Dear experts,
following the bug report on bugzilla
https://bugzilla.kernel.org/show_bug.cgi?id=84381
the extra buttons (ACPI-driven buttons) on the R31 laptop do not work
since kernel 3.17.0.
Kernel 3.16.x worked fine. The same problem (or at least a very
similar problem) exists
on the Fujitsu-S6010 laptop.
After debugging for a while, the culprit seems to be in
arch/x86/kernel/acpi/boot.c, in specific
in acpi_gsi_to_irq(). The following changes fix this problem for at
least the S6010:
static unsigned int gsi_to_irq(unsigned int gsi)
{
unsigned int irq = gsi + NR_IRQS_LEGACY;
unsigned int i;
for (i = 0; i< NR_IRQS_LEGACY; i++) {
if (isa_irq_to_gsi[i] == gsi) {
return i;
}
}
/* Provide an identity mapping of gsi == irq
* except on truly weird platforms that have
* non isa irqs in the first 16 gsis.
*/
if (gsi>= NR_IRQS_LEGACY)
irq = gsi;
else
irq = gsi_top + gsi;
return irq;
}
/* THOR: Experimental end */
int acpi_gsi_to_irq(u32 gsi, unsigned int *irqp)
{
int irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC |
IOAPIC_MAP_CHECK);
if (irq>= 0) {
*irqp = irq;
return 0;
}
/* THOR: Experimental start */
irq = gsi_to_irq(gsi);
if (irq>= 0) {
*irqp = irq;
return 0;
}
/* THOR Experimental end */
return -1;
}
Whether this works on the R31 is yet to be determined.
The above patch has now also been tested on the IBM R31, and yes, it
also fixes the system keys there: Thinklight, volume up & down and
various other system-driven key-combinations now work again.
Could you please pick this patch up or comment on better alternatives?
Thank you,
Thomas
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