That’s how we fixed my T42 with a similar issue.

Well, until I got drunk in college and fell on it. Heat guns don’t really fix that.

Can’t really do things like that anymore (unfortunately) what with the massive heat sinks and the GPU manufacturers switching to BGA to pack more pins in

Yes, it would show up, as that's how it's rendered, artifacts and all.

Interesting argument.

In fact if the fault would lie only between screen and the 'last mile' on the GPU you would be correct. But GPUs are slightly more than simple display renderers (at least nowadays), so (vast simplification) multiple renderings happen before the actual display output is generated and sent over the wire to the display.

E.g. a failing memory on the GPU might only corrupt the output of a single window/application, since this window is using the GPU to render content, while everything else is fine.

Depends on where the hardware defect is. If the defect is before the frame buffer (shaders, triangle setup, rasterization), then yes it will show up. If it’s after the frame buffer (CRTC, resampling and DAC), then no it won’t show up.

Can you verify that it only happens on the AMD GPU, or does it happen when the system is using the Intel GPU as well?

Edit: https://bugs.webkit.org/show_bug.cgi?id=211716 and https://bugs.chromium.org/p/chromium/issues/detail?id=106817...