mkrikis@yahoo.com
Hello,
Having just tried to launch a 32-bit x86 Xorg X server with an
x86_64 kernel, I was forced to spend a lot of time educating
myself about why this doesn't work.
The relevant kernel log lines are these:
Feb 4 15:17:30 kanna kernel: vbetool: vm86 mode not supported on 64 bit kernel
Feb 4 15:17:36 kanna kernel: Xorg: vm86 mode not supported on 64 bit kernel
Xorg.0.log file ends with the following:
(II) Loading sub module "int10"
(II) LoadModule: "int10"
(II) Reloading /usr/lib/xorg/modules/libint10.so
(II) I810(0): initializing int10
(WW) I810(0): Bad V_BIOS checksum
(II) I810(0): Primary V_BIOS segment is: 0xc000
(EE) I810(0): unknown type(0xffffffff)=0xff
(II) I810(0): EAX=0x00004f00, EBX=0x00000000, ECX=0x00000000, EDX=0x00000000
(II) I810(0): ESP=0x00000ffa, EBP=0x00000000, ESI=0x00000000, EDI=0x00002000
(II) I810(0): CS=0xc000, SS=0x0100, DS=0x0040, ES=0x0000, FS=0x0000, GS=0x0000
(II) I810(0): EIP=0x00000014, EFLAGS=0x00003200
(II) I810(0): code at 0x000c0014:
e9 a1 20 b7 40 00 e0 0a 30 30 49 42 4d 20 56 47
41 20 43 6f 6d 70 61 74 69 62 6c 65 20 42 49 4f
(II) stack at 0x00001ffa:
00 06 00 00 00 32
(II) I810(0): VESA BIOS not detected
(EE) I810(0): VBE initialization failed.
(II) UnloadModule: "i810"
(II) UnloadModule: "int10"
(II) UnloadModule: "vgahw"
(II) Unloading /usr/lib/xorg/modules/libvgahw.so
(II) UnloadModule: "vbe"
(II) UnloadModule: "int10"
(EE) Screen(s) found, but none have a usable configuration.
Fatal server error:
no screens found
As far as I understand now, this is caused by xserver-xorg using
the vm86 backend and not falling back on x86emu backend use, even
though allegedly it does so for other architectures. 64-bit
kernels, however, don't have the CONFIG_VM86; hence the failure.
If I've got it wrong and there is something I can put in my xorg.conf
to work around the problem, I'd be very happy to hear about it.
Otherwise, what are the chances of including a fallback option
(to x86emu) in future X server builds for the 32-bit x86 platform?
Or have I misunderstood completely the seriousness of the problem,
and are there any other ways of dealing with it?
Thanks very much for your time,
Martins Krikis
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