Hello, I have a new laptop with a 7840U and am running into the same problem on kernel 6.10.11 and 6.11.0. My symptoms are slightly different, in that video played through Firefox works for some period before eventually having a GPU crash. This can be anywhere from seconds to 10+ minutes, though I don't think it has ever passed 20min of playback.
Please let me know what info I can provide to help with root cause analysis. Regards, James
