ERROR:root:Failed to apply core: set -59.5703125, read 0.0

[miggc1]

Happening on I7-7550U (Zbook 14U G4) when I run sudo undervolt --core -60 --cache -60.

(OS is Ubuntu 25.10)

[georgewhewell]

disabled secure boot? if so your bios/smc does not support adjustment On 30 Jan 2026, at 21:20, miggc1 ***@***.***> wrote:miggc1 created an issue (georgewhewell/undervolt#198) Happening on I7-7550U (Zbook 14U G4) —Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[miggc1]

disabled secure boot? if so your bios/smc does not support adjustment On 30 Jan 2026, at 21:20, miggc1 @.***> wrote:miggc1 created an issue (georgewhewell/undervolt#198)
Happening on I7-7550U (Zbook 14U G4)

—Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you are subscribed to this thread.Message ID: @.***>

Yep I disabled secure boot. Is there anything else I could do to unlock undervolt

[justinmcdaniel]

I'm suddenly having this same issue. I have been using undervolt without issue for several years on this laptop. I'm not sure when it stopped working, but I just happened to check today and notice it no longer can load. I receive the same error that it cannot set the values. My BIOS revision is dated 2020, so there was no recent update there.

Host: XPS 15 9570
Kernel: Linux 6.18.12-200.fc43.x86_64
CPU: Intel(R) Core(TM) i7-8750H (12) @ 4.10 GHz

Was there some change in the Linux kernel?

[SanmayJoshi]

I'm suddenly having this same issue. I have been using undervolt without issue for several years on this laptop. I'm not sure when it stopped working, but I just happened to check today and notice it no longer can load. I receive the same error that it cannot set the values. My BIOS revision is dated 2020, so there was no recent update there.

Host: XPS 15 9570 Kernel: Linux 6.18.12-200.fc43.x86_64 CPU: Intel(R) Core(TM) i7-8750H (12) @ 4.10 GHz

Was there some change in the Linux kernel?

Apparently the only reason something like this happens would be secureboot (I may be wrong). I had ported this tool to go quite a while back to get a single binary. It's called undervolt-go. It works quite ok now and has a simple gui as well. Might be worth a try.

Edit: Added the name of tool.

[justinmcdaniel]

I just tried to look into this again today and once again tried a "Factory Reset" for my bios settings which somehow did the trick. I have no idea why it suddenly quit working and why the other two times I performed a reset it did not do anything...

Perhaps I chose the "Default settings" option the other two times assuming it'd do the same thing but does not. This time I picked "Factory settings" and now I can happily undervolt once again! This is an extreme relief because this laptop's 8th gen CPU means if the CPU gets maxxed out, it throttles to 900mhz which makes it act like a netbook from 2006. With the undervolt it can indefinitely maintain a boost at 3.5ghz (base clock is 2.2ghz, so it's a rather massive boost in capability).

Cheers!