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Screen repeatedly powering off and on coming out of GDM lock screen (Fedora 26)

I've just installed Fedora 26 workstation edition on a new HP Envy 27-b145se. Everything functions normally AFAICT directly after boot. However, if I lock the screen (from the GNOME desktop) or let the screen become locked from inactivity, then upon waking the display repeatedly shuts off and turns on again; say, off for 2-3s and then on for <1s. Sometimes this ends up "fixing itself" after 30s or so, but sometimes it doesn't. The system is still responsive to keyboard and mouse input during this, and I can log in, open a terminal, and reboot to fix the issue.

I can also trigger the issue by just hitting Super-P in GNOME.

Screen repeatedly powering off and on coming out of GDM lock screen (Fedora 26)

I've just installed Fedora 26 workstation edition on a new HP Envy 27-b145se. Everything functions normally AFAICT directly after boot. However, if I lock the screen (from the GNOME desktop) or let the screen become locked from inactivity, then upon waking the display repeatedly shuts off and turns on again; say, off for 2-3s and then on for <1s. Sometimes this ends up "fixing itself" after 30s or so, but sometimes it doesn't. The system is still responsive to keyboard and mouse input during this, and I can log in, open a terminal, and reboot to fix the issue.

I can also trigger the issue by just hitting Super-P in GNOME.

edit: I can also cause the flashing to stop by hitting Ctrl-Alt-F3 to switch to a non-graphical tty. Also, every time the screen flashes these messages get posted to dmesg:

[drm] Reducing the compressed framebuffer size. This may lead to less power savings than a non-reduced-size. Try to increase stolen memory size if available in BIOS.

Adding "i915.enable_fbc=0" to my kernel parameters at startup silences these log messages but does not fix the flashing.