This bug was fixed in the package linux - 6.5.0-5.5
---------------
linux (6.5.0-5.5) mantic; urgency=medium
* mantic/linux: 6.5.0-5.5 -proposed tracker (LP: #2034546)
* Packaging resync (LP: #1786013)
- [Packaging] update helper scripts
- debian/dkms-versions -- update from kernel-versions (main/d2023.08.23)
-- Andrea Righi <andrea.ri...@canonical.com> Wed, 06 Sep 2023 15:51:04
+0200
** Changed in: linux (Ubuntu Mantic)
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/2032174
Title:
Got soft lockup CPU if dell_uart_backlight is probed
Status in HWE Next:
New
Status in linux package in Ubuntu:
Fix Released
Status in linux-oem-6.5 package in Ubuntu:
Invalid
Status in linux source package in Jammy:
Invalid
Status in linux-oem-6.5 source package in Jammy:
Fix Released
Status in linux source package in Mantic:
Fix Released
Status in linux-oem-6.5 source package in Mantic:
Invalid
Bug description:
[Impact]
After v6.5, calls tty->driver->ops->chars_in_buffer() may lead to a deadlock
and got soft lockup error.
[Fix]
Do not use this function in dell-uart-backlight driver.
Try using tty->driver->ops->flush_chars() to send out the commands.
[Test Case]
1. Boot up Dell AIO system with v6.5 kernel.
2. Check dmesg and make sure there is no soft lockup error message in it.
[Where problems could occur]
There is no functional change, even if uart_flush_chars() doesn't do what we
expected, the driver should be able to keep workings, as the backlight commands
is only 3 or 4 bytes short and has little chance to stay in the queue partially.
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