Add notes about USB-C and Debian Bookworm

diff --git a/linux/usb-c-debian-bookworm.md b/linux/usb-c-debian-bookworm.md
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+When using a laptop with display through USB-C and Debian Bookworm, you can get black screens sometimes.
+`dmesg` shows errors when this happens.
+Using the kernel from backports addresses the issue.
+(However, note that firmware packages are different in backports, so you might need to pull more firmware packages from backports to keep wireless networking.)