Description of problem: The LightDM login screen only shows active control after the screensaver closes; the rest of the display is black. This is on a multiseat system with three external AMD video cards and the one built-in Intel one. The AMD GPUs show the login screen correctly. Version-Release number of selected component (if applicable): xorg-x11-drv-intel-2.99.917-20.20160119.fc23.x86_64 (rebuilt from koji) How reproducible: Always Steps to Reproduce: 1. Boot system 2. Wait for xscreensaver to activate 3. Move mouse or press key on keyboard Actual results: Screen is completely black except the active control. If you type in your username, and press tab, the next control also appears. Switching to Ctrl-Alt-F2, and then back to Ctrl-Alt-F1 fixes it as well. Expected results: Login screen appears properly Additional info: I'm using a koji build because I can't get DRI2 working while the external video cards are plugged in. DRI3 works perfectly except for this glitch. I have seen this happen on a single-seat system that we have that only has an Intel display. FWIW, we're using LightDM as our display manager because it allows us to run xscreensaver, and we're using lightdm-kde-greeter as our greeter. I've tried rebuilding xorg-x11-drv-intel-2.99.917-15.20150729.fc23.x86_64 with DRI3 enabled, and it has the same problem. Our old fully updated F21 systems did not have this problem, but I've run into compile errors trying to build anything older for F23.
Created attachment 1128217 [details] Picture of black screen
Created attachment 1128218 [details] Picture of black screen next to working screen from same system
Created attachment 1128219 [details] Xorg log
After spending some time trying to debug this, it appears that the driver isn't honoring the VisibilityNotify event: VisibilityNotify event, serial 16, synthetic NO, window 0x1800001, state VisibilityUnobscured Expose event, serial 16, synthetic NO, window 0x1800001, (0,0), width 178, height 10, count 3 Expose event, serial 16, synthetic NO, window 0x1800001, (0,10), width 10, height 58, count 2 Expose event, serial 16, synthetic NO, window 0x1800001, (68,10), width 110, height 58, count 1 Expose event, serial 16, synthetic NO, window 0x1800001, (0,68), width 178, height 110, count 0 ---> Screensaver kicks in VisibilityNotify event, serial 28, synthetic NO, window 0x1800001, state VisibilityFullyObscured ColormapNotify event, serial 28, synthetic NO, window 0x1800001, colormap 0x22, new NO, state ColormapUninstalled ---> Mouse is moved ColormapNotify event, serial 28, synthetic NO, window 0x1800001, colormap 0x22, new NO, state ColormapInstalled VisibilityNotify event, serial 28, synthetic NO, window 0x1800001, state VisibilityUnobscured ---> Login screen should be shown now, but display is completely black Expose event, serial 28, synthetic NO, window 0x1800001, (0,0), width 178, height 10, count 3 Expose event, serial 28, synthetic NO, window 0x1800001, (0,10), width 10, height 58, count 2 Expose event, serial 28, synthetic NO, window 0x1800001, (68,10), width 110, height 58, count 1 Expose event, serial 28, synthetic NO, window 0x1800001, (0,68), width 178, height 110, count 0 ---> Username box is now showing
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