Score:0

Debugging suspend problem with pm-trace

jp flag

Have a computer which has long been unable to suspend ( hangs on resume ) and decided to try and investigate. Using the trace functionality to try and identify the problem driver I end up finding the following:

[    1.110545] PM:   Magic number: 5:864:888
[    1.110645] memory memory327: hash matches

What on earth is this telling me? It's consistent - every single resume results in the same crash and the same has being flagged - do I have dodgy memory?

I've run the memtest86+ which doesn't come up with any problems on this machine - though I can't recall if I allowed it to run for the full 8 cycles. Surely I'd be getting random crashes with dodgy memory - I'm not doing so.

David avatar
cn flag
A good start is to include your version the type of Ubuntu. Server or Desktop?
John Rogers avatar
jp flag
Sorry - It doesn't seem hugely relevant since the problem has persisted over multiple versions and fresh installs of ubuntu with the hope that resume would work again. I'm now on 21.10, but this failure to resume happened on 20.04 and 19.10. I think it last worked back on 18.04, but the machine has had various bits of new hardware and extra RAM since then
John Rogers avatar
jp flag
I have radeon graphics which I know is the bane of suspend and resume, I first suspected that as being the problem which is why I started investigating with pm_trace. I'm just really wondering if anyone can let me know what this pm_trace result means - it seems to suggest something quite basic failing in the process.
mangohost

Post an answer

Most people don’t grasp that asking a lot of questions unlocks learning and improves interpersonal bonding. In Alison’s studies, for example, though people could accurately recall how many questions had been asked in their conversations, they didn’t intuit the link between questions and liking. Across four studies, in which participants were engaged in conversations themselves or read transcripts of others’ conversations, people tended not to realize that question asking would influence—or had influenced—the level of amity between the conversationalists.