P: Camera Raw: Canon R5 Raw images are underexposed

@andrew_rodney this is only happening with R5 raw files so I can't see how it could be GPU or ICC profile specific.

@Rikk bingo! Clearing the cache and deleting the previews folder seems to have sorted the issue, thank you.

See the Cache purge comments here: https://community.adobe.com/t5/lightroom-classic/r5-raw-pictures-turn-out-a-lot-brighter-in-lightroom-classic-10/td-p/11522079?page=1

What if you disable GPU? 

Do so in the preferences. Any better?

If not, recalibrate and build a new ICC display profile, the old one might be corrupted.

If you are using software/hardware for this task, be sure the software is set to build a matrix not LUT profile, Version 2 not Version 4 profile.

If turning OFF GPU works, it's a GPU bug and you need to contact the manufacturer or find out if there's an updated driver for it. 

The only way I can think to describe it is when LR detects a file from v9.4 it knows it should increase the brightness but then for whatever reason the fix isn't persistent.

@andrew_rodney that's not the issue. Even if I fix the brightness I still see the image get darker again when it's not selected. Watch the video and you'll see the effect, there's no way I can find to stop the brightness only being correct when the image is selected in Dev.

Readjust the brightness. Zero effect on the actual data. 

Yes, it makes no difference. Files imported into v9.4 just keep doing the flip between how they looks in 9.4 and the brighter v10 version.

Have you tried rebuilding your Preview Files in Library. 

@Rikk I've made a short video showing the effect in action. This is in the develop module, every time I switch image it first shows a darker (how it looked in v9.4 version) before jumping the brightness up for the v10 look. If it did this just the first time it wouldn't be so bad, sure we'd have to re-edit images, but the effect happens every single time I choose an image that came from v9.4, even after subsequent edits in v10. The library view also reverts to the darker version. Whilst it might fix the brightness issue from 9.4 the issues it introduces are severely affecting workflow.

https://drive.google.com/file/d/1QAtjkRzKsOamhMOZGxU2zpVxSSEdr3gN/view?usp=sharing

Sorry Rikk but it needs to be fixed because the behaviour of images brought over from v9.4 is unacceptable. When selected in the develop module they get brighter. When de-selected they darken again. This is only seen on R5 images.