Messages in this thread Patch in this message | | | Date | Sun, 23 Apr 2006 16:24:28 -0400 | From | Dave Jones <> | Subject | Re: [RFC] VBE DDC bios call stalls boot |
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On Sun, Apr 23, 2006 at 12:08:27PM -0700, Yum Rayan wrote:
> There is a bios call to check if read EDID is supported. My first > thought was that before doing read EDID, video.S should first check to > see if the hardware supports the read EDID feature. Unfortunately that > bios call too ends up in the woods until I physically > disconnect/reconnect my CPU video output that feeds into the KVM.
Is this how your patch looked when you tried this ?
Dave
--- linux-2.6.15/arch/i386/boot/video.S~ 2006-01-06 01:26:06.000000000 -0500 +++ linux-2.6.15/arch/i386/boot/video.S 2006-01-06 01:28:40.000000000 -0500 @@ -1951,9 +1951,18 @@ store_edid: stosl movw $0x4f15, %ax # do VBE/DDC - movw $0x01, %bx + movw $0x00, %bx # INSTALLATION CHECK / CAPABILITIES movw $0x00, %cx - movw $0x00, %dx + movw $0x00, %dx + movw $0x140, %di + int $0x10 + cmpb $0x01, %ah + je no_edid + + movw $0x4f15, %ax # do VBE/DDC + movw $0x01, %bx # READ_EDID + movw $0x00, %cx + movw $0x00, %dx movw $0x140, %di int $0x10 --- linux-2.6.15/arch/i386/boot/video.S~ 2006-01-06 02:55:20.000000000 -0500 +++ linux-2.6.15/arch/i386/boot/video.S 2006-01-06 02:55:28.000000000 -0500 @@ -1966,6 +1966,7 @@ store_edid: movw $0x140, %di int $0x10 +no_edid: popw %di # restore all registers popw %dx popw %cx -- http://www.codemonkey.org.uk - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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