Thanks for the great work!
Hotplugging thunderbolt docks definitely work better, but I still have a
couple issues.
Before I start, here is some info about my setup.
I use KDE on Arch Linux, but it shouldn't affect the problem. uname -a prints:
Linux MyPC 6.1.1-arch1-1 #1 SMP PREEMPT_DYNAMIC Wed, 21 Dec 2022 22:27:55 +0000
x86_64 GNU/Linux
Regarding BIOS, I am running the non-standard Lenovo C940 BIOS that some
Lenovo engineer temporarily released on their forum to fix the speakers
on Linux (version AUCN57WW).
My dock is a "Kensington SD5500T/SD5550T Thunderbolt 3 and USB-C Docking
Station".
But now to the issues.
First: The fix currently mainlined in the kernel doesn't work for me.
After comparing the file arch/x86/pci/acpi.c on github with the result
of dmidecode (see below), I think it the check for DMI_PRODUCT_VERSION
should be changed to checking the product family. It could potentially
be related to my non-standard BIOS version, but I can't check that.
Second: Since the current fix didn't apply to my computer, I tried compiling
the kernel myself and applying the patch from comment #62.
My dock has both a USB hub and display outputs, and on the non-patched kernel,
if I tried hotplugging it, the USB hub didn't work, but the external displays
always did (and sometimes the computer crashed).
On the patched kernel, if I hotplug, the USB hub always works, and I haven't
experienced any crashes, but the external displays aren't recognized. More
specifically, if the dock is unplugged when booting and I then hotplug it, they
aren't recognized. If instead the computer is docked while booting, the
displays work, and if I unplug the dock and then replug it within ~5-10
seconds, the displays are recognized again. If I instead have the dock
unplugged for a minute or so, the displays are not recognized when replugging
the dock.
I have tried running lspci -vv, and the output differs between if the computer
was docked on boot and after it was un- and replugged, but it doesn't differ
between if the external displays are recognized or not.
I would attach dmesg and lspci -xxxx, but I cannot figure out how to
create attachments, so please help me if you need that info. And please
specify under which conditions you want the logs. :)
--- dmidecode ---
Handle 0x0001, DMI type 1, 27 bytes
System Information
Manufacturer: LENOVO
Product Name: 81Q9
Version: Yoga C940
Serial Number: [...]
UUID: [...]
Wake-up Type: Power Switch
SKU Number: LENOVO_MT_81Q9_BU_idea_FM_Yoga C940-14IIL
Family: Yoga C940-14IIL
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https://bugs.launchpad.net/bugs/1860284
Title:
thinkpad thunderbolt 3 dock gen2 with pci memory allocation errors on
Yoga C940 unless plugged in before boot
Status in Linux:
Confirmed
Status in linux package in Ubuntu:
Confirmed
Bug description:
I have thinkpad thunderbolt 3 dock gen2 dock I am trying to use with a
New Lenovo Yoga C940 laptop.
- The dock works fine when plugged-in before boot.
- The dock does NOT work when plugged after the system booted.
- The dock does NOT work when plugged-in at boot, subsequently unplugged and
plugged back in.
When it fails, it fails with memory allocation messages such as:
[ 342.507320] pci 0000:2b:00.0: BAR 14: no space for [mem size 0x0c200000]
[ 342.507323] pci 0000:2b:00.0: BAR 14: failed to assign [mem size
0x0c200000]
Things I tried:
- Kernel mainline 5.4.12, same symptoms
- Kernel mainline 5.5.-rc6,
same symptoms.
- Plugging it after powering up the laptop, but at the grub screen before
boot. In this case the dock works fine after boot.
Other potentially useful information to narrow it down:
- The tests were done with only an ethernet cable and power plugged into the
dock to minimize the number of moving parts...
- Dock and laptop both have the very latest firmware as of 2020-01-17.
- The displayport part of the dock always work, but all other ports (USB,
ethernet, card readers fail) when plugged-in after boot.
- Doesn't seem to be a thunderbolt authorization problem:
benoitg@benoitg-Yoga-C940:~$ boltctl
? Lenovo ThinkPad Thunderbolt 3 Dock
?? type: peripheral
?? name: ThinkPad Thunderbolt 3 Dock
?? vendor: Lenovo
?? uuid: 001730c5-7042-0801-ffff-ffffffffffff
?? status: authorized
? ?? domain: c06e823d-af8a-8680-ffff-ffffffffffff
? ?? authflags: none
?? authorized: Sun Jan 19 17:41:04 2020
?? connected: Sun Jan 19 17:41:04 2020
?? stored: Thu Jan 16 07:27:43 2020
?? policy: iommu
?? key: no
ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: linux-image-5.3.0-26-generic 5.3.0-26.28
ProcVersionSignature: Ubuntu 5.3.0-26.28-generic 5.3.13
Uname: Linux 5.3.0-26-generic x86_64
ApportVersion: 2.20.11-0ubuntu8.2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: benoitg 1182 F.... pulseaudio
CurrentDesktop: KDE
Date: Sun Jan 19 12:38:17 2020
InstallationDate: Installed on 2020-01-16 (3 days ago)
InstallationMedia: Kubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
MachineType: LENOVO 81Q9
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.3.0-26-generic
root=UUID=078b76d6-6b72-4de4-9e10-f6ea33d9bc1a ro
RelatedPackageVersions:
linux-restricted-modules-5.3.0-26-generic N/A
linux-backports-modules-5.3.0-26-generic N/A
linux-firmware 1.183.3
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/22/2019
dmi.bios.vendor: LENOVO
dmi.bios.version: AUCN45WW
dmi.board.asset.tag: NO Asset Tag
dmi.board.name: LNVNB161216
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40709 WIN
dmi.chassis.asset.tag: NO Asset Tag
dmi.chassis.type: 31
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo Yoga C940-14IIL
dmi.modalias:
dmi:bvnLENOVO:bvrAUCN45WW:bd08/22/2019:svnLENOVO:pn81Q9:pvrLenovoYogaC940-14IIL:rvnLENOVO:rnLNVNB161216:rvrSDK0J40709WIN:cvnLENOVO:ct31:cvrLenovoYogaC940-14IIL:
dmi.product.family: Yoga C940-14IIL
dmi.product.name: 81Q9
dmi.product.sku: LENOVO_MT_81Q9_BU_idea_FM_Yoga C940-14IIL
dmi.product.version: Lenovo Yoga C940-14IIL
dmi.sys.vendor: LENOVO
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