Re: Enable CONFIG_VGA_SWITCHEROO cause lspci on MSI GS60-070XCN stuck

[Daniel Vetter]

On Thu, Feb 25, 2016 at 12:18:25PM +0100, Lukas Wunner wrote:
> Hi,
> 
> On Wed, Feb 24, 2016 at 11:32:15PM +0800, Drunkard Zhang wrote:
> > I may hit a bug, when enabled CONFIG_VGA_SWITCHEROO, run lspci command
> > on MSI GS60-070XCN will stuck, it eats 100% CPU of one core, and
> > CPU/memory allocation on this system fails sometimes.
> 
> Sounds like a deadlock. Does reverting 8f12a3118f55 ("vga_switcheroo:
> Add missing locking") help?
> 
> If not I'd suspect this to be caused by a codepath in nouveau which is
> only executed if CONFIG_VGA_SWITCHEROO is enabled. I believe Maxwell
> support is still somewhat limited. Does unloading or blacklisting
> nouveau help?

http://www.spinics.net/lists/dri-devel/msg101339.html

might be relevant, no idea ...
-Daniel

> 
> Best regards,
> 
> Lukas
> 
> > 
> > I'll bisect later, put my enviroment here, hope you guys give me some hint :)
> > 
> > Tested kernel versions are: latest Linus' kernel code, 4.4.2-gentoo;
> > 
> > My hardware info:
> > 
> > 23:25:37 ~ # lspci
> > 00:00.0 Host bridge: Intel Corporation Sky Lake Host Bridge/DRAM
> > Registers (rev 07)
> > 00:01.0 PCI bridge: Intel Corporation Sky Lake PCIe Controller (x16) (rev 07)
> > 00:02.0 VGA compatible controller: Intel Corporation Device 191b (rev 06)
> > 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)
> > 00:16.0 Communication controller: Intel Corporation Sunrise Point-H
> > CSME HECI #1 (rev 31)
> > 00:17.0 SATA controller: Intel Corporation Sunrise Point-H SATA
> > Controller [AHCI mode] (rev 31)
> > 00:1c.0 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root
> > Port #1 (rev f1)
> > 00:1c.2 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root
> > Port #3 (rev f1)
> > 00:1c.3 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root
> > Port #4 (rev f1)
> > 00:1c.4 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root
> > Port #5 (rev f1)
> > 00:1d.0 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root
> > Port #9 (rev f1)
> > 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 GM107M [GeForce GTX 960M] (rev a2)
> > 02:00.0 Network controller: Qualcomm Atheros QCA6174 802.11ac Wireless
> > Network Adapter (rev 20)
> > 03:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd.
> > RTS5249 PCI Express Card Reader (rev 01)
> > 04:00.0 Ethernet controller: Qualcomm Atheros Device e0a1 (rev 10)
> > 05:00.0 PCI bridge: Intel Corporation Device 1576
> > 06:00.0 PCI bridge: Intel Corporation Device 1576
> > 06:01.0 PCI bridge: Intel Corporation Device 1576
> > 06:02.0 PCI bridge: Intel Corporation Device 1576
> > 07:00.0 System peripheral: Intel Corporation Device 1575
> > 09:00.0 USB controller: Intel Corporation Device 15b5
> > 3e:00.0 Non-Volatile memory controller: Toshiba America Info Systems
> > Device 010f (rev 01)
> > 
> > Any other hints?
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch