This bug is awaiting verification that the linux/6.2.0-34.34 kernel in
-proposed solves the problem. Please test the kernel and update this bug
with the results. If the problem is solved, change the tag
'verification-needed-lunar-linux' to 'verification-done-lunar-linux'. If
the problem still exists, change the tag 'verification-needed-lunar-
linux' to 'verification-failed-lunar-linux'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: kernel-spammed-lunar-linux-v2 verification-needed-lunar-linux

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https://bugs.launchpad.net/bugs/2032767

Title:
  Fix ACPI TAD  on some Intel based systems

Status in HWE Next:
  New
Status in linux package in Ubuntu:
  Confirmed
Status in linux-oem-6.1 package in Ubuntu:
  Invalid
Status in linux-oem-6.5 package in Ubuntu:
  Invalid
Status in linux source package in Jammy:
  Won't Fix
Status in linux-oem-6.1 source package in Jammy:
  Fix Committed
Status in linux-oem-6.5 source package in Jammy:
  Fix Released
Status in linux source package in Lunar:
  Fix Committed
Status in linux-oem-6.1 source package in Lunar:
  Invalid
Status in linux-oem-6.5 source package in Lunar:
  Invalid
Status in linux source package in Mantic:
  Confirmed
Status in linux-oem-6.1 source package in Mantic:
  Invalid
Status in linux-oem-6.5 source package in Mantic:
  Invalid

Bug description:
  [Impact]
  ACPI TAD doesn't really work on several systems. When accessing TAD
  interface via sysfs, like setting/getting realtime, it also causes
  errors:
  [  478.255453] ACPI Error: No handler for Region [RTCM] (00000000a8d2dd39) 
[SystemCMOS] (20230331/evregion-130)
  [  478.255458] ACPI Error: Region SystemCMOS (ID=5) has no handler 
(20230331/exfldio-261)
  [  478.255461] Initialized Local Variables for Method [_GRT]:
  [  478.255461]   Local1: 00000000f182542c <Obj>           Integer 
0000000000000000
  [  478.255464] No Arguments are initialized for method [_GRT]
  [  478.255465] ACPI Error: Aborting method \_SB.AWAC._GRT due to previous 
error (AE_NOT_EXIST) (20230331/psparse-529)

  [Fix]
  Let the driver to install a handler for its SystemCMOS region.
  The spec on whether certain devices can use SystemCMOS or not is quite
  vague, so follow the de facto implementation, Windows :)

  [Test] 
  Once the patch is applied, setting and getting realtime through TAD
  sysfs work, and there's no more error in dmesg.

  [Where problems could occur]
  Now ACPI TAD driver also depends on ACPI RTC driver, so the memory usage
  will go up slightly.

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