On 2025-03-15 at 15:11:07, Salvatore Bonaccorso wrote: > Okay that is already great, thank you for the time. > > Now the next would in this case be ideally to bisect mainline between > v6.10 and v6.11-rc4 to identify the commit. On each step to build a > deb package for the kernel are hilighted at: > https://wiki.debian.org/DebianKernel/GitBisect
These directions were very helpful in compiling a kernel. Unfortunately, it led to some unusual results. The first step in the bisect was to try the merge base, which was 6.10, which was bad, at which point Git refused to continue because the problem had been fixed on the v6.10 branch. So I thought I'd try Debian's 6.9.2, which worked. Then I tried upstream 6.9, which also failed. To verify, I tried upstream 6.9.2, which failed as well. Note that I used `make oldddefconfig` with Debian's config to configure the kernel, stepping back from v6.11-rc4, so it's nearly identical to the Debian kernel (it's not signed and it doesn't have debug info, but otherwise it should be pretty much the same. In all cases, the tooling is whatever's in Debian unstable at the moment. My conclusion is thus that Debian includes some patch in the 6.9 and 6.10 series that fixes suspend and hibernate, but that patch is not included in 6.11 and newer. I will point out that I have a very similar ThinkPad X1 Carbon Gen 10 for work running Ubuntu 24.04 and their 6.8 kernel, and suspend and resume do work there (the machine is using Secure Boot, so I cannot speak to hibernation). I can try booting off a live Ubuntu 24.10 image (which contains a 6.11 kernel) or a daily build of Ubuntu 25.04 (which contains a 6.14 kernel) and report back if you think that would be helpful, say, in isolating an appropriate patch to apply. I mention this mostly because I know they do routine testing for things like suspend and resume on some ThinkPads, so presumably things do work there. Of course, if you've come to a different conclusion or have other suggestions about how to identify a cause, I'm all ears. -- brian m. carlson (they/them or he/him) Toronto, Ontario, CA
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