tlp-shepherd-service tries to start bin/tlp, but looks like the binary has relocated to sbin/tlp somewhere between 1.5 and 1.8 (updated in 0b8ceaa1cd26a73059a69d8df50f5de3775eaf37).
diff --git a/gnu/services/pm.scm b/gnu/services/pm.scm
index 64b64e01fb..9b8066a38f 100644
--- a/gnu/services/pm.scm
+++ b/gnu/services/pm.scm
@@ -448,7 +448,7 @@ (define-configuration tlp-configuration
(define (tlp-shepherd-service config)
(let* ((tlp-bin (file-append
- (tlp-configuration-tlp config) "/bin/tlp"))
+ (tlp-configuration-tlp config) "/sbin/tlp"))
(tlp-action (lambda args
#~(lambda _
(zero? (system* #$tlp-bin #$@args))))))
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