Problem with Blender 4.1 - program hangs up frequently

[thezacho]

Hy,

I run Ubuntu 20.04.6 LTS on a PC an with Intel® Core™ i5-7400 CPU @ 3.00GHz × 4 and a Mesa Intel® HD Graphics 630 (KBL GT2) / AMD® Redwood.

Many times when I use Blender, the program suddenly hangs up and I can't do anything anymore. When I launch the System Monitor I see, that one of the four processor cores runs at 100%, all the other three are running low. I can't do anything but stall the application and start it again.

It doesn't really depend on how big the Blender file is, it happens quite randomly, as I see it.

Can anybody help, what the problem could be?

Thanks in advance.

Cheers Michael

[thegribble]

I'm having the same problem - hangs almost immediately with one core at 100% when I load a scene, never recovers. i3-8130U CPU x 4 and Intel UHD graphics 620 so maybe a graphics driver issue?
I have dual boot on here and can confirm that blender 4.1 works fine under Windows on the same laptop without the same issue.

[cyrgui]

Same for me, hangs almost immediately on my laptop Lenovo Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz Ubuntu 22.04.4 LTS with 16 Go Ram. Blender 3.x was working fine.

[thegribble]

Found the answer, I think, courtesy of this post: https://askubuntu.com/questions/1477...55b9748f66e1c0

First you change a driver parameter, then run blender with an environment variable set. needs to be done every boot so I put these two commands in a shell script:

$ echo 10000 | sudo tee /sys/class/drm/card0/engine/rcs0/preempt_timeout_ms
$ INTEL_DEBUG=reemit blender

[cyrgui]

Thank's ! It works great, I hope dev will incorpore this in a release...