Package: xserver-xorg-core Severity: serious On Mon, Feb 5, 2007 at 01:26:22 +0200, Martins Krikis wrote:
> 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 > Indeed, this is a regression from the transition to modular X, the code implementing a fallback from vm86 to x86emu isn't getting built. In hw/xfree86/os-support/linux/int10/linux.c, this code is dependent on the DoSubModules macro, which is never set. I'm filing this as a serious bug against the Xorg server, because Debian ships 64bit kernels on i386 and X not working with this combination is IMO a very bad regression. Cheers, Julien -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
