Intel pentium 8505 support

[gyrex]

Did you try C3 in the meantime?

Nah, I'm ok with C1 and if it ain't broke...

 

[celemine1gig]

If you are fine with the higher idle consumption, then why not. I was just curious.

 

[gannam]

Changing the BIOS settings don't make much of a difference since they're overwritten by the kernel. The changes to P & CSTATES and need to be made in GRUB for them to take effect and this can be confirmed by running lscpu.

My 8505 is rock solid (low ~30C temps and uptime over a month) after changing GRUB to:

GRUB_CMDLINE_LINUX_DEFAULT="quiet intel_idle.max_cstate=1 processor.max_cstate=1 pcie_aspm=off"

and loading the latest Intel Microcode (20260210) from github.

Everything was running fine, with my idle in the low 40's (okay for ambient being 25-28C). It looks like a recent update introduced the previous stability issues on Friday. (Looked at logs and the privileged LXC wasn't running when it crashed.)

I verified that the latest microcode was installed and edited the GRUB line as you had indicated. Everything seemed to be running as it was before...until I installed the latest kernel. (7.0.14-20-pve (2026-09-24T10:43Z)) The CPU is now idling at 76-80C with the cores cycling between 3GHz and 4GHz with 400MHz core clocks sporadically being used for a second or two. The system appears to be stable, but I've only had it up for a few hours. My previous uptime was over 70 days. I've tried adjusting the governor, but no change. If I have time tonight I'll try booting with the previous kernel to confirm whether or not the behavior is tied to the newest kernel.