[Galaxy Tab S2 Q&A, Help & Troubleshooting] retiredtab:
@metterschling , here's an easy test to do. When I do this, I get 20 seconds deep sleep with the Nov 5 security patch 20 R22P0 T810 build.

1. Reboot device.

2. After it boots, let display naturally timeout.

3. Once screen goes off, wait exactly 30 seconds.

4. After 30 seconds, hit home button and immediately check stats for deep sleep.

As you can see in my trace below, it shows 20 seconds of deep sleep.

12-11 16:13:24.559 3759 3800 I DreamManagerService: Entering dreamland.
12-11 16:13:24.561 3759 3800 I PowerManagerService: Dozing...
12-11 16:13:34.845 0 0 I [c0] PM : suspend entry 2023-12-11 23:13:34.845293632 UTC
12-11 16:13:34.845 0 0 D [c0] PM : Preparing system for mem sleep
12-11 16:13:55.699 3759 3849 I PowerGroup: Waking up power group from Dozing (groupId=0, uid=1000, reason=WAKE_REASON_WAKE_KEY, details=android.policy:KEY)...
12-11 16:13:55.706 3759 3849 I PowerManagerService: Waking up from Dozing (uid=1000, reason=WAKE_REASON_WAKE_KEY, details=android.policy:KEY)...

Now there is a kernel message that I don't recall seeing, but then I may not have been looking?

12-11 16:13:35.150 0 0 W : [c0] ------------[ cut here ]------------
12-11 16:13:35.150 0 0 W [c0] WARNING: at ../../../../../../kernel/samsung/universal5433/drivers/pci/pci-driver.c:488 pci_pm_suspend+0x128/0x298()
12-11 16:13:35.150 0 0 W : [c0] PCI PM: Device state not saved by dhdpcie_pci_suspend+0x0/0x18
12-11 16:13:35.150 0 0 W : [c0] Modules linked in:
12-11 16:13:35.150 0 0 W [c0] CPU: 0 PID: 5272 Comm: binder:3352_5 Not tainted 3.10.9+ #1
12-11 16:13:35.150 0 0 W [c0] Backtrace:
12-11 16:13:35.150 0 0 W : [c0] [<c0015900>] (dump_backtrace+0x0/0x128) from [<c0015b50>] (show_stack+0x18/0x1c)
12-11 16:13:35.150 0 0 W [c0] r6: c0c3d244 r5:000001e8 r4:c0360030 r3:00000000
12-11 16:13:35.150 0 0 W : [c0] [<c0015b38>] (show_stack+0x0/0x1c) from [<c09a0284>] (dump_stack+0x24/0x2c)
12-11 16:13:35.150 0 0 W : [c0] [<c09a0260>] (dump_stack+0x0/0x2c) from [<c0035828>] (warn_slowpath_fmt+0x68/0x88)
12-11 16:13:35.150 0 0 W : [c0] [<c00357c0>] (warn_slowpath_fmt+0x0/0x88) from [<c0360030>] (pci_pm_suspend+0x128/0x298)
12-11 16:13:35.150 0 0 W [c0] r3: c0518150 r2:c0c3d3c4
12-11 16:13:35.150 0 0 W [c0] r6: 00000000 r5:c0ee0148 r4:c0ef397e
12-11 16:13:35.150 0 0 W : [c0] [<c035ff08>] (pci_pm_suspend+0x0/0x298) from [<c0435494>] (dpm_run_callback.isra.7+0x44/0x130)
12-11 16:13:35.150 0 0 W [c0] r8: 00000000 r7:e5b3f468 r6:c035ff08 r5:c115cfdc r4:e5b3f468
12-11 16:13:35.150 0 0 W : [c0] [<c0435450>] (dpm_run_callback.isra.7+0x0/0x130) from [<c043658c>] (__device_suspend+0x174/0x2d0)
12-11 16:13:35.150 0 0 W [c0] r9: c11a0908 r8:e5b3f49c r7:db90bd6c r6:00000002 r5:00000000
12-11 16:13:35.150 0 0 W : r4:e5b3f468
12-11 16:13:35.150 0 0 W : [c0] [<c0436418>] (__device_suspend+0x0/0x2d0) from [<c0437130>] (dpm_suspend+0x88/0x290)
12-11 16:13:35.150 0 0 W [c0] r8: c0f2ac48 r7:c000aad0 r6:c0f2ac18 r5:e5b3f468 r4:e5b3f4cc
12-11 16:13:35.150 0 0 W : [c0] [<c04370a8>] (dpm_suspend+0x0/0x290) from [<c04375f0>] (dpm_suspend_start+0x64/0x6c)
12-11 16:13:35.151 0 0 W : [c0] [<c043758c>] (dpm_suspend_start+0x0/0x6c) from [<c0087660>] (suspend_devices_and_enter+0x80/0x5bc)
12-11 16:13:35.151 0 0 W [c0] r4: c000aad0 r3:00000200
12-11 16:13:35.151 0 0 W : [c0] [<c00875e0>] (suspend_devices_and_enter+0x0/0x5bc) from [<c0087e4c>] (pm_suspend+0x2b0/0x358)
12-11 16:13:35.151 0 0 W : [c0] [<c0087b9c>] (pm_suspend+0x0/0x358) from [<c0086c2c>] (state_store+0x64/0x7c)
12-11 16:13:35.151 0 0 W : [c0] [<c0086bc8>] (state_store+0x0/0x7c) from [<c0321618>] (kobj_attr_store+0x1c/0x28)
12-11 16:13:35.151 0 0 W [c0] r5: e3bd2f00 r4:00000003
12-11 16:13:35.151 0 0 W : [c0] [<c03215fc>] (kobj_attr_store+0x0/0x28) from [<c0199eb0>] (sysfs_write_file+0x160/0x1b8)
12-11 16:13:35.151 0 0 W : [c0] [<c0199d50>] (sysfs_write_file+0x0/0x1b8) from [<c0136178>] (vfs_write+0xbc/0x1d0)
12-11 16:13:35.151 0 0 W : [c0] [<c01360bc>] (vfs_write+0x0/0x1d0) from [<c0136844>] (SyS_write+0x48/0x84)
12-11 16:13:35.151 0 0 W : [c0] [<c01367fc>] (SyS_write+0x0/0x84) from [<c00112ec>] (__sys_trace_return+0x0/0x14)
12-11 16:13:35.151 0 0 W : [c0] ---[ end trace d234c3e929ff1559 ]---