In message <200504210019.05517.phil@cs.wwu.edu>, Phil Nelson writes:
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>Hi,
>    I've been trying to upgrade my -current from 2.99.16 to 3.99.3 but I'm 
>having problems with lost interrupts on the CD drive which makes it unusable.
>These problems do not exist in 2.99.16.
>
>Platform:  Dell Latitude D600 laptop, i386.  
>dmesg extracts:
>
>piixide0 at pci0 dev 31 function 1
>piixide0: Intel 82801DBM IDE Controller (ICH4-M) (rev. 0x01)
>piixide0: bus-master DMA support present
>piixide0: primary channel wired to compatibility mode
>piixide0: primary channel interrupting at irq 14
>atabus0 at piixide0 channel 0
>piixide0: secondary channel wired to compatibility mode
>piixide0: secondary channel interrupting at irq 15
>atabus1 at piixide0 channel 1
>...
>atapibus0 at atabus1: 2 targets
>piixide0:1:0: lost interrupt
>        type: ata tc_bcount: 512 tc_skip: 0
>cd0 at atapibus0 drive 0: <SAMSUNG CDRW/DVD SN-324F, , U203> cdrom removable
>piixide0:1:0: lost interrupt
>        type: ata tc_bcount: 512 tc_skip: 0
>piixide0:1:0: lost interrupt
>        type: ata tc_bcount: 512 tc_skip: 0
>cd0: 32-bit data port
>piixide0:1:0: lost interrupt
>        type: ata tc_bcount: 0 tc_skip: 0
>cd0: drive supports PIO mode 4piixide0:1:0: lost interrupt
>        type: ata tc_bcount: 0 tc_skip: 0
>, DMA mode 2piixide0:1:0: lost interrupt
>        type: ata tc_bcount: 0 tc_skip: 0
>, Ultra-DMA mode 2 (Ultra/33)
>cd0(piixide0:1:0): using PIO mode 4, Ultra-DMA mode 2 (Ultra/33) (using DMA)
>
>Has anyone else had this problem?   Any known solutions?
>
>

I've sometimes had problems like that with ACPI, though I don't think 
I've seen them recently.

		--Prof. Steven M. Bellovin, http://www.cs.columbia.edu/~smb