I’ve been banging my head against the wall trying to get hibernate/resume working on an older macbook. I finally found the source of the problem in dmesg
[ 2.403536] PM: Image signature found, resuming
[ 2.403541] PM: hibernation: resume from hibernation
[ 2.403545] random: crng reseeded on system resumption
[ 2.403687] Freezing user space processes
[ 2.404817] Freezing user space processes completed (elapsed 0.001 seconds)
[ 2.404821] OOM killer disabled.
[ 2.404822] Freezing remaining freezable tasks
[ 12.317097] mmc0: Timeout waiting for hardware cmd interrupt.
[ 12.319566] mmc0: sdhci: ============ SDHCI REGISTER DUMP ===========
[ 12.322068] mmc0: sdhci: Sys addr: 0x00000000 | Version: 0x00001502
[ 12.324616] mmc0: sdhci: Blk size: 0x00000000 | Blk cnt: 0x00000000
[ 12.327036] mmc0: sdhci: Argument: 0x00000c00 | Trn mode: 0x00000000
[ 12.329383] mmc0: sdhci: Present: 0x1fff0001 | Host ctl: 0x00000001
[ 12.331707] mmc0: sdhci: Power: 0x0000000f | Blk gap: 0x00000000
[ 12.333921] mmc0: sdhci: Wake-up: 0x00000000 | Clock: 0x0000fa07
[ 12.336154] mmc0: sdhci: Timeout: 0x00000000 | Int stat: 0x00018000
[ 12.338394] mmc0: sdhci: Int enab: 0x00ff0083 | Sig enab: 0x00ff0083
[ 12.340679] mmc0: sdhci: ACmd stat: 0x00000000 | Slot int: 0x00000001
[ 12.342953] mmc0: sdhci: Caps: 0x176ec8b0 | Caps_1: 0x03002177
[ 12.345228] mmc0: sdhci: Cmd: 0x0000341a | Max curr: 0x00000000
[ 12.347559] mmc0: sdhci: Resp[0]: 0x00000000 | Resp[1]: 0x00000000
[ 12.349848] mmc0: sdhci: Resp[2]: 0x00000000 | Resp[3]: 0x00000000
[ 12.352143] mmc0: sdhci: Host ctl2: 0x00000000
[ 12.354417] mmc0: sdhci: ADMA Err: 0x00000001 | ADMA Ptr: 0x0000000000000000
[ 12.356737] mmc0: sdhci: ============================================
[ 22.413506] Freezing remaining freezable tasks failed after 20.008 seconds (0 tasks refusing to freeze, wq_busy=1):
[ 22.416093] Showing freezable workqueues that are still busy:
[ 22.416098] workqueue events_freezable: flags=0x4
[ 22.416102] pwq 14: cpus=7 node=0 flags=0x0 nice=0 active=1/0 refcnt=2
[ 22.416113] in-flight: 139:mmc_rescan [mmc_core]
[ 22.416174] pwq 6: cpus=3 node=0 flags=0x0 nice=0 active=0/0 refcnt=2
[ 22.416181] inactive: pci_pme_list_scan
[ 22.416194] workqueue usb_hub_wq: flags=0x4
[ 22.416197] pwq 14: cpus=7 node=0 flags=0x0 nice=0 active=0/0 refcnt=2
[ 22.416203] inactive: hub_event
[ 22.416211] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=0/0 refcnt=2
[ 22.416216] inactive: hub_event
[ 22.416250] Restarting kernel threads ... done.
[ 22.416728] OOM killer enabled.
After chasing 4 or 5 red herrings in that output, I finally looked up what mmc0 was. Turns out its my expansion 128GB flash drive.
If i pop the flash drive out hibernate/resume works flawlessly.
I’m curious if anyone has a suggestion of how I could work around this to allow hibernate to work with the flash drive installed. Is there a command I could try running before hibernate to manually unmount and unload the flash drive modules?
Thanks much