http://bugzilla.kernel.org/show_bug.cgi?id=10138
Summary: HP t5710 builtin radeon interrupt routed incorrectly
Product: ACPI
Version: 2.5
KernelVersion: 2.6.25-rc3
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Config-Interrupts
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
CC: [EMAIL PROTECTED]
Latest working kernel version: none
Earliest failing kernel version: all <= 2.6.25-rc3
Hardware Environment: HP t5710 thin client
The AWRDACPI TM8000 DSDT, OEM revision 0x1003 (4099), has an incorrect _PRT
entry for the Radeon video device on the motherboard. The _PRT claims PCI
interrupt 0000:01:00.0[A] is connected to LNK1, but it is really connected to
LNK3.
When the X Radeon driver (with DRI enabled) starts, we get a flood of radeon
interrupts on IRQ 3, and we eventually disable it, which also kills the USB
mouse and keyboard that are also on IRQ 3:
[drm] Setting GART location based on new memory map
[drm] writeback test succeeded in 0 usecs
irq 3: nobody cared (try booting with the "irqpoll" option)
[<c01042ca>] show_trace_log_lvl+0x1a/0x30
[<c0104882>] show_trace+0x12/0x20
[<c0104936>] dump_stack+0x16/0x20
[<c012d899>] __report_bad_irq+0x39/0x80
[<c012da58>] note_interrupt+0x178/0x1c0
[<c012e233>] handle_level_irq+0x73/0xa0
[<c0105809>] do_IRQ+0x79/0xa0
[<c0103e3b>] common_interrupt+0x23/0x28
[<c0149a92>] do_lookup+0x22/0x140
[<c014ae12>] __link_path_walk+0x252/0x9f0
[<c014b5f9>] link_path_walk+0x49/0xc0
[<c014b8d6>] do_path_lookup+0x156/0x170
[<c014c2c4>] __path_lookup_intent_open+0x44/0x80
[<c014c381>] path_lookup_open+0x21/0x30
[<c014c467>] open_namei+0x67/0x540
[<c0142996>] do_filp_open+0x26/0x40
[<c01429f3>] do_sys_open+0x43/0xd0
[<c0142abc>] sys_open+0x1c/0x20
[<c0103cc4>] syscall_call+0x7/0xb
=======================
handlers:
[<c02298d0>] (usb_hcd_irq+0x0/0x60)
[<c02298d0>] (usb_hcd_irq+0x0/0x60)
Disabling IRQ #3
Patching the DSDT to report LNK3 instead of LNK1 works around the problem, but
is obviously not a good solution for end-users.
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