Disabling Hardware Acceleration and Anti-Alaising see a notable decrease in CPU usage; it still spikes but doesn't bring my system to a crawl.
Notably: This may be tied to the NVIDIA PowerMizer settings. So when you're in "Adaptive" mode, it's supposed to spool up the clock speed on the card when the power is needed. It looks to me like the "marching ants" selection is taxing on the GPU, but PowerMizer often fails to increase the card's clock speed when it's taxed by LibreOffice. What I'm finding is: + If do something else that taxes the GPU, like initiate a transparent window somewhere, PowerMizer increases the clock speed, and LibreOffice begins performing better + If I set PowerMizer to "Maximum Performance" rather than adaptive, the problem goes away. (however, Xorg still uses about 33% CPU whenever the marching ants are present) I have not had a chance to try the nouveau drivers yet. Do you think it's worth a continued investigation, or does this sound like an NVIDIA bug? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1001550 Title: LibreOffice Calc causes high CPU usage in Xorg when displaying "marching ants" To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libreoffice/+bug/1001550/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
