I moved from PowerPoint to Impress. Unfortunately there are graphical bugs in Impress on the presentation display when using my 2K external display as output(a big white rectangle and black bars). When the high-res display is the student view and the FullHD laptop panel is the presentation view everything works wonderful. Reinstalling, rebooting, using other cables as well as plugging everything in and out multiple times did not help. The normal desktop mode works well and powerpoint has no problems in this scenario. Even using a different laptop did not help. I tried it with my Thinkpad T580 and with a Dell Precision 7730 as well. It doesn't matter whether the internal or the external graphics card is used. The display is connected via DisplayPort. Turning CL off / on did not help. Specifications of a Dell M6800 with this problem: LibreOffice 6.1.4.2 x64; UI-Render: Standard, CPU-Threads: 8, Calc: CL Windows 10 Pro 64 Bit Build 17763.195 (1809) 32 GB RAM / 16 GB video shared NVIDIA Quadro K3100M Driver Build 412.16 external display: Samsung S27D850T Images: https://postimg.cc/gallery/irqou9fi/ I will provide logs, if you tell me how to do that for Impress.
Any better if you disable OpenGL rendering AND Hardware Acceleration to just display using CPU for rendering? It will be dog slow, but should not tear or corrupt the 2K/4K external. Anyway, seems a dupe of bug 40534 *** This bug has been marked as a duplicate of bug 40534 ***
Thank you for the quick response. The fact that this bug still exists is a little bit scary, because it looks like it was reported 8 years ago.