Comment 1 for bug 82662

detail from /var/log/Xorg.0.log, it could be useful too:

(II) PCI-to-ISA bridge:
(II) Bus -1: bridge is at (0:31:0), (0,-1,-1), BCTRL: 0x0008 (VGA_EN is set)
(--) PCI:*(0:1:0) Intel Corporation 82810 DC-100 CGC [Chipset Graphics Controlle
r] rev 2, Mem @ 0xf8000000/26, 0xff000000/19
(II) Addressable bus resource ranges are
        [0] -1 0 0x00000000 - 0xffffffff (0x0) MX[B]
        [1] -1 0 0x00000000 - 0x0000ffff (0x10000) IX[B]
(II) OS-reported resource ranges:
        [0] -1 0 0x00100000 - 0x3fffffff (0x3ff00000) MX[B]E(B)
        [1] -1 0 0x000f0000 - 0x000fffff (0x10000) MX[B]
        [2] -1 0 0x000c0000 - 0x000effff (0x30000) MX[B]
        [3] -1 0 0x00000000 - 0x0009ffff (0xa0000) MX[B]
        [4] -1 0 0x0000ffff - 0x0000ffff (0x1) IX[B]
        [5] -1 0 0x00000000 - 0x000000ff (0x100) IX[B]
(II) Active PCI resource ranges:
        [0] -1 0 0xfdfff400 - 0xfdfff47f (0x80) MX[B]
        [1] -1 0 0xfdfff800 - 0xfdfff87f (0x80) MX[B]
        [2] -1 0 0xfdfffc00 - 0xfdfffc7f (0x80) MX[B]
        [3] -1 0 0xff000000 - 0xff07ffff (0x80000) MX[B](B)
        [4] -1 0 0xf8000000 - 0xfbffffff (0x4000000) MX[B](B)
        [5] -1 0 0x0000e880 - 0x0000e8ff (0x80) IX[B]
        [6] -1 0 0x0000ec00 - 0x0000ec7f (0x80) IX[B]
        [7] -1 0 0x0000ec80 - 0x0000ecff (0x80) IX[B]
        [8] -1 0 0x0000dcd0 - 0x0000dcdf (0x10) IX[B]
        [9] -1 0 0x0000ff80 - 0x0000ff9f (0x20) IX[B]
        [10] -1 0 0x0000ffa0 - 0x0000ffaf (0x10) IX[B]
(II) Active PCI resource ranges after removing overlaps:
        [0] -1 0 0xfdfff400 - 0xfdfff47f (0x80) MX[B]
        [1] -1 0 0xfdfff800 - 0xfdfff87f (0x80) MX[B]
        [2] -1 0 0xfdfffc00 - 0xfdfffc7f (0x80) MX[B]
        [3] -1 0 0xff000000 - 0xff07ffff (0x80000) MX[B](B)
        [4] -1 0 0xf8000000 - 0xfbffffff (0x4000000) MX[B](B)
        [5] -1 0 0x0000e880 - 0x0000e8ff (0x80) IX[B]
        [6] -1 0 0x0000ec00 - 0x0000ec7f (0x80) IX[B]
        [7] -1 0 0x0000ec80 - 0x0000ecff (0x80) IX[B]
        [8] -1 0 0x0000dcd0 - 0x0000dcdf (0x10) IX[B]
        [9] -1 0 0x0000ff80 - 0x0000ff9f (0x20) IX[B]
        [10] -1 0 0x0000ffa0 - 0x0000ffaf (0x10) IX[B]
(II) OS-reported resource ranges after removing overlaps with PCI:
        [0] -1 0 0x00100000 - 0x3fffffff (0x3ff00000) MX[B]E(B)
        [1] -1 0 0x000f0000 - 0x000fffff (0x10000) MX[B]
        [2] -1 0 0x000c0000 - 0x000effff (0x30000) MX[B]
        [3] -1 0 0x00000000 - 0x0009ffff (0xa0000) MX[B]
        [4] -1 0 0x0000ffff - 0x0000ffff (0x1) IX[B]
        [5] -1 0 0x00000000 - 0x000000ff (0x100) IX[B]
(II) All system resource ranges:
        [0] -1 0 0x00100000 - 0x3fffffff (0x3ff00000) MX[B]E(B)
        [1] -1 0 0x000f0000 - 0x000fffff (0x10000) MX[B]
        [2] -1 0 0x000c0000 - 0x000effff (0x30000) MX[B]
        [3] -1 0 0x00000000 - 0x0009ffff (0xa0000) MX[B]
        [4] -1 0 0xfdfff400 - 0xfdfff47f (0x80) MX[B]
        [5] -1 0 0xfdfff800 - 0xfdfff87f (0x80) MX[B]
        [6] -1 0 0xfdfffc00 - 0xfdfffc7f (0x80) MX[B]
        [7] -1 0 0xff000000 - 0xff07ffff (0x80000) MX[B](B)
        [8] -1 0 0xf8000000 - 0xfbffffff (0x4000000) MX[B](B)
        [9] -1 0 0x0000ffff - 0x0000ffff (0x1) IX[B]
        [10] -1 0 0x00000000 - 0x000000ff (0x100) IX[B]
        [11] -1 0 0x0000e880 - 0x0000e8ff (0x80) IX[B]
        [12] -1 0 0x0000ec00 - 0x0000ec7f (0x80) IX[B]
        [13] -1 0 0x0000ec80 - 0x0000ecff (0x80) IX[B]
        [14] -1 0 0x0000dcd0 - 0x0000dcdf (0x10) IX[B]
        [15] -1 0 0x0000ff80 - 0x0000ff9f (0x20) IX[B]
        [16] -1 0 0x0000ffa0 - 0x0000ffaf (0x10) IX[B]
(II) LoadModule: "i2c"