P: Denoise - large artifacts with AMD Graphics Card

There have been many reports that the AMD version 24 drivers aren't working well with LR 13.

It may be that the version 24 AMD Adrenaline utility has started automatically applying a "gaming" profile to LR Classic. Some have reported that disabling the profile and "optimizations", restoring the default settings, lets the version 24 drivers work correctly with LR:

https://www.reddit.com/r/radeon/comments/1ad69lg/lightroom_classic_crashing_on_the_latest_driver/ https://community.adobe.com/t5/lightroom-classic-discussions/long-time-listener-first-time-caller-am... 

I also have an AMD Gpu (6800 XT) and am facing these similar issues. annoying.

A recent driver update with my daughters gaming PC (not Mac) with an AMD card altered the maximum thermal limit by around 10 degrees.  Yes, it is a touch faster now however the sound of the fans on the graphics card are like a Jet Engine now, a very poor trade off. 

Everything you have mentioned i did with Adobe.  The interesting fact is that there where zero problems with LR before the last MAC OS update/ADOBE LR update.

I have built and repaired computers for many years and in general when I see an issue like this with graphics card it is often a VRAM issue, either faulty, overheating, timings pushed too far by the driver.  The Enhance feature in LR is really pushing your GPU and it's VRAM quite hard and at the same time graphics manufacturers are always trying to leverage every

ounce of performance from products in driver updates.

You can't do much about the driver but you could try one of the following.  And yes a driver or system update can cause the power requirements to just tip the scale against you. 

Try LR settings/performance and select limit video cache, incrementally reducing it to determine if the issue disappears.  Even if your video card says you have XXGB of video memory it doesn't mean you/programs have full access or can fully utilise it.  A certain amount will be reserved, cached and all manner of things. 

If possible try running with the computer case open and see if that helps.  I know when I throw 20 images at enhance all my fans ramp up with the extra work it has to do and it's a great way to heat the room.  Many Mac's traditionally have very conservative thermal fan speed curves to preserve a quieter operational environement.

Another person reported similar artifacts with an AMD Radeon Pro 5300 with LR 13.2  / Mac OS 14.4.1 after updating both LR and Mac OS.  The sample file didn't exhibit the artifacts when processed on my own LR 13.2 / Macbook M2 Max / 14.4.1.

This is looking like a a bug in AMD's graphics drivers. AMD's recent Windows drivers have had bugs tripping up LR, and it may be that recent changes in LR's use of the GPU is tripping over them. 

Since Adobe is constantly changing the LR code that uses the GPU, you might try rolling back to an earlier version of LR (e.g. LR 13.0), to see if the issue still occurs.

Unfortunately, on Mac the only way to update the graphics driver is to wait for AMD to provide a new one to Apple and for Apple to release a new version of Mac OS (a downside of Apple's walled garden). 

I have the exact same problem, yesterday I was working with an Adobe consultant 3 hours online, he tried everything, but the problem was not solved. He said we must wait for another updates on Lrc and Camera Raw from Adobe. The denoise feature in Lrc and Camera RAW was working excellent until 2 weeks ago, before the latest Adobe updates.

I recently updated to the latest version of LR classic. Today two photos I've used denoise on have ended up with a square in the photo. Attaching images for clearer idea of the issue. Nothing has changed in my workflow other than the recent update. Using iMac macOS

Please post a system report for us, we have no technical info to go by here. Help->System Info