Am 30.08.2016 um 20:13 schrieb Ilia Mirkin:
On Tue, Aug 30, 2016 at 2:02 PM, Roland Singer roland.singer@desertbit.com 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'.
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.)
-ilia
Kernel 4.8-rc4:
While running lspci, following kernel log message was printed on the TTY:
nouveau: 0000:01:00:0: priv: HUB0: 6013d4 0000573f (1f408200) nouveau: 0000:01:00:0: priv: HUB0: 10ecc0 ffffffff (1940822c)
This is my output of lspci:
00:00.0 Host bridge: Intel Corporation Skylake Host Bridge/DRAM Registers (rev 07) 00:01.0 PCI bridge: Intel Corporation Skylake PCIe Controller (x16) (rev 07) 00:02.0 VGA compatible controller: Intel Corporation HD Graphics 530 (rev 06) 00:08.0 System peripheral: Intel Corporation Skylake Gaussian Mixture Model 00:14.0 USB controller: Intel Corporation Sunrise Point-H USB 3.0 xHCI Controller (rev 31) 00:14.2 Signal processing controller: Intel Corporation Sunrise Point-H Thermal subsystem (rev 31) 00:15.0 Signal processing controller: Intel Corporation Sunrise Point-H Serial IO I2C Controller #0 (rev 31) 00:15.1 Signal processing controller: Intel Corporation Sunrise Point-H Serial IO I2C Controller #1 (rev 31) 00:16.0 Communication controller: Intel Corporation Sunrise Point-H CSME HECI #1 (rev 31) 00:1c.0 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #1 (rev f1) 00:1c.5 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #6 (rev f1) 00:1d.0 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #9 (rev f1) 00:1d.4 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #13 (rev f1) 00:1e.0 Signal processing controller: Intel Corporation Sunrise Point-H Serial IO UART #0 (rev 31) 00:1f.0 ISA bridge: Intel Corporation Sunrise Point-H LPC Controller (rev 31) 00:1f.2 Memory controller: Intel Corporation Sunrise Point-H PMC (rev 31) 00:1f.3 Audio device: Intel Corporation Sunrise Point-H HD Audio (rev 31) 00:1f.4 SMBus: Intel Corporation Sunrise Point-H SMBus (rev 31) 01:00.0 3D controller: NVIDIA Corporation GM204M [GeForce GTX 970M] (rev a1) 3b:00.0 Network controller: Qualcomm Atheros QCA6174 802.11ac Wireless Network Adapter (rev 32) 3d:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD Controller (rev 01)