Comment # 82
on bug 75985
from Lukas Wunner
(In reply to Przemysław Kopa from comment #81) > (In reply to Daniel Drake from comment #80) > > A patch titled "PCI: Enable NVIDIA HDA controllers" (effecively attachment > > #137939 [details] [review]) is headed into linux-next and potentially Linux > > 5.3. Testing appreciated! > > Hello there! This commit prevents vga_switcheroo from turning off dGPU > (Geforce 540m) on my optimus machine as described here: > https://bbs.archlinux.org/viewtopic.php?pid=1865512#p1865512. I never had > problems with HDMI audio on this system - I think all connectors are > connected to the Intel GPU, yet NVIDIA HDA is still enabled by this patch. If the HDA is kept runtime resumed, e.g. if it is accessed by a user space application, then the GPU is kept runtime resumed as well. Check the runtime PM status of the HDA: grep . /sys/bus/pci/devices/0000:01:00.1/power/* Check if user space applications have opened the HDA: lsof /dev/snd/controlC1
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