GNOME Bugzilla – Bug 791962
Screen goes blank three times when logging in for the first time after a reboot
Last modified: 2018-04-28 23:35:38 UTC
While Gnome is starting up, the screen turns off for a second, then turns back on for a couple seconds, then turns off again like that two more times. See the video here: https://www.dropbox.com/s/p43356vclygpyw6/2017-12-26%2015.02.23.mp4?dl=0 This affects every user account, not just my regular one. If I log out and then log in again (even as a different user), everything works fine; the problem occurs only the first time after a reboot. Also, it only happens in a Wayland session, not an X11 one. It looks like it has something to do with reconfiguring the monitor rather than turning it off: if I press Super to open the app overview, it gets dismissed when the screen turns off. I'm running Fedora 27 on a Dell Latitude E7470.
Oh wow, just discovered something after starting the X11 session. Gnome thinks I have a second monitor attached (which I don't). I can move the mouse to the right, off the screen; window context menus have a "Move to Monitor Right" option, and "xrandr" shows the following: $ xrandr Screen 0: minimum 320 x 200, current 2944 x 1080, maximum 8192 x 8192 eDP-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 309mm x 174mm 1920x1080 60.02*+ 47.99 1400x1050 59.98 1280x1024 60.02 1280x960 60.00 1024x768 60.04 60.00 960x720 60.00 928x696 60.05 896x672 60.01 800x600 60.00 60.32 56.25 700x525 59.98 640x512 60.02 640x480 60.00 59.94 512x384 60.00 400x300 60.32 56.34 320x240 60.05 HDMI-1 disconnected (normal left inverted right x axis y axis) DP-1 disconnected (normal left inverted right x axis y axis) HDMI-2 disconnected (normal left inverted right x axis y axis) DP-1-1 disconnected (normal left inverted right x axis y axis) DP-1-2 disconnected (normal left inverted right x axis y axis) DP-1-3 connected 1024x768+1920+0 (normal left inverted right x axis y axis) 530mm x 290mm 1024x768 60.00*+ 75.03 1280x1024 75.02 60.02 800x600 75.00 60.32 640x480 75.00 59.94 720x400 70.08 (My laptop only has two connectors, by the way: HDMI and DP.)
The Gnome display settings are showing a non-existent monitor, Synaptics Inc 24". That led to me this bug report in Ubuntu: https://bugzilla.gnome.org/show_bug.cgi?id=791962. Surprisingly, it was reported on the same hardware, Latitude e7470.
I've tried using an older kernel and even downgrading the BIOS - but that made no difference. If I start Xorg on its own, the non-existent monitor does not show up. However, if I run startx (which ends up starting Gnome), the problem does happen. So it sounds like it is actually Gnome that's somehow creating a fake monitor. Any other info I could provide?
I have the same problem. Under wayland it turns three times black. With X11 sometimes it turns black once. I also see the "second" screen with xrandr. I noticed under wayland that if an external screen is connected to my Dell e7470 it removes the screen in gnome and reattaches it. this happens everytime it turns black. I know for sure that with the default packages (no updates installed) it is not happening, so it must be some packages. Unfortunately I cannot limit it to certain packages. I also recognized that sometime when fedora is installing packages it also turns black multiple times. I also updated the BIOS of my laptop, but it didn't help. The second screen under x11 is even more annoying then the black screens at the beginning in a wayland session, because some apps spawn und the second screen.
today I recognized that also under the wayland session it creates a second screen. After the three black screens this one is gone. ➜ ~ xrandr Screen 0: minimum 320 x 200, current 2944 x 1080, maximum 8192 x 8192 XWAYLAND0 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 310mm x 170mm 1920x1080 59.96*+ XWAYLAND1 connected 1024x768+1920+0 (normal left inverted right x axis y axis) 0mm x 0mm 1024x768 59.92*+ ➜ ~ xrandr Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192 XWAYLAND0 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 310mm x 170mm 1920x1080 59.96*+
Apparently, the fake screen shows up in Color settings, too. It's called "PnP montor Monitor". Notice the "montor" - what is that? A typo? A Google search for "PnP montor" produces weird results mentioning a displayport splitter.
Created attachment 369139 [details] Screenshot of the color profile Hopefully there's some useful information here? (Btw, the colors in the screenshot are wrong - the selection is actually blue, not orange. No idea how it's even possible, but the irony of a color profile dialog messing up colors in the screenshot is not lost on me.)
I've upgraded to Fedora 28, and the bug went away - so I'm closing this.