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--- doc:appunti:hardware:qnap_ts-120 [2025/03/21 16:50] – [Problem with i2c bus] niccolo
+++ doc:appunti:hardware:qnap_ts-120 [2025/04/01 12:55] (current) – [Cooling Fan] niccolo
@@ Line 158: / Line 158: @@
 </code>
-===== Problem with i2c bus =====
+===== Problem with the I2C bus locked =====
 Booting the **4.9.0-17** kernel, the ''dmesg'' output reveals the following error message:
@@ Line 169: / Line 169: @@
 </code>
-This means that the I2C bus is locked and the RTC kernel module cannot load:
+Booting the **4.19.0-21** kernel, the error message is slightly different:
+<code>
+i2c /dev entries driver
+i2c i2c-0: mv64xxx: I2C bus locked, block: 1, time_left: 0
+rtc-s35390a 0-0030: error resetting chip
+rtc-s35390a: probe of 0-0030 failed with error -5
+</code>
+This means that the I2C bus is locked and the RTC kernel module cannot load properly:
 <code>
@@ Line 183: / Line 192: @@
 </code>
+The **problem was solved** by powering off the QNAP, **unplugging the power** connector and removing the inside clock battery (this last operation may be not necessary).
+If the module is loaded and working, you can read the pseudofile **/proc/driver/rtc**:
+<code>
+cat /proc/driver/rtc
+rtc_time        : 12:55:51
+rtc_date        : 2025-03-31
+alrm_time       : 12:50:51
+alrm_date       : 2025-04-01
+alarm_IRQ       : no
+alrm_pending    : no
+update IRQ enabled      : no
+periodic IRQ enabled    : no
+periodic IRQ frequency  : 1
+max user IRQ frequency  : 64
+hr            : yes
+</code>
+**NOTICE**: There is a problem with poweroff which results into a reboot, which is eventually related to the RTC, which is working on the I2C bus. See the following thread for some insight: **[[https://groups.google.com/g/linux.debian.ports.arm/c/Vb-uE7Emj_k|Debian Jessie on QNAP TS-112P - Reboot instead of shutdown]]**. Check also the **qcontrol** tool, which does have an **rtc on** option.
-  * **[[https://groups.google.com/g/linux.debian.ports.arm/c/Vb-uE7Emj_k|Debian Jessie on QNAP TS-112P - Reboot instead of shutdown]]**
 ===== Upgrading to 4 Tb Hard Disk =====
@@ Line 372: / Line 400: @@
 Flashing kernel (using 2067802/2097152 bytes)... done.
 Flashing initramfs (using 6101378/9437184 bytes)... done.
+</code>
+===== Cooling Fan =====
+The original fan is **50x50x15 mm** and is marked as:
+  * **Y.S. TECH**
+  * **FD125015LB**
+  * **DC12V 0.085A**
+The pinout of the QNAP TS-120 fan is:
+^ PIN  ^ Color  ^ Function  ^
+|  1 | Black   | Ground  |
+|  2 | Yellow  | +12 v DC  |
+|  3 | Green   | Tachometer (sense) signal  |
+|  4 | Blue    | PWM control signal  |
+This is the **standard pinout of a CPU fan** with PWM speed control an tachometer sensor:
+^ PIN  ^ Color   ^ Function          ^
+|    1 | Black   | Ground            |
+|    2 | Red     | +12 v DC          |
+|    3 | Yellow  | Tachometer Sense  |
+|    4 | Blue    | PWM Control       |
+To control the fan speed you can use the **qcontrol** tool:
+<code>
+qcontrol fanspeed {stop|silence|low|medium|high|full}
+</code>
+===== Automatic power-on =====
+To enable automatic power-on when power is restored (if the device was not powered down correctly):
+<code>
+qcontrol --direct autopower on
+</code>
+===== Temperature sensor =====
+<code>
+cat /sys/class/hwmon/hwmon0/temp1_input
 </code>