How would I do I line chart of raw unsummarized values?

[MDKCLIRResearch]

I have data source with unsummarized values.  I have no need to summarize this data.  I want to do a line plot of the unsummarized values.

Is this possible in Power BI?

Power BI assumes that I want to aggregate everything.  This makes no sense to me.

[Syndicate_Admin]

It will not do anything to X but will automatically summarize the points of Y, whose interest is to show them all.

[AlexisOlson]

If you have unique y-values for each x-value, then summarization (MIN/MAX/SUM/AVERAGE) doesn't really do anything to your data and it should plot fine. If you have multiple y-values for each x-value, then that can't be a single line anyway.

[MDKCLIRResearch · Accepted solution]

This is a solution.  It's unfortunate that you have to add a column MAX([Reading],0) to get a line plot to work.  (Since my reading is a logarithmic scale, this will work).  

I don't typically start by applying aggregates.  Aggregates have a tendency to obfuscate the very signals that you may be looking for.