Created attachment 1177380 [details] Xorg log Description of problem: The screen flashes on ThinkPad x260 (skylake HD 520 graphics) on Fedora 24 (kernel 4.6.3-300.fc24.x86_64). For example, in Firefox if I go to bugzilla.redhat.com immediately after the page has loaded it flashes with black color the borders of the window (but not every time). Also if I resize emacs-nox in gnome-terminal it flashes. Sometimes the whole gnome-shell flashes, too (i'm using gnome as my DE). But the same flashing happens also in i3 window manager. Version-Release number of selected component (if applicable): xorg-x11-drv-intel-2.99.917-23.20160512.fc24.x86_64 How reproducible: Gnome shell flashes once in about every 5-10 minutes when firefox is open. When firefox is not open it's not flashing so much (not 100% sure about this). Firefox flashes about every 3rd time when loading, for example, bugzilla.redhat.com Steps to Reproduce: 1. Use the system with firefox opened or 2. Resize (up and down and to all directions) gnome-terminal when it's running emacs-nox Actual results: Screen flashes Expected results: No flashing Additional info: I'm not sure if the problem is exactly in xorg-x11-drv-intel. The problem is also in wayland gnome.
Tested also with the latest rawhide kernel, version 4.7.0-0.rc6.git0.1.fc25.x86_64. The problem still persists.
When I run the default installed program "glxgears" like this: "$ vblank_mode=0 glxgears" I get no screen flashing / tearing in the application window. And when I run the program without the vblank_mode=0 I get again tearing in the application window. The cpu is just used much more when the vblank_mode is set to 0.
I deleted the xorg-x11-drv-intel package from my system and rebooted, and so the problem still persists. So this is not xorg-x11-drv-intel package problem? What it might be?
I have a new Thinkpad L460 with the same issue. Screen is flickering randomly. The flickering looks like horizontal lines. Intel(R) Core(TM) i3-6100U CPU @ 2.30GHz Intel(R) HD Graphics 520 (Skylake GT2)
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Fedora 24 changed to end-of-life (EOL) status on 2017-08-08. Fedora 24 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. If you are unable to reopen this bug, please file a new report against the current release. If you experience problems, please add a comment to this bug. Thank you for reporting this bug and we are sorry it could not be fixed.