On Thu, 15 Sept 2022 at 22:55, Rodrigo Vivi <rodrigo.v...@intel.com> wrote: > > On Thu, Sep 15, 2022 at 10:40:59PM +0800, Daniel J Blueman wrote: > > On Thu, 15 Sept 2022 at 22:09, Rodrigo Vivi <rodrigo.v...@intel.com> wrote: > > > On Thu, Sep 15, 2022 at 09:08:08PM +0800, Daniel J Blueman wrote: > > > > Dear Intel et al, > > > > > > > > With a HP Spectre x360 16 16-f1xxx/891D (Intel i7-1260P) with an Arc > > > > A370M GPU [1] running the latest Ubuntu 22.10 5.19.0-15-generic > > > > kernel, we see: > > > > > > > > i915 0000:03:00.0: Your graphics device 5693 is not properly supported > > > > by the driver in this kernel version. To force driver probe anyway, > > > > use i915.force_probe=5693 > > > > > > > > Since the GPU is unmanaged, battery life is around 30% of what it > > > > could be. Unsurprisingly, adding i915.force_probe=5693 causes > > > > additional issues. Given a lack of BIOS option to disable the GPU, is > > > > there any advice for Linux support or at least putting the GPU into > > > > D3? I see only Windows drivers on the official support page [2], and > > > > Linux 6.0-rc5 isn't buildable [3]. > > > > > > I believe this is what you are looking for: > > > > > > echo auto | sudo tee /sys/bus/pci/devices/0000\:03\:00.0/power/control > > > > > > In Linux the default is to keep the unmanaged devices in D0. > > > But changing the rpm to auto should transition the device to D3. > > > > > > You can go further and check with the lspci -vv if there are other > > > unmanaged devices in the same pci root tree and also add them to the > > > 'auto' rpm so you can even achieve D3cold in that whole device, what > > > gives you extra power savings. > > > > > > I hope this helps for now. > > > > Yes, I was also hoping this would work as we see D3hot is supported: > > > > # echo auto > /sys/bus/pci/devices/0000\:03\:00.0/power/control > > # lspci -vvvs 03:00.0 > > ... > > Capabilities: [d0] Power Management version 3 > > Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA > > PME(D0+,D1-,D2-,D3hot+,D3cold-) > > Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME- > > ^^ > > > > However it stays in D0 with PME disabled as we see. "Kernel modules: > > i915" may suggest the i915 driver holds a reference to it, preventing > > the transition. > > Oh, yes. I was thinking more on using the command line I sent when > the i915 is not probed. i.e. without using the force probe. your first > scenario.
My bad - a reference is held when lspci shows "Kernel driver in use: ..." which is not the case here. Accordingly, we see: # ls /sys/bus/pci/drivers/i915 0000:00:02.0 bind module new_id remove_id uevent unbind ...ie no "0000:03:00.0" to unbind. > With the i915 loaded I'd like to see the dmesg and a few of the debugfs > files under: /sys/kernel/debug/dri/0 Sure, see: https://quora.org/a370m/{dmesg.txt,i915-debug.txt} https://quora.org/a370m/{dmesg-forceprobe.txt,i915-debug-forceprobe.txt} Thanks, Dan -- Daniel J Blueman
