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Linux breaks BIOS fan control?

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1

I have a strange (and annoying) problem with my ASUS UX32LA notebook: I suspect that Linux (confirmed at 4.18.0-17-generic kernel) somehow breaks BIOS control over fans.

Why?

• One day (don't remember when, not using this notebook very often) fans started to work at full speed when using Linux (it was 4.x line kernel).


• First I though of trying reboot to Windows to see if problem persists. It turned out that indeed fans were still at full speed on Windows.


• Then I though that it may be a hardware issue. I gave computer to the repair and I was amused when they told me that re-flashing BIOS made fans work properly on Windows (they refused to check on Linux...). No hardware issue.


• Having computer back I operated Windows for some time (week or so) to see if the issue is gone. It was.


• After booting into Linux the issue was back as soon as CPU temperature rose enough for the fan to turn on. It turned on to full speed and remained so. After that it's not important if it's Linux or Windows. Fans at full speed.


• Re-flashing BIOS solves the issue as long as Linux is not booted. On Windows fans work normally.

I don't expect easy answer here, but maybe someone could give me a hint where to start debugging? I found some posts that it may be related to the Differentiated System Description Table...

bios asus fan

share|improve this question

edited 1 hour ago

K7AAY

1,1301028

asked 8 hours ago

kaolprkaolpr

287

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Unfortunately, no additional information on the back of the computer. Output of dmidecode: ASUSTeK COMPUTER INC., product Name: UX32LA, version: 1.0, SKU Number: ASUS-Ultrabook, Family: UX
  
  – kaolpr
  7 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Better! Updated URL for web link. Now, which distro and release number are you using? Please click edit and add that extremely useful info, because you could be using any of 285 distros, each with many releases. Please do NOT reply by Add Comment because those pile up and get hidden; please instead add that to the Question so all many see it.
  
  – K7AAY
  5 hours ago
  

  
  
  
  

add a comment | 

1

I have a strange (and annoying) problem with my ASUS UX32LA notebook: I suspect that Linux (confirmed at 4.18.0-17-generic kernel) somehow breaks BIOS control over fans.

Why?

• One day (don't remember when, not using this notebook very often) fans started to work at full speed when using Linux (it was 4.x line kernel).


• First I though of trying reboot to Windows to see if problem persists. It turned out that indeed fans were still at full speed on Windows.


• Then I though that it may be a hardware issue. I gave computer to the repair and I was amused when they told me that re-flashing BIOS made fans work properly on Windows (they refused to check on Linux...). No hardware issue.


• Having computer back I operated Windows for some time (week or so) to see if the issue is gone. It was.


• After booting into Linux the issue was back as soon as CPU temperature rose enough for the fan to turn on. It turned on to full speed and remained so. After that it's not important if it's Linux or Windows. Fans at full speed.


• Re-flashing BIOS solves the issue as long as Linux is not booted. On Windows fans work normally.

I don't expect easy answer here, but maybe someone could give me a hint where to start debugging? I found some posts that it may be related to the Differentiated System Description Table...

bios asus fan

share|improve this question

edited 1 hour ago

K7AAY

1,1301028

asked 8 hours ago

kaolprkaolpr

287

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Unfortunately, no additional information on the back of the computer. Output of dmidecode: ASUSTeK COMPUTER INC., product Name: UX32LA, version: 1.0, SKU Number: ASUS-Ultrabook, Family: UX
  
  – kaolpr
  7 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Better! Updated URL for web link. Now, which distro and release number are you using? Please click edit and add that extremely useful info, because you could be using any of 285 distros, each with many releases. Please do NOT reply by Add Comment because those pile up and get hidden; please instead add that to the Question so all many see it.
  
  – K7AAY
  5 hours ago
  

  
  
  
  

add a comment | 

I have a strange (and annoying) problem with my ASUS UX32LA notebook: I suspect that Linux (confirmed at 4.18.0-17-generic kernel) somehow breaks BIOS control over fans.

Why?

• One day (don't remember when, not using this notebook very often) fans started to work at full speed when using Linux (it was 4.x line kernel).


• First I though of trying reboot to Windows to see if problem persists. It turned out that indeed fans were still at full speed on Windows.


• Then I though that it may be a hardware issue. I gave computer to the repair and I was amused when they told me that re-flashing BIOS made fans work properly on Windows (they refused to check on Linux...). No hardware issue.


• Having computer back I operated Windows for some time (week or so) to see if the issue is gone. It was.


• After booting into Linux the issue was back as soon as CPU temperature rose enough for the fan to turn on. It turned on to full speed and remained so. After that it's not important if it's Linux or Windows. Fans at full speed.


• Re-flashing BIOS solves the issue as long as Linux is not booted. On Windows fans work normally.

I don't expect easy answer here, but maybe someone could give me a hint where to start debugging? I found some posts that it may be related to the Differentiated System Description Table...

bios asus fan

share|improve this question

edited 1 hour ago

K7AAY

1,1301028

asked 8 hours ago

kaolprkaolpr

287

share|improve this question

edited 1 hour ago

K7AAY

1,1301028

asked 8 hours ago

kaolprkaolpr

287

share|improve this question

edited 1 hour ago

K7AAY

1,1301028

asked 8 hours ago

kaolprkaolpr

287

edited 1 hour ago

K7AAY

1,1301028

edited 1 hour ago

K7AAY

1,1301028

asked 8 hours ago

kaolprkaolpr

287

asked 8 hours ago

kaolprkaolpr

287