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Date: Sat, 17 Feb 2007 00:35:52 -0800 (PST) From: Zwane Mwaikambo <zwane@...radead.org> To: Andrew Morton <akpm@...ux-foundation.org> Cc: Linux Kernel <linux-kernel@...r.kernel.org>, Andi Kleen <ak@...e.de>, Tobias Hain <tobias.hain@....de>, "H. Peter Anvin" <hpa@...or.com> Subject: Re: [PATCH] Don't probe for DDC on VBE1.2 On Fri, 16 Feb 2007, Andrew Morton wrote: > On Fri, 16 Feb 2007 06:39:45 -0800 (PST) Zwane Mwaikambo <zwane@...radead.org> wrote: > > > On Thu, 15 Feb 2007, Andrew Morton wrote: > > > > > It's not an X problem - the screen is black immediately upon loading the > > > kernel. > > > > > > But I guess you knew that and you're just after display info: > > > http://userweb.kernel.org/~akpm/Xorg.0.log.txt > > > > Thanks, the X log told me your VBE version. I tried to reproduce it on my > > thinkpad which seems to have a very similar video setup to no avail, Could > > you test the following on the VAIO? If this isn't the case, i suspect i'm > > corrupting your modelist. > > It's still all black. Ok it looks like i was corrupting the modelist. The following should take care of your VAIO, but i haven't tested the failure case as Tobias is away this weekend. Index: linux-2.6.20-mm1/arch/i386/boot/video.S =================================================================== RCS file: /home/cvsroot/linux-2.6.20-mm1/arch/i386/boot/video.S,v retrieving revision 1.1.1.1 diff -u -p -B -r1.1.1.1 video.S --- linux-2.6.20-mm1/arch/i386/boot/video.S 15 Feb 2007 17:35:57 -0000 1.1.1.1 +++ linux-2.6.20-mm1/arch/i386/boot/video.S 17 Feb 2007 08:29:11 -0000 @@ -571,6 +571,16 @@ setr1: lodsw jmp _m_s check_vesa: +#ifdef CONFIG_FIRMWARE_EDID + leaw modelist+1024, %di + movw $0x4f00, %ax + int $0x10 + cmpw $0x004f, %ax + jnz setbad + + movw 4(%di), %ax + movw %ax, vbe_version +#endif leaw modelist+1024, %di subb $VIDEO_FIRST_VESA>>8, %bh movw %bx, %cx # Get mode information structure @@ -1945,6 +1955,9 @@ store_edid: rep stosl + cmpw $0x0200, vbe_version # only do EDID on >= VBE2.0 + jl no_edid + pushw %es # save ES xorw %di, %di # Report Capability pushw %di @@ -1987,6 +2000,7 @@ do_restore: .byte 0 # Screen contents al svga_prefix: .byte VIDEO_FIRST_BIOS>>8 # Default prefix for BIOS modes graphic_mode: .byte 0 # Graphic mode with a linear frame buffer dac_size: .byte 6 # DAC bit depth +vbe_version: .word 0 # VBE bios version # Status messages keymsg: .ascii "Press <RETURN> to see video modes available, " Index: linux-2.6.20-mm1/arch/x86_64/boot/video.S =================================================================== RCS file: /home/cvsroot/linux-2.6.20-mm1/arch/x86_64/boot/video.S,v retrieving revision 1.1.1.1 diff -u -p -B -r1.1.1.1 video.S --- linux-2.6.20-mm1/arch/x86_64/boot/video.S 15 Feb 2007 17:36:18 -0000 1.1.1.1 +++ linux-2.6.20-mm1/arch/x86_64/boot/video.S 17 Feb 2007 08:29:11 -0000 @@ -571,6 +571,16 @@ setr1: lodsw jmp _m_s check_vesa: +#ifdef CONFIG_FIRMWARE_EDID + leaw modelist+1024, %di + movw $0x4f00, %ax + int $0x10 + cmpw $0x004f, %ax + jnz setbad + + movw 4(%di), %ax + movw %ax, vbe_version +#endif leaw modelist+1024, %di subb $VIDEO_FIRST_VESA>>8, %bh movw %bx, %cx # Get mode information structure @@ -1945,6 +1955,9 @@ store_edid: rep stosl + cmpw $0x0200, vbe_version # only do EDID on >= VBE2.0 + jl no_edid + pushw %es # save ES xorw %di, %di # Report Capability pushw %di @@ -1987,6 +2000,7 @@ do_restore: .byte 0 # Screen contents al svga_prefix: .byte VIDEO_FIRST_BIOS>>8 # Default prefix for BIOS modes graphic_mode: .byte 0 # Graphic mode with a linear frame buffer dac_size: .byte 6 # DAC bit depth +vbe_version: .word 0 # VBE bios version # Status messages keymsg: .ascii "Press <RETURN> to see video modes available, " - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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