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* Dell XPS 13 9360: Two PCI devices with disabled power management by default
@ 2024-03-01 11:32 Paul Menzel
  2024-03-01 21:51 ` Bjorn Helgaas
  0 siblings, 1 reply; 4+ messages in thread
From: Paul Menzel @ 2024-03-01 11:32 UTC (permalink / raw)
  To: Bjorn Helgaas; +Cc: linux-pci, linux-pm

Dear Linux folks,


I noticed on the Dell XPS 13 9360 some devices do not have power 
management enabled by default. From PowerTOP:

        Bad           Runtime PM for PCI Device Intel Corporation 
Sunrise Point-LP PCI Express Root Port #1
        Bad          Runtime PM for PCI Device Intel Corporation Sunrise 
Point-LP LPC Controller

These are the two devices below:

1.    00:1c.0 PCI bridge [0604]: Intel Corporation Sunrise Point-LP PCI 
Express Root Port #1 [8086:9d10] (rev f1)
2.    00:1f.0 ISA bridge [0601]: Intel Corporation Sunrise Point-LP LPC 
Controller [8086:9d58] (rev 21)

     $ sudo dmesg | grep -e 9d10 -e 9d58
     [    0.200876] pci 0000:00:1c.0: [8086:9d10] type 01 class 0x060400 
PCIe Root Port
     [    0.202637] pci 0000:00:1f.0: [8086:9d58] type 00 class 0x060100 
conventional PCI endpoi

Is that a decision made by the system manufacturer or should the Linux 
kernel enable power management by default?


Kind regards,

Paul


$ lspci -tvnn
-[0000:00]-+-00.0  Intel Corporation Xeon E3-1200 v6/7th Gen Core 
Processor Host Bridge/DRAM Registers [8086:5904]
            +-02.0  Intel Corporation HD Graphics 620 [8086:5916]
            +-04.0  Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen 
Core Processor Thermal Subsystem [8086:1903]
            +-14.0  Intel Corporation Sunrise Point-LP USB 3.0 xHCI 
Controller [8086:9d2f]
            +-14.2  Intel Corporation Sunrise Point-LP Thermal subsystem 
[8086:9d31]
            +-15.0  Intel Corporation Sunrise Point-LP Serial IO I2C 
Controller #0 [8086:9d60]
            +-15.1  Intel Corporation Sunrise Point-LP Serial IO I2C 
Controller #1 [8086:9d61]
            +-16.0  Intel Corporation Sunrise Point-LP CSME HECI #1 
[8086:9d3a]
            +-1c.0-[01-39]----00.0-[02-39]--+-00.0-[03]--
            |                               +-01.0-[04-38]--
            |                               \-02.0-[39]----00.0  Intel 
Corporation DSL6340 USB 3.1 Controller [Alpine Ridge] [8086:15b5]
            +-1c.4-[3a]----00.0  Qualcomm Atheros QCA6174 802.11ac 
Wireless Network Adapter [168c:003e]
            +-1d.0-[3b]----00.0  SK hynix PC300 NVMe Solid State Drive 
512GB [1c5c:1284]
            +-1f.0  Intel Corporation Sunrise Point-LP LPC Controller 
[8086:9d58]
            +-1f.2  Intel Corporation Sunrise Point-LP PMC [8086:9d21]
            +-1f.3  Intel Corporation Sunrise Point-LP HD Audio [8086:9d71]
            \-1f.4  Intel Corporation Sunrise Point-LP SMBus [8086:9d23]
$ lspci -nn
00:00.0 Host bridge [0600]: Intel Corporation Xeon E3-1200 v6/7th Gen 
Core Processor Host Bridge/DRAM Registers [8086:5904] (rev 02)
00:02.0 VGA compatible controller [0300]: Intel Corporation HD Graphics 
620 [8086:5916] (rev 02)
00:04.0 Signal processing controller [1180]: Intel Corporation Xeon 
E3-1200 v5/E3-1500 v5/6th Gen Core Processor Thermal Subsystem 
[8086:1903] (rev 02)
00:14.0 USB controller [0c03]: Intel Corporation Sunrise Point-LP USB 
3.0 xHCI Controller [8086:9d2f] (rev 21)
00:14.2 Signal processing controller [1180]: Intel Corporation Sunrise 
Point-LP Thermal subsystem [8086:9d31] (rev 21)
00:15.0 Signal processing controller [1180]: Intel Corporation Sunrise 
Point-LP Serial IO I2C Controller #0 [8086:9d60] (rev 21)
00:15.1 Signal processing controller [1180]: Intel Corporation Sunrise 
Point-LP Serial IO I2C Controller #1 [8086:9d61] (rev 21)
00:16.0 Communication controller [0780]: Intel Corporation Sunrise 
Point-LP CSME HECI #1 [8086:9d3a] (rev 21)
00:1c.0 PCI bridge [0604]: Intel Corporation Sunrise Point-LP PCI 
Express Root Port #1 [8086:9d10] (rev f1)
00:1c.4 PCI bridge [0604]: Intel Corporation Sunrise Point-LP PCI 
Express Root Port #5 [8086:9d14] (rev f1)
00:1d.0 PCI bridge [0604]: Intel Corporation Sunrise Point-LP PCI 
Express Root Port #9 [8086:9d18] (rev f1)
00:1f.0 ISA bridge [0601]: Intel Corporation Sunrise Point-LP LPC 
Controller [8086:9d58] (rev 21)
00:1f.2 Memory controller [0580]: Intel Corporation Sunrise Point-LP PMC 
[8086:9d21] (rev 21)
00:1f.3 Audio device [0403]: Intel Corporation Sunrise Point-LP HD Audio 
[8086:9d71] (rev 21)
00:1f.4 SMBus [0c05]: Intel Corporation Sunrise Point-LP SMBus 
[8086:9d23] (rev 21)
01:00.0 PCI bridge [0604]: Intel Corporation DSL6340 Thunderbolt 3 
Bridge [Alpine Ridge 2C 2015] [8086:1576]
02:00.0 PCI bridge [0604]: Intel Corporation DSL6340 Thunderbolt 3 
Bridge [Alpine Ridge 2C 2015] [8086:1576]
02:01.0 PCI bridge [0604]: Intel Corporation DSL6340 Thunderbolt 3 
Bridge [Alpine Ridge 2C 2015] [8086:1576]
02:02.0 PCI bridge [0604]: Intel Corporation DSL6340 Thunderbolt 3 
Bridge [Alpine Ridge 2C 2015] [8086:1576]
39:00.0 USB controller [0c03]: Intel Corporation DSL6340 USB 3.1 
Controller [Alpine Ridge] [8086:15b5]
3a:00.0 Network controller [0280]: Qualcomm Atheros QCA6174 802.11ac 
Wireless Network Adapter [168c:003e] (rev 32)
3b:00.0 Non-Volatile memory controller [0108]: SK hynix PC300 NVMe Solid 
State Drive 512GB [1c5c:1284]

^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2024-03-02 16:22 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2024-03-01 11:32 Dell XPS 13 9360: Two PCI devices with disabled power management by default Paul Menzel
2024-03-01 21:51 ` Bjorn Helgaas
2024-03-02 16:19   ` Paul Menzel
2024-03-02 16:22     ` Arjan van de Ven

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