Kernel 4.8.15 solved the issue

kernel/README.md

@@ -1,37 +1,23 @@
 ### Reverting 'ACPI: Execute _PTS before system reboot'
 
-Starting with kernel v4.8 a bug as been introduced that prevents a correct shutdown/reboot of the machine.
+Starting with kernel v4.8.0 a bug was introduced that prevented a correct shutdown/reboot of the machine.
-Bug has been fixed then in 4.9rc7 and kernel 4.9 is not be affected by the issue anymore.
+Bug has been fixed in 4.9rc7 and then backported to 4.8; the kernel tree 4.9 and kernels >= 4.8.15 are not be affected by the issue anymore.
 
-The bad commit is:
+The bad commit was:
 
 ```
 2c85025c75dfe7ddc2bb33363a998dad59383f94
 ACPI: Execute _PTS before system reboot
 ```
 
-All kernels from 4.8.0 are affected at the moment. A special thanks to **Giampaolo** on *kbz* for bisecting sources down to the root cause.
+Kernels from 4.8.0 to 4.8.14 are affected, please upgrade to 4.8.15 or to 4.9.
-An `rpmbuild` compatible patch and an updated `spec` file are provided for reverting this commit in 4.18.
 
-On Fedora 24 and 25 is also possible to use a 4.9 kernel from rawhide:
+A special thanks to **Giampaolo** on *kbz* for bisecting sources down to the root cause.
 
-```bash
-sudo dnf install fedora-repos-rawhide
-sudo dnf --enablerepo=rawhide upgrade kernel*
-
-kernel.x86_64                         4.9.0-1.fc26                 @rawhide
-kernel-core.x86_64                    4.9.0-1.fc26                 @rawhide
-kernel-devel.x86_64                   4.9.0-1.fc26                 @rawhide
-kernel-headers.x86_64                 4.9.0-1.fc26                 @rawhide
-kernel-modules.x86_64                 4.9.0-1.fc26                 @rawhide
-kernel-modules-extra.x86_64           4.9.0-1.fc26                 @rawhide
-kernel-tools.x86_64                   4.9.0-1.fc26                 @rawhide
-kernel-tools-libs.x86_64              4.9.0-1.fc26                 @rawhide
-
-```
 ### More info
 
 - https://bugzilla.redhat.com/show_bug.cgi?id=1393513
 - https://bugzilla.kernel.org/show_bug.cgi?id=187061
 - https://bugzilla.kernel.org/show_bug.cgi?id=151631
 - https://patchwork.kernel.org/patch/9041141/
+- https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.8.15

kernel/revert_pts_before_reboot.patch

@@ -1,65 +0,0 @@
-From c68d3d1812326d3845220564b69faa720c297c73 Mon Sep 17 00:00:00 2001
-From: Daniele Viganò <daniele@vigano.me>
-Date: Thu, 10 Nov 2016 08:11:29 +0100
-Subject: [PATCH] Reverting 2c85025c75dfe7ddc2bb33363a998dad59383f94
-
----
- drivers/acpi/sleep.c | 29 ++++++-----------------------
- 1 file changed, 6 insertions(+), 23 deletions(-)
-
-diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
-index 2b38c1b..7a2e4d4 100644
---- a/drivers/acpi/sleep.c
-+++ b/drivers/acpi/sleep.c
-@@ -47,32 +47,15 @@ static void acpi_sleep_tts_switch(u32 acpi_state)
- 	}
- }
- 
--static void acpi_sleep_pts_switch(u32 acpi_state)
--{
--	acpi_status status;
--
--	status = acpi_execute_simple_method(NULL, "\\_PTS", acpi_state);
--	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
--		/*
--		 * OS can't evaluate the _PTS object correctly. Some warning
--		 * message will be printed. But it won't break anything.
--		 */
--		printk(KERN_NOTICE "Failure in evaluating _PTS object\n");
--	}
--}
--
--static int sleep_notify_reboot(struct notifier_block *this,
-+static int tts_notify_reboot(struct notifier_block *this,
- 			unsigned long code, void *x)
- {
- 	acpi_sleep_tts_switch(ACPI_STATE_S5);
--
--	acpi_sleep_pts_switch(ACPI_STATE_S5);
--
- 	return NOTIFY_DONE;
- }
- 
--static struct notifier_block sleep_notifier = {
--	.notifier_call	= sleep_notify_reboot,
-+static struct notifier_block tts_notifier = {
-+	.notifier_call	= tts_notify_reboot,
- 	.next		= NULL,
- 	.priority	= 0,
- };
-@@ -916,9 +899,9 @@ int __init acpi_sleep_init(void)
- 	pr_info(PREFIX "(supports%s)\n", supported);
- 
- 	/*
--	 * Register the sleep_notifier to reboot notifier list so that the _TTS
--	 * and _PTS object can also be evaluated when the system enters S5.
-+	 * Register the tts_notifier to reboot notifier list so that the _TTS
-+	 * object can also be evaluated when the system enters S5.
- 	 */
--	register_reboot_notifier(&sleep_notifier);
-+	register_reboot_notifier(&tts_notifier);
- 	return 0;
- }
--- 
-2.7.4
-