Public bug reported:
libhybris_0.1.0+git20131207+e452e83-0ubuntu17 includes a test program
that uses the light sensors (for light notifications), but it fails to
run as phablet user, as it lacks the needed permissions in
/sys/class/leds.
The test works fine as root, and strace shows the files that the lights HAL
tries to access:
open("/sys/class/leds/red/brightness", O_RDWR|O_LARGEFILE) = 3
close(3) = 0
open("/sys/class/leds/green/brightness", O_RDWR|O_LARGEFILE) = 3
close(3) = 0
open("/sys/class/leds/blue/brightness", O_RDWR|O_LARGEFILE) = 3
close(3) = 0
open("/sys/class/leds/red/device/lock", O_RDWR|O_LARGEFILE) = 3
write(3, "1\n", 2) = 2
close(3) = 0
open("/sys/class/leds/red/brightness", O_RDWR|O_LARGEFILE) = 3
write(3, "255\n", 4) = 4
close(3) = 0
open("/sys/class/leds/green/brightness", O_RDWR|O_LARGEFILE) = 3
write(3, "255\n", 4) = 4
close(3) = 0
open("/sys/class/leds/blue/brightness", O_RDWR|O_LARGEFILE) = 3
write(3, "255\n", 4) = 4
close(3) = 0
open("/sys/class/leds/red/device/grpfreq", O_RDWR|O_LARGEFILE) = 3
write(3, "60\n", 3) = 3
close(3) = 0
open("/sys/class/leds/red/device/grppwm", O_RDWR|O_LARGEFILE) = 3
write(3, "170\n", 4) = 4
close(3) = 0
open("/sys/class/leds/red/device/blink", O_RDWR|O_LARGEFILE) = 3
write(3, "1\n", 2) = 2
close(3) = 0
open("/sys/class/leds/red/device/lock", O_RDWR|O_LARGEFILE) = 3
write(3, "0\n", 2) = 2
close(3) = 0
init.rc sets them as system:system 640, explaining why phablet is unable
to reach them.
We either need to open up the default permission or protect that with a
group.
** Affects: android (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1331285
Title:
phablet user is unable to use light sensors (lack of permission in
/sys/class/leds)
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