[Bug 205291] Cannot switch off Radeon HD 4330/4350/4550 with vgaswitcheroo

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=205291

K J Petrie (kernel.bugs at kjpetrie.co.uk) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |CODE_FIX

--- Comment #11 from K J Petrie (kernel.bugs at kjpetrie.co.uk) ---
I decided to compile 5.6.6 with CONFIG_PM_ADVANCED_DEBUG.

To my amazement, this gave me:
# uname -r
5.6.6

# cat /sys/kernel/debug/vgaswitcheroo/switch 
0:IGD:+:Pwr:0000:00:02.0
1:DIS: :DynOff:0000:01:00.0
2:DIS-Audio: :DynOff:0000:01:00.1    (!!!!!!)

(GPU)
# cat /sys/bus/pci/devices/0000\:01\:00.0/power/control 
auto
# cat /sys/bus/pci/devices/0000\:01\:00.0/power/runtime_status 
suspended
cat /sys/bus/pci/devices/0000\:01\:00.0/power/runtime_usage 
0
# cat /sys/bus/pci/devices/0000\:01\:00.0/power/runtime_active_kids
0

(HDA)
# cat /sys/bus/pci/devices/0000\:01\:00.1/power/control 
auto
# cat /sys/bus/pci/devices/0000\:01\:00.1/power/runtime_status 
suspended
# cat /sys/bus/pci/devices/0000\:01\:00.1/power/runtime_usage 
0
# cat /sys/bus/pci/devices/0000\:01\:00.1/power/runtime_active_kids 
0

So, either enabling CONFIG_PM_ADVANCED_DEBUG affects this or it's fixed in the
latest kernels.

As a quick check I installed the distribution's latest kernel:

# uname -r
5.5.19-pclos1
[root at master2 ken]# cat /sys/kernel/debug/vgaswitcheroo/switch 
0:IGD:+:Pwr:0000:00:02.0
1:DIS: :DynOff:0000:01:00.0
2:DIS-Audio: :DynOff:0000:01:00.1

So it looks as if it was fixed in the 5.5 kernels.

However, both the 5.5 (distro) and 5.6 (mainline) kernels emit a terrible
clattering sound during services start up. I'm unsure whether that's coming
from the speakers, HDD or optical drive. If the former, it's just a nuisance,
if one of the latter it's not good news. I hope that's not related to the fix!

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