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Blank screen bug


I would like to report a bug for Debian stretch, however, I'm not sure
which package I should file the bug against. Moreover, I haven't found
a way to debug the issue either.

I've recently done a fresh installed of stretch on an HP EliteBook 840
notebook. Since then, the laptop's screen sometimes turns blank, i.e.,
as if there is no input to the screen. Strangely enough, whenever I
attach another display, the other display doesn't go blank: It's only
the internal display of the laptop itself that turns completely black.

I've tried to debug the issue by looking a various log files (e.g.,
~/.local/share/xorg/Xorg.0.log, /var/log/kern.log, running
`journalctl`), but nothing would show up in these logs whenever it
occurs. I also tried to install `firmware-linux-nonfree` but that
didn't help either. Before, I was using jessy without the bug.

I hope you can tell me which package I should file the bug to, or how
to proceed from here.