I think the issue stems from firmware. When I run update-initramfs, I get this message:
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update-initramfs: Generating /boot/initrd.img-4.16.0-2-amd64
W: Possible missing firmware /lib/firmware/i915/skl_dmc_ver1_27.bin for module i915
W: Possible missing firmware /lib/firmware/i915/kbl_dmc_ver1_04.bin for module i915
W: Possible missing firmware /lib/firmware/i915/kbl_guc_ver9_39.bin for module i915
W: Possible missing firmware /lib/firmware/i915/bxt_guc_ver9_29.bin for module i915
W: Possible missing firmware /lib/firmware/i915/skl_guc_ver9_33.bin for module i915
update-initramfs: Generating /boot/initrd.img-4.16.0-1-amd64
W: Possible missing firmware /lib/firmware/i915/skl_dmc_ver1_27.bin for module i915
W: Possible missing firmware /lib/firmware/i915/kbl_dmc_ver1_04.bin for module i915
W: Possible missing firmware /lib/firmware/i915/kbl_guc_ver9_39.bin for module i915
W: Possible missing firmware /lib/firmware/i915/bxt_guc_ver9_29.bin for module i915
W: Possible missing firmware /lib/firmware/i915/skl_guc_ver9_33.bin for module i915
update-initramfs: Generating /boot/initrd.img-4.15.0-3-amd64
I tried getting the .bin files from kernel.org, as this answer describes. It gets rid of the errors that update-initramfs throws, but doesn't solve the problem.
I have firmware-linux-nonfree and firmware-misc-nonfree installed.
Thank you!