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

asked 2017-07-12 11:41:34 -0500

updated 2017-07-12 12:47:58 -0500

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.

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What video driver? Do you have other desktop environments installed? if so, can you try a different one, to see. Tested on my system, nvidia proprietary, latest kernel, newest driver from nvidia, cinnamon destkop, no issues.

SteveEbey73701 gravatar imageSteveEbey73701 ( 2017-07-12 12:52:43 -0500 )edit

I haven't installed any other desktop environments. Also, exiting GNOME to go back to the GDM login screen also triggers the issue, so it's probably not a desktop environment issue.

I tried swapping GDM for LightDM; running "systemctl start lightdm.service" also triggered the issue.

Using i915 driver for intel graphics and nouveau for nvidia GTX 950M.

edit: I think it may be a Wayland issue? Setting "WaylandEnable=false" in /etc/gdm/custom.conf seems to make the issue go away.

crdominguez3 gravatar imagecrdominguez3 ( 2017-07-12 13:52:36 -0500 )edit

nvidia and nouveau both have issues with wayland. Not sure who needs to fix it, since other video drivers seem to work with wayland.

SteveEbey73701 gravatar imageSteveEbey73701 ( 2017-07-12 18:56:11 -0500 )edit