This bug was fixed in the package linux-oem-6.11 - 6.11.0-1025.25
---------------
linux-oem-6.11 (6.11.0-1025.25) noble; urgency=medium
* noble/linux-oem-6.11: 6.11.0-1025.25 -proposed tracker (LP:
#2114304)
* Packaging resync (LP: #1786013)
- [Packaging] update variants
* No IP Address assigned after hot-plugging Ethernet cable on HP Platform
(LP: #2115393)
- SAUCE: Revert "e1000e: change k1 configuration on MTP and later
platforms"
* Gnome freeze during sleepgraph testing (LP: #2115392)
- drm/xe/sched: stop re-submitting signalled jobs
* intel-ish-hid keeps timeout while accessing it during suspend
(LP: #2115390)
- SAUCE: HID: intel-ish-hid: Increase ISHTP resume ack timeout to 300ms
* Enable the mute and mic-mute LEDs on HP Elitebook 6 laptops (LP: #2115198)
- ALSA: hda/realtek: fix mute/micmute LEDs for HP EliteBook 6 G1a
* auxiliary intel_ipu6.psys.40: deferred probe pending: (reason unknown)
(LP: #2115083)
- [Packaging] debian.oem/dkms-versions -- bump ipu6 version
* Handle IOMMU IVRS entries with mismatched UID on AMD Strix or newer
platforms (LP: #2115174)
- iommu/amd: Allow matching ACPI HID devices without matching UIDs
* wrong packet header size calculation (LP: #2102186)
- [Packaging] debian.oem/dkms-versions -- bump usbio version
* dmesg flooded with errors: amdgpu: DP AUX transfer fail:4 (LP: #2115238)
- drm/amd/display: Correct the reply value when AUX write incomplete
- drm/amd/display: Avoid flooding unnecessary info messages
* Print last reset reason into kernel log on AMD Zen platforms
(LP: #2115171)
- i2c: piix4: Make CONFIG_I2C_PIIX4 dependent on CONFIG_X86
- i2c: piix4, x86/platform: Move the SB800 PIIX4 FCH definitions to
<asm/amd/fch.h>
- platform/x86/amd/pmc: Use FCH_PM_BASE definition
- Documentation: Add AMD Zen debugging document
- x86/CPU/AMD: Print the reason for the last reset
* [SRU] Add support for new hotkey of F9 on Thinkpad X9 (LP: #2115022)
- platform/x86: thinkpad-acpi: Add support for new hotkey for camera
shutter switch
* HW accelerated video playback causes VCN timeout on VCN 4.0.5 (AMD Strix)
(LP: #2112582)
- drm/amdgpu: read back register after written for VCN v4.0.5
* Unexpected system reboot at loading GUI session on some AMD platforms
(LP: #2112462)
- drm/amdgpu/hdp4: use memcfg register to post the write for HDP flush
- drm/amdgpu/hdp5: use memcfg register to post the write for HDP flush
- drm/amdgpu/hdp5.2: use memcfg register to post the write for HDP flush
- drm/amdgpu/hdp6: use memcfg register to post the write for HDP flush
- drm/amdgpu/hdp7: use memcfg register to post the write for HDP flush
* fwts s3 test shows High Failures: last_hw_sleep less than 70% on AMD
platforms (LP: #2112290)
- SAUCE: platform/x86/amd: pmc: Clear metrics table at start of cycle
* ASoC: rt1320: fix speaker noise when volume bar is 100% (LP: #2112350)
- SAUCE: ASoC: rt1320: fix speaker noise when volume bar is 100%
[ Ubuntu: 6.11.0-29.29 ]
* oracular/linux: 6.11.0-29.29 -proposed tracker (LP: #2114305)
* Packaging resync (LP: #1786013)
- [Packaging] update variants
- [Packaging] update annotations scripts
* CVE-2025-37890
- net_sched: hfsc: Fix a UAF vulnerability in class with netem as child
qdisc
- sch_hfsc: Fix qlen accounting bug when using peek in hfsc_enqueue()
- net_sched: hfsc: Address reentrant enqueue adding class to eltree twice
* raid1: Fix NULL pointer dereference in process_checks() (LP: #2112519)
- md/raid1: Add check for missing source disk in process_checks()
* CVE-2025-37798
- sch_htb: make htb_qlen_notify() idempotent
- sch_htb: make htb_deactivate() idempotent
- sch_drr: make drr_qlen_notify() idempotent
- sch_hfsc: make hfsc_qlen_notify() idempotent
- sch_qfq: make qfq_qlen_notify() idempotent
- sch_ets: make est_qlen_notify() idempotent
- codel: remove sch->q.qlen check before qdisc_tree_reduce_backlog()
* CVE-2025-37997
- netfilter: ipset: fix region locking in hash types
-- Kuan-Ying Lee <[email protected]> Thu, 26 Jun 2025
13:25:35 +0800
** Changed in: linux-oem-6.11 (Ubuntu Noble)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/2112462
Title:
Unexpected system reboot at loading GUI session on some AMD platforms
Status in HWE Next:
New
Status in linux package in Ubuntu:
Fix Released
Status in linux-oem-6.11 package in Ubuntu:
Invalid
Status in linux-oem-6.14 package in Ubuntu:
Invalid
Status in linux-oem-6.8 package in Ubuntu:
Invalid
Status in linux source package in Noble:
In Progress
Status in linux-oem-6.11 source package in Noble:
Fix Released
Status in linux-oem-6.14 source package in Noble:
Fix Released
Status in linux-oem-6.8 source package in Noble:
Won't Fix
Status in linux source package in Oracular:
In Progress
Status in linux-oem-6.11 source package in Oracular:
Invalid
Status in linux-oem-6.14 source package in Oracular:
Invalid
Status in linux-oem-6.8 source package in Oracular:
Invalid
Status in linux source package in Plucky:
Fix Committed
Status in linux-oem-6.11 source package in Plucky:
Invalid
Status in linux-oem-6.14 source package in Plucky:
Invalid
Status in linux-oem-6.8 source package in Plucky:
Invalid
Status in linux source package in Questing:
Fix Released
Status in linux-oem-6.11 source package in Questing:
Invalid
Status in linux-oem-6.14 source package in Questing:
Invalid
Status in linux-oem-6.8 source package in Questing:
Invalid
Bug description:
[SRU Justification]
[ Impact ]
AMD Strix Halo devices experience unexpected reboots while starting
GUI session every boot.
This is caused by:
* 689275140cb8e drm/amdgpu/hdp7.0: do a posting read when flushing HDP
* abe1cbaec6cfe drm/amdgpu/hdp6.0: do a posting read when flushing HDP
* f756dbac1ce1d drm/amdgpu/hdp5.2: do a posting read when flushing HDP
* cf424020e040b drm/amdgpu/hdp5.0: do a posting read when flushing HDP
* c9b8dcabb52af drm/amdgpu/hdp4.0: do a posting read when flushing HDP
And fixed by:
* 5a11a27677311 drm/amdgpu/hdp7: use memcfg register to post the write for
HDP flush
* ca28e80abe421 drm/amdgpu/hdp6: use memcfg register to post the write for
HDP flush
* dbc988c689333 drm/amdgpu/hdp5.2: use memcfg register to post the write for
HDP flush
* 0e33e0f339b91 drm/amdgpu/hdp5: use memcfg register to post the write for
HDP flush
* f690e3974755a drm/amdgpu/hdp4: use memcfg register to post the write for
HDP flush
[ Test Plan ]
1. Install -proposed kernel
2. Reboot to the installed kernel and check if the device may finish boot
process to GUI session.
[ Where problems could occur ]
No. This fix a problem when reading back the whole mapped
KFD_MMIO_REMAP_HDP_MEM_FLUSH_CNTL register by reading another register
that also triggers the flush.
[ Other Info ]
The causing commits were first committed to v6.13-rc1 , and have also been
backported to v6.12.5, v6.6.69, v6.1.120. The fixes are available in v6.15-rc6,
also backported to v6.14.7, v6.12.29, v6.6.91, v6.1.139, therefore this affects
following Ubuntu kernels:
* linux/plucky: all (currently 6.14.0-22.22)
* linux-oem-6.14/noble: all (currently 6.14.0-1005.5)
* linux/oracular: 6.11.0-20.20 to latest (currently 6.11.0-28.28)
* linux-oem-6.11/noble: 6.11.0-1017.17 to latest (currently 6.11.0-1024.24)
* linux/noble: 6.8.0-58.60 to latest (currently 6.8.0-62.65)
* linux-oem-6.8/noble: 6.8.0-1026.26 to latest (currently 6.8.0-1029.29)
Nominate for linux/noble, linux-oem-6.8/noble, linux/oracular, linux-
oem-6.11/noble, linux/plucky, and linux-oem-6.14/noble.
========== original bug report ==========
With 5 v6.13-rc1 commits , also backported to v6.12.5, v6.6.69, v6.1.120,
some (at least AMD Strix Halo) devices may experience unexpected reboots while
starting GUI session every boot:
* 689275140cb8e drm/amdgpu/hdp7.0: do a posting read when flushing HDP
* abe1cbaec6cfe drm/amdgpu/hdp6.0: do a posting read when flushing HDP
* f756dbac1ce1d drm/amdgpu/hdp5.2: do a posting read when flushing HDP
* cf424020e040b drm/amdgpu/hdp5.0: do a posting read when flushing HDP
* c9b8dcabb52af drm/amdgpu/hdp4.0: do a posting read when flushing HDP
The fixes are available in v6.15-rc6, also backported to v6.14.7, v6.12.29,
v6.6.91, v6.1.139:
* 5a11a27677311 drm/amdgpu/hdp7: use memcfg register to post the write for
HDP flush
* ca28e80abe421 drm/amdgpu/hdp6: use memcfg register to post the write for
HDP flush
* dbc988c689333 drm/amdgpu/hdp5.2: use memcfg register to post the write for
HDP flush
* 0e33e0f339b91 drm/amdgpu/hdp5: use memcfg register to post the write for
HDP flush
* f690e3974755a drm/amdgpu/hdp4: use memcfg register to post the write for
HDP flush
This affects following Ubuntu kernels:
* linux/plucky: all (currently 6.14.0-22.22)
* linux-oem-6.14/noble: all (currently 6.14.0-1005.5)
* linux/oracular: 6.11.0-20.20 to latest (currently 6.11.0-28.28)
* linux-oem-6.11/noble: 6.11.0-1017.17 to latest (currently 6.11.0-1024.24)
* linux/noble: 6.8.0-58.60 to latest (currently 6.8.0-62.65)
* linux-oem-6.8/noble: 6.8.0-1026.26 to latest (currently 6.8.0-1029.29)
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