Regression in 6.8 from "ACPI: OSL: Use a threaded interrupt handler for SCI"

[Stefan Seyfried]

Hi all,

any kernels after 6.7 break my trusty old Toughbook CF-51 by rendering 
many PCI devices unusable.

I did first notice that i915 did no longer work and filed
https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/11437, there I 
was pointed to commit

commit 7a36b901a6eb0e9945341db71ed3c45c7721cfa9
Author: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Date:   Mon Nov 27 20:57:43 2023 +0100

    ACPI: OSL: Use a threaded interrupt handler for SCI

which I verified with a week-long bisecting from 6.7 to 6.8 (just for 
fun :-)

Just reverting this commit top of 6.10-rc5 (sorry, this machine is not 
very powerful so I did not try the latest git master) makes everything 
work fine again.

I get these messages in dmesg when running the broken kernels:

[  T308] genirq: Flags mismatch irq 9. 00000080 (yenta) vs. 00002080 (acpi)
[  T305] genirq: Flags mismatch irq 9. 00000080 (uhci_hcd:usb1) vs. 
00002080 (acpi)
[  T305] genirq: Flags mismatch irq 9. 00000080 (uhci_hcd:usb1) vs. 
00002080 (acpi)
[   T46] genirq: Flags mismatch irq 9. 00000080 (ehci_hcd:usb1) vs. 
00002080 (acpi)
[  T312] genirq: Flags mismatch irq 9. 00000080 (firewire_ohci) vs. 
00002080 (acpi)
[  T305] genirq: Flags mismatch irq 9. 00000080 (uhci_hcd:usb1) vs. 
00002080 (acpi)
[  T308] genirq: Flags mismatch irq 9. 00000080 (yenta) vs. 00002080 (acpi)
[  T592] genirq: Flags mismatch irq 9. 00000080 (snd_intel8x0) vs. 
00002080 (acpi)
[  T581] genirq: Flags mismatch irq 9. 00000080 (i915) vs. 00002080 (acpi)
[  T874] genirq: Flags mismatch irq 9. 00000080 (enp2s1) vs. 00002080 (acpi)

These are not present with that commit reverted.

The machine has an old Pentium M (Dothan):
toughbook:~ # cat /proc/cpuinfo
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 13
model name	: Intel(R) Pentium(R) M processor 1.60GHz
stepping	: 6
microcode	: 0x18
cpu MHz		: 1600.000
cache size	: 2048 KB
fdiv_bug	: no
f00f_bug	: no
coma_bug	: no
fpu		: yes
fpu_exception	: yes
cpuid level	: 2
wp		: yes
flags		: fpu vme de pse tsc msr mce cx8 sep mtrr pge mca cmov clflush 
dts acpi mmx fxsr sse sse2 ss tm pbe bts cpuid est tm2
bugs		: cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds 
swapgs itlb_multihit mmio_unknown
bogomips	: 3193.05
clflush size	: 32
cache_alignment	: 32
address sizes	: 36 bits physical, 32 bits virtual
power management:

and is running an i686 pae kernel:

toughbook:~ # uname -a
Linux toughbook 6.10.0-rc5-pae-seife+ #17 PREEMPT_DYNAMIC Sat Jul  6 
07:36:41 CEST 2024 i686 i686 i386 GNU/Linux

I can provide more information on request

Best regards
--
Stefan Seyfried

"For a successful technology, reality must take precedence over
 public relations, for nature cannot be fooled." -- Richard Feynman