TL;DR: I was having a devil of a time with a virgin Ubuntu 24.04.3 LTS
install in desktop mode. Same symptom you guys were seeing: random
lockups and total freezes and only a physical power cycle would solve
it. When whittling down the problem, I tried a server install -- same
thing happened! Then I got lucky and ONE time I saw some i915
strangeness being reported. Since I decided that server mode headless
would be fine for my needs, I blacklisted the i915 driver ... and
everything has been stable since.
Gory details:
I decided to append this as a comment here since it seems to me it's the
same issue vs. opening a separate bug report. I'll admit though that I'm
shocked that this seems to have been around for eons.
Title: Hard system freeze on NUC8i3BEK with Ubuntu 24.04 Server, linked
to i915 kernel module.
Description:
I am experiencing frequent, random hard freezes on a server running
Ubuntu 24.04. The system is an Intel NUC8i3BEK with the latest BIOS and
Secure Boot disabled. The freezes occur seemingly at random, typically
within a few minutes of boot, and the system either reboots
automatically or requires a manual power-off.
Steps to Reproduce:
Install Ubuntu 24.04 Server on an Intel NUC8i3BEK.
Boot the system.
Observe system logs.
Expected Behavior:
The system should run stably without any freezes or unexpected reboots.
Observed Behavior:
The system freezes completely, with no new log entries being written to
syslog or the system journal. The last log entries often show a system
shutdown sequence, followed by a large time gap before a new boot is
initiated. In some instances, the log file becomes corrupted with ^@
(null) characters, indicating a hard crash.
Diagnostic Information:
dmesg / syslog output:
Prior to freezing, the logs show workqueue: ... hogged CPU
errors, specifically mentioning the i915 driver.
Example log snippets include:
workqueue: i915_hpd_poll_init_work [i915] hogged CPU for
>10000us
workqueue: output_poll_execute hogged CPU for >10000us
Hardware: Intel NUC8i3BEK
OS: Ubuntu 24.04 Server
BIOS: Latest version
Temperatures: Temperatures were monitored using lm-sensors and were
well within normal operating ranges at the time of the freezes, ruling
out overheating.
Solution/Workaround:
The issue appears to be resolved by blacklisting the i915 kernel module.
After adding blacklist i915 to /etc/modprobe.d/blacklist-i915.conf and
updating the initramfs (sudo update-initramfs -u), the system has
remained stable. This strongly suggests the bug is within the i915
driver on Ubuntu 24.04 for this specific hardware configuration.
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https://bugs.launchpad.net/bugs/1939347
Title:
Ubuntu 20.04 freeze since kernel 5.11
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