PATCH: i830: Fix int10 calls creating nasty log messages

[David Bronaugh]

Alan Hourihane wrote:

>On Mon, Feb 07, 2005 at 06:54:45PM -0800, David Bronaugh wrote:
>  
>
>>Hey all,
>>
>>Hardware: Panasonic R1N laptop, i830 video.
>>
>>I tracked down and have a patch for the following appearing in my logs:
>>
>>(EE) I810(0): unknown reason for exception
>>(II) I810(0): EAX=0x00005f1c, EBX=0x00000000, ECX=0x00000000, EDX=0x00000098
>>(II) I810(0): ESP=0x00000fac, EBP=0x00000fdc, ESI=0xffff1415, EDI=0x00002000
>>(II) I810(0): CS=0xc000, SS=0x0100, DS=0x0000, ES=0x0000, FS=0x0000, 
>>GS=0x0000
>>(II) I810(0): EIP=0x000040c6, EFLAGS=0x00033046
>>(II) stack at 0x00001fac:
>>00 00 00 00 42 41 02 32 98 00 00 00 00 00 15 14
>>07 00 00 00 26 3e 1c 5f 1e 14 07 00 66 33 00 00
>>00 00 ee 18 1c 5f 45 80 ff ff ff ff ff ff ff ff
>>40 00 00 00 00 00 00 20 00 00 00 00 00 00 98 00
>>00 00 00 00 00 00 00 00 00 00 1c 5f 00 00 00 06
>>00 00 00 32
>>(II) I810(0): code at 0x000c40c6:
>>8a 06 eb 0e 80 fd 01 75 05 67 8b 06 eb 04 67 66
>>8b 06 5b 1f c3 52 eb 11 52 8b 16 63 04 eb 0a 52
>>(EE) I810(0): cannot continue
>>(WW) I810(0): Extended BIOS function 0x5f1c not supported.
>>
>>It seems that at least with the BIOS I have, trying to call BIOS 
>>functions (at least SetBIOSPipe) while the overlay is active results in 
>>a GPF, which is the exception reported above. mplayer does this. Bad 
>>mplayer.
>>
>>My patch simply doesn't allow this to happen. Is there a better way to 
>>handle this case?
>>    
>>
>
>Does this patch work David ?
>
>Alan.
>  
>
I applied your patch; it still blows up. I think that would -probably- 
disprove the theory of the BIOS call conflicting with the overlay being 
enabled, but I'm still not totally sure (haven't traced the code; it's 
late).

Earlier (prior to your patch), I tried running I830Sync right at the 
beginning of the power management func; the problem still occurs when 
this is done. The theory there was that perhaps the BIOS is using 
immediate-mode rendering whereas everything else is going through the 
ring buffer; does I830Sync do what I think it does (ie idle the chip)?

David Bronaugh