mrcl
1 Copper

Re: XPS 13 9370 no bluetooth after suspend

What has worked for me is to disable wireless switch for bluetooth in the BIOS Settings.

Now it is working just fine.

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jkrx
1 Nickel

Re: XPS 13 9370 no bluetooth after suspend

@mrcl: Tried this. Worked once, didn't work the next day. So I'm guessing you had luck a couple of times that's it.

 

Anyone from Dell working on this?

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ShedG
1 Nickel

Re: XPS 13 9370 no bluetooth after suspend

I'm running Debian Testing on a 9370 originally purchased from Costco with Win10. I do recall seeing the BT disappear at one point, likely before or during the upgrade from Stretch to Testing. At present I am not experiencing any difficulties with BT after suspend. I use a BT mouse so I think I would notice.

Versions of what I have are:

hbarta@rocinante:~$ uname -a
Linux rocinante 4.17.0-1-amd64 #1 SMP Debian 4.17.8-1 (2018-07-20) x86_64 GNU/Linux
hbarta@rocinante:~$ dpkg -l bluez
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name                       Version            Architecture       Description
+++-==========================-==================-==================-==========================================================
ii  bluez                      5.50-1             amd64              Bluetooth tools and daemons
hbarta@rocinante:~$ 

I occasionally boot Windows so that the Dell stuff can update firmware and I don't get too far behind on Windows updates. (I also have `fwupd` installed.)

I have disabled something related to suspend in the BIOS. (I can check it out if important) I did that so the laptop would remain suspended. Otherwise suspend was transient (it came right out.)

If there is anything I can check or test that would help others with this issue, please let me know.

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Re: XPS 13 9370 no bluetooth after suspend

Hi,

I would gladly try your BIOS suspend option you changed.

 

Thanks in advance,

~françois

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ShedG
1 Nickel

Re: XPS 13 9370 no bluetooth after suspend

> I would gladly try your BIOS suspend option you changed.

Performance -> C-States Control -> C State (disabled.)

 

I'm also using he temporary fix suggested in https://askubuntu.com/questions/1029474/ubuntu-18-04-dell-xps13-9370-no-longer-suspends-on-lid-close...

 

echo deep > /sys/power/mem_sleep

This seems to reduce power usage during suspend.

 

hope this helps,

hank

 

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marcaux
2 Bronze

Re: XPS 13 9370 no bluetooth after suspend

Well disabling C-states from the CPU is not a fix. This just disables the CPU powersaving features and has nothing to do with the disappearing bluetooth device. This just drains your battery.

The laptop normally uses S2 and not S3 for suspending. For entering deep sleep you can use your command or use this kernel parameter: mem_sleep_default=deep

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jamtur01
1 Nickel

Re: XPS 13 9370 no bluetooth after suspend

The issue is a firmware bug. When last I spoke to Dell, there is a fix in QA for the problem that will hopefully be released soon. 

None of the workarounds in this thread address that unfortunately.

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thoughton
1 Nickel

Re: XPS 13 9370 no bluetooth after suspend


@jamtur01 wrote:

The issue is a firmware bug. When last I spoke to Dell, there is a fix in QA for the problem that will hopefully be released soon.

Oh! This is literally the first mention of Dell allegedly even ackgnowledging the issue, let alone that they have a fix coming for it. This is fantastic news!

The only thing that could be even better would be if someone from Dell could confirm this, and maybe even give an indication of potential time-scale for release?

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ejosafat
1 Copper

Re: XPS 13 9370 no bluetooth after suspend

I hope they deliver!

I never had problems before but since their last firmware update I started experiencing the same problem with bluetooth disabled after suspend and sometimes even the wifi adapter as well. As I'm still using the operating system (Ubuntu 16.04) preinstalled in the hardware I got from them, I expect them to fix the problem they caused.

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marcaux
2 Bronze

Re: XPS 13 9370 no bluetooth after suspend


@ejosafat wrote:

I hope they deliver!


I wait since January - some may say hope dies last but well...

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