Talk:Dell XPS 15 9550
++ Revisions and variations
Reading through "the entire internet" about the possible hardware chips inside this model with the following specs: FHD, Microdia Webcam, 84whr/battery, SK Hynix 512GB NNVMe SSD,RTS525A PCIe CR, 32GB RAM on the 0N7TVV motherboard. (EU model).
So far 4 PCI(e) controllers not assigned any drivers, but some are still working it seems (like the memory controller), and here is the list of devices not assigned per Linux 4.8.12:
- 00:1f.2 Memory controller : Intel Corporation Sunrise Point-H PMC [8086:a121] (rev 31)
Subsystem: Dell Device [1028:06e4] Flags: fast devsel Memory at ddd2c000 (32-bit, non-prefetchable) [disabled] [size=16K]
- 00:1f.0 ISA bridge : Intel Corporation Sunrise Point-H LPC Controller [8086:a14e] (rev 31)
Subsystem: Dell Device [1028:06e4] Flags: bus master, medium devsel, latency 0
- 00:14.2 Signal processing controller : Intel Corporation Sunrise Point-H Thermal subsystem [8086:a131] (rev 31)
Subsystem: Dell Device [1028:06e4] Flags: fast devsel, IRQ 255 Memory at ddd38000 (64-bit, non-prefetchable) [size=4K] Capabilities:  Power Management version 3 Capabilities:  MSI: Enable- Count=1/1 Maskable- 64bit-
- 00:00.0 Host bridge : Intel Corporation Skylake Host Bridge/DRAM Registers [8086:1910] (rev 07)
Subsystem: Dell Device [1028:06e4] Flags: bus master, fast devsel, latency 0 Capabilities: [e0] Vendor Specific Information: Len=10 <?>
The XPS 13 9343 (Broadwell) used the following for similar devices:
- 00:1f.0 ISA bridge : Intel Corporation Wildcat Point-LP LPC Controller [8086:9cc3] (rev 03)
Subsystem: Dell Device [1028:0665] Kernel driver in use: lpc_ich
- 00:00.0 Host bridge : Intel Corporation Broadwell-U Host Bridge -OPI [8086:1604] (rev 09)
Subsystem: Dell Device [1028:0665] Kernel driver in use: bdw_uncore
All others are detected and assigned drivers on this model while everything posted here about mine, does not.
There are very limited info about the Thermal subsystem so I figured I'd try to actually dualboot wit Windows just to find out.
So basically, there are not implemented enough Skylate support OR Dell has modified their chips - I get an unknown adapter in the SMSC family while doing "sensors-detect".
Please comment if you know anything.
I've had better luck not using
acpi_backlight=vendor when the extra GPU is suppressed, so that Gnome (and other DEs) can handle the backlight without hacking around udev rules.
Passcod (talk) 11:15, 22 July 2017 (UTC)
UEFI command line arguments
I have the Dell Precision 5510 which is the same as the Dell XPS 9550. I have the same problem passing arguments to the kernel from UEFI that is described in the XPS 9360 page. This makes it hard to correctly boot a kernel using the EFISTUB. A boot loader should be used instead since it does not need to be passed any arguments. If nobody objects I'll add a section to this page detailing as much.