https://bugzilla.kernel.org/show_bug.cgi?id=219614
Bug ID: 219614
Summary: IRQ1 override needed to let keyboard work on laptop
TongFang gm5ida/GM5HG0A
Product: ACPI
Version: 2.5
Hardware: AMD
OS: Linux
Status: NEW
Severity: normal
Priority: P3
Component: Config-Tables
Assignee: [email protected]
Reporter: [email protected]
Regression: No
Created attachment 307374
--> https://bugzilla.kernel.org/attachment.cgi?id=307374&action=edit
Patch for GM5HG0A keyboard
The keyboard from a AMD Ryzen7(8845HS) laptop bought from webshop www.skikk.eu
model "SKIKK Vanaheim 15 RTX 4060 Black"
does not work under Linux kernel 6, however 5.15.0-46 and before worked ok
(since 5.15.0-119 and beyond it does not).
In 6.13.0-rc3 the cause is code in linux-pm/drivers/acpi/resource.c,
function acpi_dev_irq_override which has has a line to return false for AMD Zen
CPU's.
when function returns true, I have a working keyboard again.
After this change the dmesg will have "ACPI: IRQ 1 override to edge, high(!)"
This function also has a table irq1_edge_low_force_override, but its entries
does not match this laptop.
However laptop has sticker at back "TongFang gm5ida", so re-branded and vendor
has changed DMI values DMI_SYS_VENDOR, DMI_SYS_VENDOR, DMI_SYS_VENDOR and
DMI_SYS_VENDOR.
To fix I see different possible solutions:
1. Let the table lists the new vendor "SKIKK.EU" with product "Vanaheim", but
this would lead to many entries if all rebranded laptops would be added.
2. See attachment for a working patch based on array DMI_OEM_STRING having
"GM5HG0A", which seems a original factory value and could match many more
rebranded laptops of this type.
However this would be the first entry using DMI_OEM_STRING search, which might
be unwanted (and expensive to search, as the arrray can be 20 entries big?)
3. There is also a possibility of checking DMI_PRODUCT_SERIAL for prefix
"GM5HG0A", however I could not find a macro to do that (eg DMI_PREFIX_MATCH).
Or is there a better solution?
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