Bug#442771: linux-image-2.6.18-5-xen-vserver-686: xorg drivers (i810, nv, vesa, nvidia) fail to function under xen

[supaplex <debian@foss.daxal.com>]

Package: linux-image-2.6.18-5-xen-vserver-686
Version: 2.6.18.dfsg.1-13etch2
Severity: normal

I have two screens. screen0 usually uses i810, and screen1 uses nvidia
or nv.  For this testing I've also attempted to use vesa in attempts of
any usability of xorg on dom0. All tested senarios do not function under
xen, but work well under linux-image-2.6.18-4-686-bigmem.  My attempts
also include using screen0 only.

$ lspci -nn | grep -i vga
00:02.0 VGA compatible controller [0300]: Intel Corporation
82845G/GL[Brookdale-G]/GE Chipset Integrated Graphics Device [8086:2562]
(rev 03)
01:0b.0 VGA compatible controller [0300]: nVidia Corporation NV17
[GeForce4 MX 420] [10de:0172] (rev a3)

On a xen kernel, xorg+i810 provide these interesting logs in Xorg.0.log:
(II) Configured Mouse: ps2EnableDataReporting: succeeded
Error in I830WaitLpRing(), now is 258708253, start is 258706252
pgetbl_ctl: 0x5ffe0001 pgetbl_err: 0x0
ipeir: 0 iphdr: 2000011
LP ring tail: d40 head: d3c len: 1f001 start 0
eir: 0 esr: 0 emr: ff7b
instdone: ff41 instpm: 0
memmode: 0 instps: 22
hwstam: ffff ier: 0 imr: ffff iir: 0
space: 131060 wanted 131064

Fatal server error:
lockup

Error in I830WaitLpRing(), now is 258710449, start is 258708265
pgetbl_ctl: 0x5ffe0001 pgetbl_err: 0x0
ipeir: 0 iphdr: 2000011
LP ring tail: d48 head: d3c len: 1f001 start 0
eir: 0 esr: 0 emr: ff7b
instdone: ff41 instpm: 0
memmode: 0 instps: 22
hwstam: ffff ier: 0 imr: ffff iir: 0
space: 131052 wanted 131064

FatalError re-entered, aborting
lockup


I have copious logs and other details I don't think need to clutter this
report.  I'll retain them if you need more information.

Thanks!

-- System Information:
Debian Release: 4.0
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: i386 (i686)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.18-5-xen-vserver-686
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)

Versions of packages linux-image-2.6.18-5-xen-vserver-686 depends on:
ii  initramfs-tools    0.85h                 tools for generating an initramfs
ii  linux-modules-2.6. 2.6.18.dfsg.1-13etch2 Linux 2.6.18 modules on i686

Versions of packages linux-image-2.6.18-5-xen-vserver-686 recommends:
ii  libc6-xen              2.3.6.ds1-13etch2 GNU C Library: Shared libraries [X

-- no debconf information