTC:21

How to fix:

Copy and save script above, and do:

sudo sh replace-sna-with-uxa.sh