When using the open source radeon driver, if I disable the swapbufferswait driver option vsync does not work with kwin and I get a lot of tearing. I tried all settings in system settings -> desktop effects -> advanced -> tearing Prevention (VSync) but none eliminate tearing. (option re-use screen content does not work at all, it freezes my output, but that is another bug) I don't want to use swapbufferswait, because it forces vsync on opengl everywhere, and I like to need it to be disabled for some opengl applications (wine games). Reproducible: Always Steps to Reproduce: 1. add Option "SwapbuffersWait" "off" in device section of xorg.conf 2. start kde 3. choose system settings -> desktop effects -> advanced -> tearing Prevention (VSync) to something other than "none" or "re-use screen content" 3. move windows around Actual Results: tearing Expected Results: no tearing
Actually "Full screen repaints" work, but it is very slow (the windows lag many frames behind the mouse cursor) and therefore it is unusable. I know it is not recommended for the open source drivers.
- "Full screen repaints" is the only way to get VSync on MESA* - Only when cheap does what it says: it only syncs when you're "nearly"™ repainting the entire screen anyway (video playback) - "Re-Use screen contents" would work, but DO NOT TOUCH THAT! If you ever do, RESTART kwin afterwards (the driver will likely enter a VERY SLOW mode when attempting to read from GL_FRONT) "kwin --replace &" (thus the big, fat warning in the config dialog ;-) *unless the driver already supports GLX_EXT_buffer_age, check "glxinfo | grep GLX_EXT_buffer_age" Default should be "only when cheap", "full screen" should work, but will likely suffer from blurring.
This issue report is quite old. Can you please confirm, that it still persists with KDE 5.23?
Dear Bug Submitter, This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information as soon as possible and set the bug status as REPORTED. Due to regular bug tracker maintenance, if the bug is still in NEEDSINFO status with no change in 30 days the bug will be closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging If you have already provided the requested information, please mark the bug as REPORTED so that the KDE team knows that the bug is ready to be confirmed. Thank you for helping us make KDE software even better for everyone!
This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging Thank you for helping us make KDE software even better for everyone!