https://bugs.freedesktop.org/show_bug.cgi?id=43829
--- Comment #28 from Johan Brannlund freedesktop-bugs@nullinfinity.org --- These problems seem similar to the bug I reported: https://bugs.freedesktop.org/show_bug.cgi?id=42162 . One common thread is that many of the affected machines are HP laptops. Maybe the HP ACPI implementation does something funny?