[Python] Force minor tick marks on matplotlib logarithmic axes which span many orders of...

I'm trying to add minor ticks to a plot in matplotlib. The axes are logarithmic and span 8 or 9 orders of magnitude. When it spans fewer orders of magnitude, the following code works to add the minor ticks:

ax.xaxis.set_major_locator(mticker.LogLocator(numticks=999))
ax.xaxis.set_minor_locator(mticker.LogLocator(numticks=999, subs="auto"))
ax.minorticks_on()


However this stops working when the range is larger. I don't think this is a duplicate question; nothing I've read seems to work for the specific case of logarithmic axes with a large range.

How can I force minor ticks to appear on these axes? Thanks so much in advance!

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