* Stefan Unterweger on Tue, May 04, 2010 at 12:43:22AM +0200:
> As far as I understood from some ancient [FreeBSD] mailinglist
> threads, in theory it should be possible to somehow do
> something such that the kernel loads patched ACPI tables which
> have those particular bugs corrected.
Finally I've found that particular post again, and have been able
to fix the broken DSDT to some extent. With some dirty patchwork
acpi_load_dsdt now loads my custom table, and `shutdown -p -h`
succeeds in turning off the machine, without any more warnings.
A few questions'd remain, though:
- I don't suppose that there would be some "official" point in
the ACPI driver where such workarounds would "belong"? The code
looks clear enough to me, but I "speak" neither enough C nor
ACPI to be sure...
- The patch seems almost too easy to me, but I'm not yet made
that much progress in learning C. With all that memcpy going
around, I have the uneasy feeling that I might be introducing
some nasty memory holes...
The patch is against 4.6-release, since that's the version I was
planning to put on the machine.
Regards,
s//un
--- acpi.c.orig Tue May 11 18:07:10 2010
+++ acpi.c Tue May 11 17:59:56 2010
@@ -48,6 +48,8 @@
#define APMDEV_NORMAL 0
#define APMDEV_CTL 8
+#include "custom_dsdt.h"
+
#ifdef ACPI_DEBUG
int acpi_debug = 16;
#endif
@@ -889,6 +891,11 @@
}
memcpy((*dsdt)->q_data, handle.va, len);
(*dsdt)->q_table = (*dsdt)->q_data;
+
+ /* 5AEb+sk: Override the Tyan Tiger S2466's corrupt DSDT */
+ printf("Trying to override broken DSDT table...\n");
+ (*dsdt)->q_table = (struct acpi_table_header *)AmlCode;
+
acpi_unmap(&handle);
}
}
