[Libreoffice-bugs] [Bug 40534] slide tearing or not shown in LARGE screens (high resolution) with hardware acceleration enabled

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=40534

--- Comment #76 from craig at arno.com <craig at arno.com> ---
Verified bug still exists in LO 6.1.3.2 (x64)

Machine:
 Windows 10 professional
 Surface Book 3000x2000 (4K) display 150%, i7-6600U, 16GB RAM, 1TB SSD
 External (presentation) monitor connected through display port running in
2160p mode 43" (4K)59Hz 100% scaling (4096 x 2160)

Transitioning from "use hardware acceleration" to not, impress "blew up" 2-3
times transitioning from slide 3->4, does not produce a crash file, does
"recover" when restarted.

Attempts to reproduce "crash" failed after the first 2-3 attempts.  This was
from a "cold" LO start, one run with HW acceleration, then disable HW
acceleration and run presentation again.  Point being, don't rely on Impress
working with HW Acceleration disabled at 4K resolutions.  It may crash a few
times.

With HW acceleration enabled screen paint is very slow followed by a
blanking/tearing of the presentation screen immediately after screen paint
completes.

After "crashing" behavior stopped (3-4 tries), I was able to make it through
the entire presentation, with excruciatingly slow screen paint speeds.

Positive comment: Once the screen is rendered, the image is beautiful.  I have
one animated slide in this presentation which works properly even without
acceleration.

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