Unix and Linux Stack Exchange
Unix and Linux Stack Exchange

Questions tagged [pci]

Peripheral Component Interconnect (PCI) is a local computer bus for attaching hardware devices in a computer.

Peripheral Component Interconnect (PCI) is a local computer bus for attaching hardware devices in a computer.

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How to check how many lanes are used by the PCIe card?

PCI Express slots on the motherboard can be wider then the number of lanes connected. For example a motherboard can have x8 slot with only x1 lane connected. On the other hand, you can insert a card using only for ex. 4 lanes to a x16 slot on the…
silk
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How to Reset/Cycle Power to a PCIe Device?

I have a PCIe device that only works correctly when the computer is fully powered off then on again. Issuing a simple reboot or reboot -p command does not appear to cycle the power to the PCIe card, which causes it not to work after the reboot. Is…
zachd1_618
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What causes this? pcieport 0000:00:03.0: PCIe Bus Error: AER / Bad TLP

I'm seeing error messages like these below: Nov 15 15:49:52 x99 kernel: pcieport 0000:00:03.0: AER: Multiple Corrected error received: id=0018 Nov 15 15:49:52 x99 kernel: pcieport 0000:00:03.0: PCIe Bus Error: severity=Corrected, type=Data Link…
MountainX
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How to find the pci slot of an usb controller in Linux?

I have a nearly common Linux machine here. So, it has a PCI (*-X, etc) bus, on that some USB controllers, and I have USB devices on these USB controllers. Similar to this: $ lspci|grep USB 00:12.0 USB controller: Advanced Micro Devices, Inc.…
peterh
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Reset a PCI Device in Linux

Is there a generic way to reset a PCI device in Linux from the command line? That is, cause the PCI bus to issue a reset command.
Jonathan
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Enabling IOMMU in the kernel for graphics card pass-through

Short question: How can I turn on the intel_iommu setting in the Linux kernel? I run a Debian host, using the grub2 bootloader. Documentation I've seen says to edit /boot/grub/menu.lst, which seems to be relevant only for grub 1.x, as I don't have…
Alex Leach
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What are PCI quirks?

I hear a lot about PCI quirks when reading about the Linux kernel, but no website explains or defines PCI quirks. What are PCI quirks?
Devyn Collier Johnson
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How does the Linux kernel handle shared IRQs?

According to what I've read so far, "when the kernel receives an interrupt, all the registered handlers are invoked." I understand that the registered handlers for each IRQ can be viewed via /proc/interrupts, and I also understand that the…
bsirang
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NVMe PCIe disk power cycling

I want to test an NVMe SSD that is connected to a PCIe slot of my motherboard. The test procedure is a specific algorithm that writes workloads to the SSD, while the SSD is exposed to radiation (e.g., neutrons). I am running Fedora 22, with kernel…
mamahuhu
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Setting BUSID in xorg.conf

From the output of lspci how do I interpret the BUSID for xorg.conf.d ? Example: 00:02.0 VGA compatible controller: Intel Corporation Skylake GT2 [HD Graphics 520] (rev 07) 01:00.0 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] Sun XT…
ng.newbie
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Understand output of `udevadm info -a -n /dev/sdb`

I plug an external HDD into my laptop. I try to find out the information by $ udevadm info -a -n /dev/sdb Udevadm info starts with the device specified by the devpath and then walks up the chain of parent devices. It prints for every device found,…
Tim
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force re-negotiation of PCIe speed on Linux

I'm working with PCIe Gen 3 cards and from time to time they seem to fall back to PCIe 1 or 2 speeds (according to lspci and also observed by the throughput). When rebooting/power cycling the machine the speed goes back to the full PCIe Gen 3 speed…
Andre Holzner
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How to measure PCI-Express bus usage?

I'm looking for a way to find out if PCIe bus is the bottleneck or not. It's not a problem to measure how much bytes was transferred through any particular NIC: Is there a way to find how much data was transferred to all the other PCIe devices…
Anthony Ananich
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Is there a command that can show if a Thunderbolt port is present on the hardware?

I'd guess lspci would be the tool to do this but I can't seem to find any identifying output. Is there a way to know from the command line whether a Thunderbolt port is present on a machine? I have one computer that I know has a Thunderbolt port…
mpr
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Internet not working without gpu installed?

Today I removed my GPU out of an Linux (Ubuntu) machine, and after that the ethernet stopped working. Running 'service networking restart' threw an error message, and when I ran 'ifconfig' only the local loopback was visible. After this I…
wouter gritter
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