With 4.14 :
cat /sys/class/thermal/thermal_zone4/type
B0D4

ls -al /sys/class/thermal/thermal_zone4/device
ls: cannot access '/sys/class/thermal/thermal_zone4/device': No such file or 
directory

with 4.15:
find /sys/class/thermal/thermal_zone4/ -type f -print -exec cat {} \;
find /sys/class/thermal/thermal_zone4/ -type f -print -exec cat {} \;
/sys/class/thermal/thermal_zone4/trip_point_3_type
passive
/sys/class/thermal/thermal_zone4/trip_point_2_type
hot
/sys/class/thermal/thermal_zone4/trip_point_4_temp
63000
/sys/class/thermal/thermal_zone4/available_policies
power_allocator user_space bang_bang fair_share step_wise 
/sys/class/thermal/thermal_zone4/policy
user_space
/sys/class/thermal/thermal_zone4/trip_point_1_type
passive
/sys/class/thermal/thermal_zone4/trip_point_3_temp
83000
/sys/class/thermal/thermal_zone4/trip_point_4_hyst
2000
/sys/class/thermal/thermal_zone4/emul_temp
cat: /sys/class/thermal/thermal_zone4/emul_temp: Permission denied
/sys/class/thermal/thermal_zone4/offset
0
/sys/class/thermal/thermal_zone4/integral_cutoff
0
/sys/class/thermal/thermal_zone4/power/runtime_active_kids
0
/sys/class/thermal/thermal_zone4/power/runtime_suspended_time
0
/sys/class/thermal/thermal_zone4/power/autosuspend_delay_ms
cat: /sys/class/thermal/thermal_zone4/power/autosuspend_delay_ms: Input/output 
error
/sys/class/thermal/thermal_zone4/power/runtime_enabled
disabled
/sys/class/thermal/thermal_zone4/power/runtime_active_time
0
/sys/class/thermal/thermal_zone4/power/control
auto
/sys/class/thermal/thermal_zone4/power/async
disabled
/sys/class/thermal/thermal_zone4/power/runtime_usage
0
/sys/class/thermal/thermal_zone4/power/runtime_status
unsupported
/sys/class/thermal/thermal_zone4/k_d
0
/sys/class/thermal/thermal_zone4/trip_point_0_type
passive
/sys/class/thermal/thermal_zone4/trip_point_2_temp
100000
/sys/class/thermal/thermal_zone4/trip_point_3_hyst
2000
/sys/class/thermal/thermal_zone4/type
SEN1
/sys/class/thermal/thermal_zone4/trip_point_1_temp
0
/sys/class/thermal/thermal_zone4/trip_point_2_hyst
2000
/sys/class/thermal/thermal_zone4/slope
0
/sys/class/thermal/thermal_zone4/k_po
0
/sys/class/thermal/thermal_zone4/k_i
0
/sys/class/thermal/thermal_zone4/sustainable_power
0
/sys/class/thermal/thermal_zone4/trip_point_0_temp
0
/sys/class/thermal/thermal_zone4/trip_point_1_hyst
2000
/sys/class/thermal/thermal_zone4/k_pu
0
/sys/class/thermal/thermal_zone4/temp
cat: /sys/class/thermal/thermal_zone4/temp: Input/output error
/sys/class/thermal/thermal_zone4/trip_point_4_type
active
/sys/class/thermal/thermal_zone4/uevent
/sys/class/thermal/thermal_zone4/trip_point_0_hyst
2000

ls -al /sys/class/thermal/thermal_zone4/
total 0
drwxr-xr-x  3 root root    0 Apr 16 13:35 .
drwxr-xr-x 15 root root    0 Apr 16 13:34 ..
-r--r--r--  1 root root 4096 Apr 16 13:35 available_policies
--w-------  1 root root 4096 Apr 16 13:35 emul_temp
-rw-r--r--  1 root root 4096 Apr 16 13:35 integral_cutoff
-rw-r--r--  1 root root 4096 Apr 16 13:35 k_d
-rw-r--r--  1 root root 4096 Apr 16 13:35 k_i
-rw-r--r--  1 root root 4096 Apr 16 13:35 k_po
-rw-r--r--  1 root root 4096 Apr 16 13:35 k_pu
-rw-r--r--  1 root root 4096 Apr 16 13:35 offset
-rw-r--r--  1 root root 4096 Apr 16 13:35 policy
drwxr-xr-x  2 root root    0 Apr 16 13:35 power
-rw-r--r--  1 root root 4096 Apr 16 13:35 slope
lrwxrwxrwx  1 root root    0 Apr 16 13:34 subsystem -> ../../../../class/thermal
-rw-r--r--  1 root root 4096 Apr 16 13:35 sustainable_power
-r--r--r--  1 root root 4096 Apr 16 13:34 temp
-r--r--r--  1 root root 4096 Apr 16 13:34 trip_point_0_hyst
-rw-r--r--  1 root root 4096 Apr 16 13:34 trip_point_0_temp
-r--r--r--  1 root root 4096 Apr 16 13:34 trip_point_0_type
-r--r--r--  1 root root 4096 Apr 16 13:34 trip_point_1_hyst
-rw-r--r--  1 root root 4096 Apr 16 13:34 trip_point_1_temp
-r--r--r--  1 root root 4096 Apr 16 13:34 trip_point_1_type
-r--r--r--  1 root root 4096 Apr 16 13:34 trip_point_2_hyst
-r--r--r--  1 root root 4096 Apr 16 13:34 trip_point_2_temp
-r--r--r--  1 root root 4096 Apr 16 13:34 trip_point_2_type
-r--r--r--  1 root root 4096 Apr 16 13:34 trip_point_3_hyst
-r--r--r--  1 root root 4096 Apr 16 13:34 trip_point_3_temp
-r--r--r--  1 root root 4096 Apr 16 13:34 trip_point_3_type
-r--r--r--  1 root root 4096 Apr 16 13:34 trip_point_4_hyst
-r--r--r--  1 root root 4096 Apr 16 13:34 trip_point_4_temp
-r--r--r--  1 root root 4096 Apr 16 13:34 trip_point_4_type
-r--r--r--  1 root root 4096 Apr 16 13:34 type
-rw-r--r--  1 root root 4096 Apr 16 13:34 uevent



** Attachment added: "journalctl -n 10000 > journalctl.log (kernel 4.15)"
   
https://bugs.launchpad.net/ubuntu/+source/thermald/+bug/1764320/+attachment/5117941/+files/journalctl.log

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https://bugs.launchpad.net/bugs/1764320

Title:
  Thermald  sysfs read failed /sys/class/thermal/thermal_zoneX/temp

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