[GTALUG] Suspend/resume not working with latest kernel in Debian unstable/sid

[Daniel Wayne Armstrong]

On my old C720 Chromebook, in the past I have needed to add
`GRUB_CMDLINE_LINUX_DEFAULT="tpm_tis.force=1"` to GRUB to enable
suspend/resume to work properly in Debian.


After a fresh re-install and upgrade to Debian unstable/sid, suspend/resume
is not working with kernel 5.2.9-2. System will suspend, but trying to
resume results in a hard reboot. I think the problem is with tpm_tis.



Messages in the log upon boot ...

```

$ journalctl -b | grep tpm

Sep 16 18:18:01 cruithne kernel: tpm_tis tpm_tis: 1.2 TPM (device-id 0xB,
rev-id 16)
Sep 16 18:18:01 cruithne kernel: tpm tpm0: tpm_try_transmit: send(): error
-5
Sep 16 18:18:01 cruithne kernel: tpm tpm0: A TPM error (-5) occurred
attempting to determine the timeouts
Sep 16 18:18:01 cruithne kernel: tpm_tis tpm_tis: Could not get TPM
timeouts and durations
Sep 16 18:18:01 cruithne kernel: tpm_tis 00:08: 1.2 TPM (device-id 0xB,
rev-id 16)
Sep 16 18:18:01 cruithne kernel: tpm tpm0: tpm_try_transmit: send(): error
-5
Sep 16 18:18:01 cruithne kernel: tpm tpm0: A TPM error (-5) occurred
attempting to determine the timeouts
Sep 16 18:18:01 cruithne kernel: tpm_tis 00:08: Could not get TPM timeouts
and durations
Sep 16 18:18:01 cruithne kernel: tpm_inf_pnp 00:08: Found TPM with ID
IFX0102
```

Suspend/resume *does* continue to work with kernel 4.19.67-2 (current
default in Debian stable). Messages in the log ...


```

Sep 16 18:00:38 cruithne kernel: tpm_tis 00:08: 1.2 TPM (device-id 0xB,
rev-id 16)
Sep 16 18:00:38 cruithne kernel: tpm tpm0: [Firmware Bug]: TPM interrupt
not working, polling instead
```



Removing the "tpm_tis.force=1" line from GRUB when booting into kernel
5.2.9-2 makes no difference.

A google search with "tpm tpm0" "tpm_try_transmit" "error -5" "A TPM error
(-5) occurred attempting to determine the timeouts" returns NO hits.
Dropping the last term is a bit more successful but still leads me to no
solution.

Any ideas how I might get this to work with the latest kernel 5.2*? Thanks
in advance!

-- 
Daniel Wayne Armstrong  https://www.circuidipity.com
<http://www.circuidipity.com>
Accomplish the great task by a series of small acts. -- Lao Tzu
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