323817 2013-08-21 06:12:44 +0000 Opengl 3.1 setting gets lost after reboot 2013-08-21 14:49:37 +0000 1 1 4 Plasma kwin scene-opengl 4.11.0 Arch Linux Linux RESOLVED DUPLICATE 322060 NOR normal --- 0 felix_michel kwin-bugs-null 0 oldest_to_newest 1391416 0 felix_michel 2013-08-21 06:12:44 +0000 When I set compositing to opengl 3.1 i have no tearing and kwin is fast and slick. when i reboot i have some tearing and kwin is little bit slower, still fast. the problem is the tearing when scrolling or watching a full screen flash video. it seems that after the reboot the settings are changed back to opengl 2.0. I have an nvidia graphics card. Reproducible: Always Steps to Reproduce: 1. Set compositing type to opengl 3.1, no tearing 2. Reboot Actual Results: after reboot there is again tearing. Expected Results: the compositing type opengl 3.1 should be activated also after reboot. 1391422 1 felix_michel 2013-08-21 06:22:45 +0000 *** Bug 323818 has been marked as a duplicate of this bug. *** 1391453 2 thomas.luebking 2013-08-21 09:42:02 +0000 This has nothing to do with the GL version (if actually reset that's either due to HW support or a different bug) but a problem to reliably detect the availability of triple buffering. see dupe. *** This bug has been marked as a duplicate of bug 322060 *** 1391457 3 felix_michel 2013-08-21 09:48:53 +0000 well, what i dont get then why do i have a performance and a tearing difference? no tearing if i reset the opengl option, but the tearing is present again when i reboot. 1391545 4 thomas.luebking 2013-08-21 14:49:37 +0000 (In reply to comment #3) > well, what i dont get then why do i have a performance and a tearing > difference? Did you read across the dupe? In a nutshell: triple buffering is (likely) misdetected during login. Without either it or usleep yielding, swapping causes high cpu load, so it's forcefully deactivated. W/o triple buffering, also chances raise to drop or miss a frame (because we stay in event processing as long as possible) and the event processing time naturally shortens as well -> seems slower. -> Ensure to activate triple buffering and override the detection.