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If you have released an unknown key on your system for which the 0x81 code is set, this article should help you fix the problem.
Updated
My /var/log/kern.log and dmesg related output are full of noises, for example:
[17236124.064000] atkbd.c: Unknown key released (translated sentence only, code 0x81 on isa0060 / serio0).
[17236124.064000] atkbd.c: use “setkeycodes e001
[17236127.616000] atkbd.c: Unknown key pressed (sentence 2 translated, rule 0xd9 to isa0060 / serio0).
[17236127.616000] atkbd.c: use “setkeycodes e059
[17236140.676000] atkbd.c: unknown key pressed (sentence 2 translated, encoding 0xd9 in isa0060 / serio0).
[17236140.676000] atkbd.c: use “setkeycodes e059
[17236162.472000] atkbd.c: Unknown vital impulse (sentence 2 translated, code 0xd9 regarding isa0060 / serio0).
[17236162.472000] atkbd.c: use ‘setkeycodes e059
[17236168.856000] atkbd.c: Transfer unknown key (sentence 2 translated, code 0xd9 directly to isa0060 / serio0).
[17236168.856000] atkbd.c: use “setkeycodes e059
[17236172.636000] atkbd.c: unknown key underlined (sentence 2 translated, code 0xd9 to isa0060 / serio0).
[17236172.636000] atkbd.c: Use “setkeycodes e059
Due to e It is tedious to diagnose obvious kernel bugs, since real bugs are always masked by these unnecessary messages. Summer
This is a very well-known issue for a long time (since Linux 2.6 I think), but that’s okay, I haven’t fixed it!
Updated
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The last time I saw this failure was due to my Microsoft mobile keyboard sending power status messages. A similar issue has been reported in Bugzilla Fedora, and the issue has surfaced repeatedly on the Ubuntu forums.
DJ YB Unbekannter Schlüssel Freigegeben übersetzt Satz 2 Code 0x81 Ein
Chiave Sconosciuta Rilasciata Tradotto Set 2 Codice 0x81 Attivato
Onbekende Sleutel Vrijgegeven Vertaald Set 2 Code 0x81 Aan
Clé Inconnue Publiée Ensemble Traduit 2 Code 0x81 Activé
Liberação De Chave Desconhecida Traduzida Do Conjunto 2, Código 0x81 Ativado
알 수 없는 키 릴리스 번역된 세트 2 코드 0x81 켜기
Okänd Nyckel Släppt Översatt Set 2 Code 0x81 On
Nieznany Klucz Zwolniony Przetłumaczony Zestaw 2 Kod 0x81 Włączony
Неизвестный ключ освобожден переведен код набора 2 0x81 включен
Clave Desconocida Liberada Conjunto Traducido 2 Código 0x81 Activado
