It appears this a result of hyperthreading being enabled, see conversation
in https://github.com/QubesOS/qubes-issues/issues/5210
On Friday, July 26, 2019 at 10:15:31 PM UTC-7, andrew...@gmail.com wrote:
>
> Ok, this wasn't expected but I actually see similar behavior on my T470 -
> power consumption is roughly 2X on the T470 after suspend/resume, and 3-4x
> on the T490. Can someone else try measuring power consumption before and
> after the first suspend/resume cycle and report back? I have a feeling this
> could be impacting more people.
>
> On Friday, July 26, 2019 at 5:36:58 PM UTC-7, Andrew Sorensen wrote:
>>
>> I didn't see any reports of Qubes on the T490, so I figured I'd start
>> one: I just got a T490 (i7 model with 32GB of ram), and was able to get
>> Qubes 4.0.2rc1 installed and usable (after excluding the network card from
>> FLR). For the most part, it appears it will be as usable as Qubes on my
>> T470 with one problem: power consumption. On a cold boot, everything seems
>> acceptable and I get a good number of hours of battery life, however after
>> suspending the laptop and resuming, power consumption spikes from 4W to
>> 15W+, reducing battery life down to a few hours and keeping the fan pegged.
>>
>> I've tried upgrading to kernel-latest (e.g. 5.x) and using
>> tlp/powertop/xenpm to troubleshoot further, but nothing stuck out. I also
>> downloaded Fedora 30 and was able to suspend and resume without seeing the
>> additional power increase. My understanding is that power management is
>> handled by Xen, and not Dom0 so I think I'm pretty much out of options, but
>> figured I'd drop a note in case anyone else runs into this. I don't plan to
>> investigate much further since I also have the T470, but look forward to
>> trying again when Qubes 4.1 is available in some form.
>>
>> Also - if someone else wants to test/play around - make sure to use the
>> latest qubes release. I first tried with the version I used to setup my
>> T470 since I didn't have a lot of time, but there were graphical issues
>> (*very* slow painting of the installer/desktop UI), and wireless and wired
>> networking were unavailable.
>>
>
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