[Bug 1895606] Re: Thunderbolt3 daisy chain sometimes doesn't work

This bug was fixed in the package linux-oem-5.6 - 5.6.0-1031.32

---------------
linux-oem-5.6 (5.6.0-1031.32) focal; urgency=medium

* Packaging resync (LP: #1786013)
- update dkms package versions

* CVE-2020-16119
- SAUCE: dccp: avoid double free of ccid on child socket

* CVE-2020-16120
- ovl: pass correct flags for opening real directory
- ovl: switch to mounter creds in readdir
- ovl: verify permissions in ovl_path_open()
- ovl: call secutiry hook in ovl_real_ioctl()
- ovl: check permission to open real file

linux-oem-5.6 (5.6.0-1030.30) focal; urgency=medium

* focal/linux-oem-5.6: 5.6.0-1030.30 -proposed tracker (LP: #1898714)

* Fix broken e1000e device after S3 (LP: #1897755)
- SAUCE: e1000e: Increase polling timeout on MDIC ready bit

* Fix headset jack detection on Dell UFF desktops (LP: #1897508)
- Revert "ALSA: hda: call runtime_allow() for all hda controllers"

* [SRU][OEM-5.6]Fix AMD system hang after re-plugin USBC-DP dongle
(LP: #1896716)
- drm/amd/display: Move USB-C workaround to after parameter variables are set

* alsa/hda: mic doesn't work on a HP AIO machine (LP: #1897694)
- SAUCE: ALSA: hda/realtek - set mic to auto detect on a HP AIO machine

* CVE-2020-26088
- net/nfc/rawsock.c: add CAP_NET_RAW check.

* HP Zbook Studio G7 boots into corrupted screen with PSR featured panel
(LP: #1897501)
- SAUCE: drm/i915/psr: allow overriding PSR disable param by quirk
- SAUCE: drm/dp: add DP_QUIRK_FORCE_PSR_CHIP_DEFAULT quirk to CMN prod-ID
19-15

linux-oem-5.6 (5.6.0-1029.29) focal; urgency=medium

* focal/linux-oem-5.6: 5.6.0-1029.29 -proposed tracker (LP: #1895982)

* linux-libc-dev in proposed cause seccomp_bpf from seccomp in
ubuntu_kernel_selftests to fail on F-oem-5.6 (LP: #1896008)
- seccomp: Fix ioctl number for SECCOMP_IOCTL_NOTIF_ID_VALID

* Enable LTR for endpoints behind VMD (LP: #1896598)
- SAUCE: PCI/ASPM: Enable LTR for endpoints behind VMD

* CVE-2020-14385
- xfs: fix boundary test in xfs_attr_shortform_verify

* Fix non-working NVMe after S3 (LP: #1895718)
- SAUCE: PCI: Enable ACS quirk on CML root port

* CVE-2020-12655
- xfs: add agf freeblocks verify in xfs_agf_verify

* Thunderbolt3 daisy chain sometimes doesn't work (LP: #1895606)
- thunderbolt: Retry DROM read once if parsing fails

* CVE-2020-12656
- sunrpc: svcauth_gss_register_pseudoflavor must reject duplicate
registrations.
- sunrpc: clean up properly in gss_mech_unregister()

* CVE-2020-15393
- usb: usbtest: fix missing kfree(dev->buf) in usbtest_disconnect

* CVE-2020-12771
- bcache: fix potential deadlock problem in btree_gc_coalesce

* CVE-2020-15780
- ACPI: configfs: Disallow loading ACPI tables when locked down

* CVE-2020-16166
- random32: update the net random state on interrupt and activity

* Get the extended DPCD according to the related field in the DPCD registers.
(LP: #1893752)
- drm: move DP_MAX_DOWNSTREAM_PORTS from i915 to drm core
- drm/i915/dp: Extract drm_dp_read_dpcd_caps()
- SAUCE: drm/dp_mst: Retrieve extended DPCD caps for topology manager

* CVE-2020-24394
- nfsd: apply umask on fs without ACL support

-- Thadeu Lima de Souza Cascardo <cascardo@canonical.com> Fri, 09 Oct
2020 14:54:05 -0300

** Changed in: linux-oem-5.6 (Ubuntu Focal)
Status: Fix Committed => Fix Released

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2020-12655

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2020-12656

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2020-12771

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2020-14385

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2020-15393

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2020-15780

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2020-16119

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2020-16120

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2020-16166

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2020-24394

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2020-26088

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https://bugs.launchpad.net/bugs/1895606

Title:
Thunderbolt3 daisy chain sometimes doesn't work

Status in HWE Next:
New
Status in linux package in Ubuntu:
Fix Released
Status in linux-oem-5.6 package in Ubuntu:
Invalid
Status in linux-oem-osp1 package in Ubuntu:
Invalid
Status in linux-oem-osp1 source package in Bionic:
In Progress
Status in linux source package in Focal:
Fix Committed
Status in linux-oem-5.6 source package in Focal:
Fix Released
Status in linux source package in Groovy:
Fix Released

Bug description:
[Impact]
Plug-in thunderbolt external monitor, and then plug-in thunderbolt external Hard drive on the external monitor, it sometimes can't detect the TBT storage.

[Fix]
Retry tb_drom_read_n() when failed fixes this issue.

[Test]
Verified on Dell platform with ASUS PA27AC Thunderbolt 3, and HP P800 TBT storage.

[Regression Potential]
Low, it only add 100ms delay and retry once.

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