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Bug#1050852: firmware-misc-nonfree: System crashes and reboots when i915/kbl_dmc_ver1_04.bin is present



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On Wednesday, 30 August 2023 10:34:03 CET hanzoh wrote:
> installing Debian 12 on an HP ProDesk 400 G5 Mini works fine, but gives the
> following warning in dmesg: 
> Failed to load DMC firmware i915/kbl_dmc_ver1_04.bin
> So when installing firmware-misc-nonfree, this firmware file becomes
> available and is loaded correctly. Unfortunately, this leads to the system
> crashing every few minutes.
> 
> I have narrowed it down to the following situation:
> - When firmware-misc-nonfree is installed, but I delete or rename
> /lib/firmware/i915/kbl_dmc_ver1_04.bin, the system no longer crashes 
> - With i915/kbl_dmc_ver1_04.bin present and a monitor being connected and
> turned on, the system no longer crashes 

Can you share (full, possibly anonymized) `dmesg` output when things work?

> Kernel: Linux 6.1.0-11-amd64 (SMP w/6 CPU threads; PREEMPT)

Can you try with a more recent kernel?
There hasn't been an update to the firmware, but 'in any case', the kernel 
shouldn't crash and it can be that a later kernel version fixed the crashing.

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