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2018 Mar 05
0
[PATCH v2 0/7] Modernize vga_switcheroo by using device link for HDA
...and nouveau/snd-hda-intel unloaded.
To check the runtime PM status, I used this "rpm-status" script:
grep --color . /sys/bus/pci/devices/0000:00:01.0/{0000:01:00.0/,0000:01:00.1/,}power/control
grep --color . /sys/bus/pci/devices/0000:00:01.0/{0000:01:00.0/,0000:01:00.1/,}power/runtime_{enabled,usage,active_kids,status}
To test audio output (via HDMI; DP port does not seem to support audio):
speaker-test -Dhdmi:CARD=NVidia,DEV=0 -c2
Below I first list some issues, then some good news.
Issue 1 - GPU does not suspend on text console.
When present at the text console and an...
2018 Mar 03
12
[PATCH v2 0/7] Modernize vga_switcheroo by using device link for HDA
...1k/linux/commits/switcheroo_devlink_v2
Minimal test procedure:
- Note well: Recent Optimus require that a Mini-DP or HDMI cable is
plugged in on boot for the HDA device to be present.
- Check that HDA, GPU and root port autosuspend when not in use:
cat /sys/bus/pci/devices/0000:01:00.1/power/runtime_status # HDA
cat /sys/bus/pci/devices/0000:01:00.0/power/runtime_status # GPU
cat /sys/bus/pci/devices/0000:00:01.0/power/runtime_status # Root Port
- Check that all three autoresume when accessing the HDA:
hdajacksensetest -c 1
- Unbind the HDA controller:
echo 0000:01:00.1 > /sys/b...