|Summary:||Opengl 3.1 setting gets lost after reboot|
|Product:||[Plasma] kwin||Reporter:||Felix Michel <felix_michel>|
|Component:||scene-opengl||Assignee:||KWin default assignee <kwin-bugs-null>|
|Latest Commit:||Version Fixed In:|
Description Felix Michel 2013-08-21 06:12:44 UTC
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.
Comment 1 Felix Michel 2013-08-21 06:22:45 UTC
*** Bug 323818 has been marked as a duplicate of this bug. ***
Comment 2 Thomas Lübking 2013-08-21 09:42:02 UTC
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 ***
Comment 3 Felix Michel 2013-08-21 09:48:53 UTC
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.
Comment 4 Thomas Lübking 2013-08-21 14:49:37 UTC
(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.