http://bugzilla.kernel.org/show_bug.cgi?id=8641
Summary: interrupts not properly handled for VIA K8M00 /
UniChrome Pro
Product: Drivers
Version: 2.5
KernelVersion: 2.6.21.5
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Video(DRI)
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
Most recent kernel where this bug did not occur: none
Distribution: Gentoo
Hardware Environment: Twinhead EFIO E12KT
Software Environment:
Problem Description:
Appears in all current vanilla kernels.
Driver loads, enables VIA_IRQ_GLOBAL, VIA_IRQ_DMA0_TD and VIA_IRQ_DMA1_TD. VIA
hardware keeps firing interrupts, but neither of VIA_IRQ_DMA[01]_TD_PENDING is
set in the IRQ status register. Instead, the bit 11 (0x0400) is always set.
Rewriting the status register doesn't clear the interrupt. I get 1 Mio
interrupt events / 10sec with these symptoms. The kernel soon disables the
interrupt and thus stops other hardware from working.
irqpoll option hangs the kernel.
Steps to reproduce:
On a system with K8M800 northbridge and integrated graphics, load teh via-agp
and via modules. Observe that the kernel says:
irq 5: nobody cared (try booting with the "irqpoll" option)
[<c0138d54>] __report_bad_irq+0x24/0x80
[<c0138f9d>] note_interrupt+0x1ed/0x220
[<c0138425>] handle_IRQ_event+0x25/0x50
[<c0139850>] handle_level_irq+0x80/0xb0
[<c0105b68>] do_IRQ+0x38/0x70
[<c0103fe3>] common_interrupt+0x23/0x28
=======================
handlers:
[<c02fe4a0>] (usb_hcd_irq+0x0/0x60)
[<c02893e0>] (via_driver_irq_handler+0x0/0x1c0)
Disabling IRQ #5
Workaround:
none found (other than disabling VIA_IRQ_GLOBAL
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