Thank you for your comment. I think I will switch to nvidia graphics card. I have not had any problems with any game or program. Outside the blender. Format or a new system might solve my problem.

It's not just the lack of Line Style. I've tried to reproduce it on the default cube file and I can't even on 2.93.1.

Here's a simple example file showing how to force all render handlers onto the main thread:

That is true, but the fact that this is limited to the GPU rendering, results in graphic glitches and affects many Blender versions, makes it likely that this is a problem with your graphics driver or GPU.

this would be massive killer UI feature ,and should be shipped with 3.0.

Yes, because driver selection "recommended only" is selected. "Optional drivers" can be problematic. I usually wait for it to be approved by amd. I've been constantly updating my drivers for 2 years. I couldn't see anything big in the 21.7.1 Cycles does this only when using its own unique features. He doesn't do it in joint materials with Eevee. I think the problem is with cycles. But most people don't have this problem. I guess it's something to do with my computer.

Thanks for clarification, will merge with T89391.

Please provide sample file where this issue can be reproduced. Also in Blender click on Help > Report a Bug and update report description with system info and blender version

User preferences are not stored in saved .blend file. Unless I don't understand issue you are reporting

whenever i use rip tool i am getting error "rip error"

Thanks for the report. I think you have tried to use rip tool on the edge/verts which has only one face connected. And it's known limitation.

Caused by rB3b6ee8cee708: Refactor: Move vertex group names to object data. Recent regression so marking this a high priority issue.

No activity for more than a week. As per the tracker policy we assume the issue is gone and can be closed.

Broken: version: 2.83.4, branch: master, commit date: 2020-08-05 06:00, hash: rBc113af82881a

Thanks for the report. Can you please try again with fresh builds? (https://builder.blender.org/download/daily).

@Miguel Garcia (mikeblueg) , thanks for the report. Reported issue is duplicate of T88766: EEVEE: Specular BSDF incompatible with Shader to RGB when SSR is active..

Are you adding files from local or network drive?

Pushed additional fixes.

@Sybren A. Stüvel (sybren) Hi Sybren. I agree that using pointers for out parameters can enhance readability. I went ahead and made the change throughout the code. For the particular example you cited:

Updated with latest requested changes.

It looks like this function implements mesh copying from scratch.
I don't have time to test right now, but a quick fix is probably adding these lines to BKE_mesh_nomain_to_mesh:

Can confirm. Possibly the culprit commit is rB3b6ee8cee7080af200e25e944fe30d310240e138 but will double check.

I checked, and it still doesn't work, a clue i spotted to when it's malfunctioning is that when separating by materials, some objects disapear or change their materials to none, like in this mercedez where the door seems to be with no materials, and it looks like it only happens on the objects that are related to tohers, like the ones that are mirrerored (mirrors, doors, parts of the chassi, etc.)

I ran into this problem today by accident. I have:
Ryzen 3400g
16 (2x8Gb) RAM

In T90047#1195552, @Brecht Van Lommel (brecht) wrote:

This was fixed already in master / 3.0, it's a matter of time before the fix makes it into the next 2.93 LTS release,

Caused by rB0e0ebdb65c978a22db2bdcc71dd058ec89cac932