--- a/README.markdown Sat Nov 10 19:36:44 2018 -0500
+++ b/README.markdown Sun Nov 11 17:19:04 2018 -0500
@@ -458,3 +458,16 @@
Did some more Rosalind problems. One was trivial. Implemented
`longest-monotonic-subsequence` for another, which was tricky.
+
+## 2018-11-11
+
+Got the backlight control working in my Thinkpad. Had to edit
+`/etc/X11/xorg.conf.d/20-intel.conf` to contain:
+
+ Section "Device"
+ Identifier "Intel Graphics"
+ Driver "intel"
+ Option "Backlight" "intel_backlight"
+ EndSection
+
+Then reboot, and `xbacklight` would finally work.