You're right, my nvidia card is not turned off. /rpco/acpi/bbswitch listed it as on. Battery usage was better than before, though. Maybe because when not actually using the GPU, it at least scales down to a lower frequency, conserving power (because an additional issue, most likely related to the nvidia drivers, is that the nvidia card always runs at max speed and never turns down. Maybe this is because I'm using a UHD display, not sure. No way to check when running in IGP-mode).
Running the command rmmod nvidia_drm nvidia_modeset nvidia_uvm nvidia gives me a notice that nvidia_uvm is not loaded but does unload the other modules. After that I am able to turn off the nvidia card using the command you provided. Battery usage then drops from around 32 Watts to around 19 Watts in idle, so that's a significant improvement. I can't reproduce your crashes when running lshw or lspci, though, they all run fine, even after turning off the nvidia card. Also running something like phoronix-test-suite is fine, the system remains stable. Maybe that's a difference in kernel and/or nvidia driver versions? I've tested using both linux kernel 4.6.0-040600-generic (4.6.0-040600.201605151930) and 4.4.0-23-generic (4.4.0-23.41), using nvidia-364 (364.19-0ubuntu0~gpu16.04.3). Would be very useful / good for battery performance if the nvidia card would be turned off by default. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xserver-xorg-video-intel in Ubuntu. https://bugs.launchpad.net/bugs/1569383 Title: Intel HD Graphics 530 crashes on glxinfo in MSHYBRID mode Status in xserver-xorg-video-intel package in Ubuntu: Incomplete Bug description: On my laptop (Clevo P650RA) with Skylake / Intel Core i7 6700HQ with Intel HD Graphics 530 IGP and a nvidia GTX965M DGP, glxinfo crashes when running in IGP mode, The laptop uses Optimus / MSHYBRID technology to be able to utilize both IGP and DGP. After setup I install nvidia-361 driver, which will make the system run using DGP mode by default. Using prime-select intel I can switch to using the IGP. After logging out and in again, the IGP is being used. However, when doing certain tasks, the system will crash. Running glxinfo is one of them. Another one is: cat /proc/acpi/bbswitch In addition, it sometimes seemingly at random, probably when some kind of desktop effect is performed. It seems that some kind of interaction with ACPI / IGP will make it crash. This is running Kubuntu 16.04 Xenial Beta 2. Some version numbers: Kernel version (uname -r): 4.4.0-18-generic linux-image-4.4.0-18-generic: 4.4.0-18.34 xserver-xorg-core: 2:1.18.3-1ubuntu2 xserver-xorg-video-intel: 2:2.99.917+git20160325-1ubuntu1 sddm: 0.13.0-1ubuntu5 plasma-desktop: 4:5.5.4-0ubuntu1 lsb_release -a: Distributor ID: Ubuntu Description: Ubuntu Xenial Xerus (development branch) Release: 16.04 Codename: xenial I'll attach a kern.log and a Xorg.0.log from a Intel IGP session on this laptop. Please let me know if I should provide other information, and how to collect this after a full system freeze. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1569383/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
