【瞎折腾/mi50 32G/ubuntu】mi50显卡ubuntu运行大模型开坑(三)安装风扇并且控制转速

目录

• 说在前面
• 风扇安装
• 确认传感器
• 确认主板IO型号
• 加载内核模块
• 再次验证传感器
• 手动控制风扇
• 其他

说在前面

• 主板：未知x99
• cpu：E5 2666v3
• 显卡：Mi 50 32G
• 系统：ubuntu 22.04
• 风扇：4pin pwm 外壳风扇
• 其他：mi50跑模型的时候，散热不好真不行，很容易到90+度

风扇安装

• 这是拆下来的原装外壳，将上下共六颗螺丝拆下；左侧支架三颗螺丝拆下（不拆的话会卡着，外壳卸不下）
  

• 这是装好的外壳
  

• 将风扇接口连接到主板的cpu fan上
  

确认传感器

• 安装fancontrol

  sudo apt install fancontrol

  这个时候如果直接使用pwmconfig，只能看到3个设备

  lele@lele-X99M-Gaming:~$ sudo pwmconfig
  # pwmconfig version 3.6.0
  This program will search your sensors for pulse width modulation (pwm)
  controls, and test each one to see if it controls a fan on
  your motherboard. Note that many motherboards do not have pwm
  circuitry installed, even if your sensor chip supports pwm.
  
  We will attempt to briefly stop each fan using the pwm controls.
  The program will attempt to restore each fan to full speed
  after testing. However, it is ** very important ** that you
  physically verify that the fans have been to full speed
  after the program has completed.
  
  Found the following devices:
     hwmon0 is nvme
     hwmon1 is coretemp
     hwmon2 is amdgpu
  
  Found the following PWM controls:
     hwmon2/pwm1           current value: 255
  
  Giving the fans some time to reach full speed...
  Found the following fan sensors:
     hwmon2/fan1_input     current speed: 0 ... skipping!
  
  There are no working fan sensors, all readings are 0.
  Make sure you have a 3-wire fan connected.
  You may also need to increase the fan divisors.
  See doc/fan-divisors for more information.

  虽然明确看到hwmon2 is amdgpu，但是mi 50是没有风扇的，所以出现了提示There are no working fan sensors, all readings are 0.我还以为hwmon2就是装的外置风扇，结果怎么调都没反应。

• 接下来我们要手动检测这个外置风扇

确认主板IO型号

• 确认 X99 主板的 Super I/O 芯片型号

  sudo apt install lm-sensors
  sudo sensors-detect

  执行后，在所有输入的地方输入YES

  # sensors-detect version 3.6.0
  # System: YiChenYu X99M-Gaming [Default string]
  # Kernel: 6.8.0-58-generic x86_64
  # Processor: Intel(R) Xeon(R) CPU E5-2666 v3 @ 2.90GHz (6/63/2)
  
  This program will help you determine which kernel modules you need
  to load to use lm_sensors most effectively. It is generally safe
  and recommended to accept the default answers to all questions,
  unless you know what you're doing.
  
  Some south bridges, CPUs or memory controllers contain embedded sensors.
  Do you want to scan for them? This is totally safe. (YES/no): YES

  最终可以看到型号nct6775：

  Now follows a summary of the probes I have just done.
  Just press ENTER to continue:
  
  Driver `lm63':
    * Bus `SMBus I801 adapter at f000'
      Busdriver `i2c_i801', I2C address 0x4c
      Chip `National Semiconductor LM96163' (confidence: 6)
  
  Driver `nct6775':
    * ISA bus, address 0xa20
      Chip `Nuvoton NCT5532D/NCT6779D Super IO Sensors' (confidence: 9)
  
  Driver `coretemp':
    * Chip `Intel digital thermal sensor' (confidence: 9)
  
  To load everything that is needed, add this to /etc/modules:
  #----cut here----
  # Chip drivers
  coretemp
  lm63
  nct6775
  #----cut here----

加载内核模块

• 使用lsmod确认模块是否加载

  lsmod | grep nct6775

  如果没有输出，则加载对应模块：

  sudo modprobe nct6775

  确认加载完成：

  lele@lele-X99M-Gaming:~$ lsmod | grep nct6775
  nct6775                40960  0
  nct6775_core          106496  1 nct6775
  hwmon_vid              12288  1 nct6775

再次验证传感器

• 这个时候查看/sys/class/hwmon目录，发现多了一个设备：

  lele@lele-X99M-Gaming:~$ ls /sys/class/hwmon
  hwmon0  hwmon1  hwmon2  hwmon3

• 查看hwmon3内容，发现有多个pwm

  lele@lele-X99M-Gaming:~$ ls /sys/class/hwmon/hwmon3/ | grep pwm|grep -v _
  pwm1
  pwm2
  pwm3
  pwm4
  pwm5

• 所以我们需要确认哪一个是gpu风扇

  sudo pwmconfig
  # pwmconfig version 3.6.0
  This program will search your sensors for pulse width modulation (pwm)
  controls, and test each one to see if it controls a fan on
  your motherboard. Note that many motherboards do not have pwm
  circuitry installed, even if your sensor chip supports pwm.
  
  We will attempt to briefly stop each fan using the pwm controls.
  The program will attempt to restore each fan to full speed
  after testing. However, it is ** very important ** that you
  physically verify that the fans have been to full speed
  after the program has completed.
  
  Found the following devices:
     hwmon0 is nvme
     hwmon1 is coretemp
     hwmon2 is amdgpu
     hwmon3 is nct6779
  
  Found the following PWM controls:
     hwmon2/pwm1           current value: 255
     hwmon3/pwm1           current value: 255
     hwmon3/pwm2           current value: 56
  hwmon3/pwm2 is currently setup for automatic speed control.
  In general, automatic mode is preferred over manual mode, as
  it is more efficient and it reacts faster. Are you sure that
  you want to setup this output for manual control? (n)
     hwmon3/pwm3           current value: 255
     hwmon3/pwm4           current value: 255
     hwmon3/pwm5           current value: 255
  
  Giving the fans some time to reach full speed...
  Found the following fan sensors:
     hwmon2/fan1_input     current speed: 0 ... skipping!
     hwmon3/fan1_input     current speed: 1646 RPM
     hwmon3/fan2_input     current speed: 1239 RPM
     hwmon3/fan3_input     current speed: 0 ... skipping!
     hwmon3/fan4_input     current speed: 0 ... skipping!
     hwmon3/fan5_input     current speed: 0 ... skipping!
  
  Warning!!! This program will stop your fans, one at a time,
  for approximately 5 seconds each!!!
  This may cause your processor temperature to rise!!!
  If you do not want to do this hit control-C now!!!
  Hit return to continue:
  
  Testing pwm control hwmon2/pwm1 ...
    hwmon3/fan1_input ... speed was 1646 now 1652
      no correlation
    hwmon3/fan2_input ... speed was 1239 now 1239
      no correlation
  
  No correlations were detected.
  There is either no fan connected to the output of hwmon2/pwm1,
  or the connected fan has no rpm-signal connected to one of
  the tested fan sensors. (Note: not all motherboards have
  the pwm outputs connected to the fan connectors,
  check out the hardware database on http://www.almico.com/forumindex.php)
  
  Did you see/hear a fan stopping during the above test (n)? n
  
  Testing pwm control hwmon3/pwm1 ...
    hwmon3/fan1_input ... speed was 1646 now 983
      It appears that fan hwmon3/fan1_input
      is controlled by pwm hwmon3/pwm1
  Would you like to generate a detailed correlation (y)? y
      PWM 255 FAN 1668
      PWM 0 FAN 1017
  
    hwmon3/fan2_input ... speed was 1239 now 1241
      no correlation
  
  Testing pwm control hwmon3/pwm3 ...
    hwmon3/fan1_input ... speed was 1646 now 1702
      no correlation
    hwmon3/fan2_input ... speed was 1239 now 1419
      no correlation
  
  No correlations were detected.
  There is either no fan connected to the output of hwmon3/pwm3,
  or the connected fan has no rpm-signal connected to one of
  the tested fan sensors. (Note: not all motherboards have
  the pwm outputs connected to the fan connectors,
  check out the hardware database on http://www.almico.com/forumindex.php)
  
  Did you see/hear a fan stopping during the above test (n)?
  
  Testing pwm control hwmon3/pwm4 ...
    hwmon3/fan1_input ... speed was 1646 now 1677
      no correlation
    hwmon3/fan2_input ... speed was 1239 now 1421
      no correlation
  
  No correlations were detected.
  There is either no fan connected to the output of hwmon3/pwm4,
  or the connected fan has no rpm-signal connected to one of
  the tested fan sensors. (Note: not all motherboards have
  the pwm outputs connected to the fan connectors,
  check out the hardware database on http://www.almico.com/forumindex.php)
  
  Did you see/hear a fan stopping during the above test (n)? n
  
  Testing pwm control hwmon3/pwm5 ...
    hwmon3/fan1_input ... speed was 1646 now 1677
      no correlation
    hwmon3/fan2_input ... speed was 1239 now 1288
      no correlation
  
  No correlations were detected.
  There is either no fan connected to the output of hwmon3/pwm5,
  or the connected fan has no rpm-signal connected to one of
  the tested fan sensors. (Note: not all motherboards have
  the pwm outputs connected to the fan connectors,
  check out the hardware database on http://www.almico.com/forumindex.php)
  
  Did you see/hear a fan stopping during the above test (n)? n
  
  Testing is complete.
  Please verify that all fans have returned to their normal speed.

  再次执行pwmconfig，这个时候程序会开始调试机器上所有pwm风扇，它会先把风扇转速拉满，然后慢慢降低，这样你就知道对应关系了，这里，我知道了hwmon3/pwm2是gpu风扇

手动控制风扇

• 启用手动控制

  echo 1 | sudo tee /sys/class/hwmon/hwmon3/pwm2_enable

• 转速拉满(0最低，255最高)

  echo 255 | sudo tee /sys/class/hwmon/hwmon3/pwm2

  这样就可以看到风扇呼呼转了，声音贼大

其他

• 自动控制转速这里就没继续研究了，如果需要的话应该要将gpu温度和fancontrol关联起来，可以问问deepseek怎么操作

• 测试在满速状态下，跑模型温度大概在75度左右

  ========================================== ROCm System Management Interface ==========================================
  ==================================================== Concise Info ====================================================
  Device  [Model : Revision]    Temp    Power     Partitions      SCLK     MCLK     Fan     Perf  PwrCap  VRAM%  GPU%
          Name (20 chars)       (Edge)  (Socket)  (Mem, Compute)
  ======================================================================================================================
  0       [0x0834 : 0x01]       75.0°C  164.0W    N/A, N/A        1485Mhz  1000Mhz  100.0%  auto  225.0W   63%   100%
          Radeon Instinct MI50
  ======================================================================================================================
  ================================================ End of ROCm SMI Log =================================================