** Tags added: kern-2638
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https://bugs.launchpad.net/bugs/1963614
Title:
mt7921e device disappear after warm boot stress
Status in HWE Next:
New
Status in linux-firmware package in Ubuntu:
Fix Released
Status in linux-firmware source package in Focal:
In Progress
Status in linux-firmware source package in Jammy:
Fix Released
Bug description:
[SRU Justification]
[Impact]
mt7921e may not appear in the bus enumeration during warm boot stress
tests.
[Fix]
This can only be fixed in the firmware.
[Test Case]
Run checkbox reboot stress tests to try trigger this issue:
$ checkbox-cli run com.canonical.certification::stress/reboot
[Where problems could occur]
While this backports proprietary fw blob, it may bring driver
compatibility issues we cannot know in the first place.
Jammy has these already, so only Focal (for oem-5.14) is nominated.
We don't have mt7921e hardware v2.1 support in Impish 5.13 kernel.
========== original bug report ==========
[Summary]
mt7921 wlan device disappear after warm reset, can be recovered by cold boot.
[Reproduce Steps]
1. do warm boot stress 100 times
2. check wifi function after stress finished
3. wifi has no function and mt7921e device disappeared
[Results]
Expected: wifi works normally
Actual: wifi broken
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