cancel
Showing results for 
Search instead for 
Did you mean: 
Highlighted
ECIT Tutor
Tutor
7 6 0 3
Message 1 of 3
1,203
Flag Post
HP Recommended

BIOS request for 15-db0996na - AMD Ryzen CPU power state bug fix

15-db0996na

There is a bug in the power management of C6 power states on AMD Ryzen and Threadripper chips. More information can be found in this thread for those of a technical mindset:

 

https://bugzilla.kernel.org/show_bug.cgi?id=196683

 

This bug has been more noticable when using the Linux operating system - but exists under all operating systems. It occurs accross the range of AMD Ryzen and Threadripper products.

 

A fix for this bug has been developed by AMD and passed on to third parties such as HP. The fix seems to be in part an update to the microcode for AMD processors, and an update to the way that motherboards handle the power saving states for the processor. In fact it has already been implemented in a bios update for a HP laptop:

 

17-ca0202ng (Ryzen 5 2500u)

 

Discussion:

https://bugzilla.kernel.org/show_bug.cgi?id=196683#c385

 

BIOS update:

https://support.hp.com/gb-en/drivers/selfservice/swdetails/hp-17-ca0000-laptop-pc/20395907/model/224...

 

 1) Is this fix present in the current version of the BIOS supplied with the 15-db0996na laptop?

 

2) If not, when will a BIOS with this fix be released for the 15-db0996na model?

 

3) What is the overall timescale for releasing BIOS updates with this fix for all HP Ryzen and Threadripper based systems?

Tags (1)
2 REPLIES 2
ECIT Tutor
Tutor
7 6 0 3
Message 2 of 3
1,030
Flag Post
HP Recommended

BIOS request for 15-db0996na - AMD Ryzen CPU power state bug fix

A new BIOS revision (F.11 Rev.A) was released for this laptop on 23rd August 2018:

 

https://support.hp.com/gb-en/drivers/selfservice/swdetails/hp-15-db0000-laptop-pc/20395843/model/227...

 

Can someone from HP confirm if this BIOS revision includes the new fixes for the C6 power state management and current delivery subsystems? They are not mentioned in the "Fixes" detailed in the changelog.

 

Can anyone provide feedback on using this laptop with Linux? If you encountered this problem using the release revision of the BIOS can you confirm if this release has helped?

Reply
0 Kudos
ECIT Tutor
Tutor
7 6 0 3
Message 3 of 3
904
Flag Post
HP Recommended

BIOS request for 15-db0996na - AMD Ryzen CPU power state bug fix

For those following this, I have done some testing with this BIOS update.

 

With the original BIOS the laptop seemed to grind to a halt running Ubunut 18.04LTS when left idling for a 24hour period - all I could do was move the mouse.

 

After updating the BIOS, I noted that the microcode version had changed. I tested again leaving the laptop idle for 24h+ and the laptop remained usable.

 

I can't confirm that this machine is cured, but it looks promising so far.

 

Be aware that under Ubuntu 18.04 the wireless card does not function out of the box, but instructions here worked no problems:

https://askubuntu.com/a/1071336

also worth reading about modifying the "CONFIG_RTW_LOG_LEVEL" setting in the post at:

https://askubuntu.com/a/1067788

 

Good luck people,

ECIT

Reply
0 Kudos
† The opinions expressed above are the personal opinions of the authors, not of HP. By using this site, you accept the Terms of Use and Rules of Participation