On Tue, Aug 30, 2016 at 02:13:46PM -0400, Ilia Mirkin wrote: > On Tue, Aug 30, 2016 at 2:02 PM, Roland Singer > <roland.singer@xxxxxxxxxxxxx> wrote: > > I configured bbswitch to not set any states automatically... > > So it's possible to obtain and verify the GPU power state. > > > > However I removed the bbswitch module and booted with nouveau. > > > > Kernel 4.7.2: nouveau switches the discrete GPU off. > > I can't trigger the freeze, because bbswitch is missing. > > I'll work with the system and see if it will freeze. > > > > Kernel 4.8-rc4: nouveau does not care about the power state and > > the discrete GPU is never switched off. I will notice > > this, because the second cooling FAN will stop... > > Same log messages as send before. > > That's surprising. I believe there's an issue with the new logic when > there's an HDMI audio subdevice. However that only appears if there's > a cable plugged in, at least in the systems Peter tested. You should > be able to see whether it's there or not with 'lspci'. I doubt that the audio device is responsible here, that should only show up after following very specific steps (runtime suspend/resume (PCI or ACPI magic), remove PCI device, rescan bus). > You can check for sure by looking in the vgaswitcheroo state. It > should say DynOff when it's powered off. > > Either way, I think using bbswitch + nouveau isn't supported by > anyone, so if you want to use it that way, you're on your own. (You > may want to load nouveau with runpm=0 so that nouveau doesn't try to > manage the GPU suspend stuff.) I understood that Roland's intent is to check the power state, not use the suspend functionality of bbswitch, if you load bbswitch without module options amd do not write to /proc/bbswitch, then it allows you to read out the actual status (you could also just use lspci -H1 for that though). -- Kind regards, Peter Wu https://lekensteyn.nl _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
