This seems to trigger gnome-settings-daemon to do the following execs:
24323 execve("/usr/lib/unity-settings-daemon/usd-backlight-helper",
["/usr/lib/unity-settings-daemon/u"..., "--get-max-brightness"], [/* 47 vars
*/] <unfinished ...>
24323 <... execve resumed> ) = 0
24324 execve("/usr/lib/unity-settings-daemon/usd-backlight-helper",
["/usr/lib/unity-settings-daemon/u"..., "--get-brightness"], [/* 47 vars */]
<unfinished ...>
24324 <... execve resumed> ) = 0
24325 execve("/usr/lib/unity-settings-daemon/usd-backlight-helper",
["/usr/lib/unity-settings-daemon/u"..., "--get-brightness"], [/* 47 vars */]
<unfinished ...>
24325 <... execve resumed> ) = 0
24326 execve("/usr/lib/unity-settings-daemon/usd-backlight-helper",
["/usr/lib/unity-settings-daemon/u"..., "--get-max-brightness"], [/* 47 vars
*/] <unfinished ...>
24326 <... execve resumed> ) = 0
24327 execve("/usr/local/sbin/pkexec", ["pkexec",
"/usr/lib/unity-settings-daemon/u"..., "--set-brightness", "211"], [/* 47 vars
*/]) = -1 ENOENT (No such file or directory)
24327 execve("/usr/local/bin/pkexec", ["pkexec",
"/usr/lib/unity-settings-daemon/u"..., "--set-brightness", "211"], [/* 47 vars
*/]) = -1 ENOENT (No such file or directory)
24327 execve("/usr/sbin/pkexec", ["pkexec",
"/usr/lib/unity-settings-daemon/u"..., "--set-brightness", "211"], [/* 47 vars
*/]) = -1 ENOENT (No such file or directory)
24327 execve("/usr/bin/pkexec", ["pkexec",
"/usr/lib/unity-settings-daemon/u"..., "--set-brightness", "211"], [/* 47 vars
*/] <unfinished ...>
24327 <... execve resumed> ) = 0
24327 sendto(7, "<86>Sep 22 19:47:03 pkexec: pam_"..., 98, MSG_NOSIGNAL, NULL,
0) = 98
24327 <... readlink resumed> "/usr/bin/pkexec", 4096) = 15
24327 sendto(7, "<85>Sep 22 19:47:03 pkexec[24327"..., 182, MSG_NOSIGNAL, NULL,
0) = 182
24327 execve("/usr/lib/unity-settings-daemon/usd-backlight-helper",
["/usr/lib/unity-settings-daemon/u"..., "--set-brightness", "211"], [/* 10 vars
*/] <unfinished ...>
24327 <... execve resumed> ) = 0
The last of these uses pkexec which will trigger a new session.
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https://bugs.launchpad.net/bugs/1626651
Title:
brightness keys are handled slower in Yakkety than Xenial
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