Created attachment 141734 [details] kernel log Overall, nouveau works without problem in managing discrete GPU PM, and if I check power consumption using powertop on a fresh boot it reports an average battery discharge rate of ~7W like always. After I resume the laptop from suspend, /sys/kernel/debug/vgaswitcheroo/switch reports that the device is dynamically turned off: 0:IGD:+:Pwr:0000:00:02.0 1:DIS: :DynOff:0000:01:00.0 But if I check with powertop, I get a battery discharge rate of ~11W. To better identify the problem, I tried using bumbleebee+bbswitch+nvidia-driver and see what bbswitch module reports. On a fresh boot, it works ok as the nouveau driver, but after resuming from suspend /proc/acpi/bbswitch reports that the card is turned ON, and there is no way to power it off: [root@example user]# cat /proc/acpi/bbswitch 0000:04:00.0 ON [root@example user]# tee /proc/acpi/bbswitch <<<OFF OFF [root@example user]# cat /proc/acpi/bbswitch 0000:04:00.0 ON I attached the kernel log using following parameters when using only nouveau driver (no bumblebee/bbswitch/nvidia): log_buf_len=1M nouveau.debug=debug. System specs: Asus Vivobook S551LN Intel i7 4500U NVIDIA 840M Archlinux 4.18.9-arch1-1-ARCH (but affecting older versions, since early 4.x version when i started using linux)
I might have the same issue - I posted it under bug 98386. Happens on a Dell M3800, Intel Core i7-4702HQ, Nvidia Quadro K1100M, Arch Linux w/ kernel 4.19.2. Same as you, after fresh boot I get around ~7W in idle and after S3 resume I get 15W and more, no matter how long I wait. Contrary to your observations, bbswitch works for me; nouveau doesn't. I have found out, that echoing lowest pstate (/sys/kernel/debug/dri/*/pstate) after S3 resume solves this issue. Power consumption drops back to 7-8W in idle. I will post full dmidecode and dmesg in a couple of hours.
Created attachment 142575 [details] dmesg, comments at line 947 and 1051
Created attachment 142576 [details] dmidecode Dell M3800
Created attachment 142577 [details] lspci Dell M3800
Created attachment 142578 [details] lspci verbose Dell M3800
No longer occurs under stable kernel 4.20.6. Can you confirm this @Domenico?
Still occurring to me on linux 5.0.2. I also noticed that after resuming from suspend, if I run something with the discrete GPU like this: DRI_PRIME=1 glxgears -info the power consumption returns to normal values. This seems to be the same behavior already noticed by @Tolga in comment #1
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