The problem is still there on my Acer 1830T, 4GB RAM with Quantal kernel
3.4.0-1-generic, x86_64
$ cat /proc/mtrr
reg00: base=0x000000000 ( 0MB), size= 2048MB, count=1: write-back
reg01: base=0x0ffe00000 ( 4094MB), size= 2MB, count=1: write-protect
reg02: base=0x080000000 ( 2048MB), size= 1024MB, count=1: write-back
reg03: base=0x0b8000000 ( 2944MB), size= 128MB, count=1: uncachable
reg04: base=0x0b4000000 ( 2880MB), size= 64MB, count=1: uncachable
reg05: base=0x0b3800000 ( 2872MB), size= 8MB, count=1: uncachable
reg06: base=0x100000000 ( 4096MB), size= 1024MB, count=1: write-back
reg07: base=0x138000000 ( 4992MB), size= 128MB, count=1: uncachable
$ cat /proc/iomem
00000000-0000ffff : reserved
00010000-0009cfff : System RAM
0009d000-0009ffff : reserved
000a0000-000bffff : PCI Bus 0000:00
000c0000-000c7fff : Video ROM
000e0000-000fffff : reserved
000f0000-000fffff : System ROM
00100000-b363efff : System RAM
01000000-01689262 : Kernel code
01689263-01cdfa3f : Kernel data
01dcc000-01f2ffff : Kernel bss
b363f000-b36befff : reserved
b36bf000-b37befff : ACPI Non-volatile Storage
b37bf000-b37fefff : ACPI Tables
b37ff000-b37fffff : System RAM
b3800000-bfffffff : reserved
c0000000-feafffff : PCI Bus 0000:00
c0000000-cfffffff : 0000:00:02.0
d0000000-d03fffff : 0000:00:02.0
d0400000-d13fffff : PCI Bus 0000:01
d1400000-d23fffff : PCI Bus 0000:02
d2400000-d33fffff : PCI Bus 0000:02
d2400000-d2403fff : 0000:02:00.0
d2400000-d2403fff : 0000:02:00.0
d3400000-d43fffff : PCI Bus 0000:01
d3400000-d343ffff : 0000:01:00.0
d3400000-d343ffff : atl1c
d4400000-d4403fff : 0000:00:1b.0
d4400000-d4403fff : ICH HD audio
d4404000-d4404fff : 0000:00:1f.6
d4404000-d4404fff : ips thermal sensor
d4405000-d44057ff : 0000:00:1f.2
d4405000-d44057ff : ahci
d4405800-d4405bff : 0000:00:1d.0
d4405800-d4405bff : ehci_hcd
d4405c00-d4405fff : 0000:00:1a.0
d4405c00-d4405fff : ehci_hcd
d4406000-d44060ff : 0000:00:1f.3
d4406100-d440610f : 0000:00:16.0
d4406100-d440610f : mei
d4407000-d4407fff : Intel Flush Page
d4500000-d4500fff : pnp 00:09
e0000000-efffffff : PCI MMCONFIG 0000 [bus 00-ff]
e0000000-efffffff : reserved
e0000000-efffffff : pnp 00:09
feb00000-feb03fff : reserved
fec00000-fec00fff : reserved
fec00000-fec003ff : IOAPIC 0
fed00000-fed003ff : HPET 0
fed10000-fed13fff : reserved
fed10000-fed13fff : pnp 00:09
fed18000-fed19fff : reserved
fed18000-fed18fff : pnp 00:09
fed19000-fed19fff : pnp 00:09
fed1b000-fed1ffff : reserved
fed1c000-fed1ffff : pnp 00:09
fed20000-fed3ffff : pnp 00:09
fed45000-fed8ffff : pnp 00:09
fee00000-fee00fff : Local APIC
fee00000-fee00fff : reserved
ffe00000-ffffffff : reserved
100000000-137ffffff : System RAM
selected dmesgs :
[ 0.000000] MTRR default type: uncachable
[ 0.000000] MTRR fixed ranges enabled:
[ 0.000000] 00000-9FFFF write-back
[ 0.000000] A0000-BFFFF uncachable
[ 0.000000] C0000-EFFFF write-through
[ 0.000000] F0000-FFFFF write-combining
[ 0.000000] MTRR variable ranges enabled:
[ 0.000000] 0 base 000000000 mask F80000000 write-back
[ 0.000000] 1 base 0FFE00000 mask FFFE00000 write-protect
[ 0.000000] 2 base 080000000 mask FC0000000 write-back
[ 0.000000] 3 base 0B8000000 mask FF8000000 uncachable
[ 0.000000] 4 base 0B4000000 mask FFC000000 uncachable
[ 0.000000] 5 base 0B3800000 mask FFF800000 uncachable
[ 0.000000] 6 base 100000000 mask FC0000000 write-back
[ 0.000000] 7 base 138000000 mask FF8000000 uncachable
...
[ 13.932998] intel ips 0000:00:1f.6: CPU TDP doesn't match expected value
(found 11, expected 14)
[ 13.933095] intel ips 0000:00:1f.6: failed to get i915 symbols, graphics
turbo disabled until i915 loads
[ 13.935874] intel ips 0000:00:1f.6: IPS driver initialized, MCP temp limit 90
[ 13.945921] [drm] Initialized drm 1.1.0 20060810
[ 13.986234] microcode: CPU1 sig=0x20655, pf=0x10, revision=0x2
[ 13.988326] microcode: CPU2 sig=0x20655, pf=0x10, revision=0x2
[ 13.990248] microcode: CPU3 sig=0x20655, pf=0x10, revision=0x2
[ 13.992176] microcode: Microcode Update Driver: v2.00
<tig...@aivazian.fsnet.co.uk>, Peter Oruba
[ 14.272825] Linux video capture interface: v2.00
[ 14.373755] cfg80211: Calling CRDA to update world regulatory domain
[ 14.410581] uvcvideo: Found UVC 1.00 device 1.3M WebCam (064e:a219)
[ 14.420398] input: 1.3M WebCam as
/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.5/2-1.5:1.0/input/input4
[ 14.420548] usbcore: registered new interface driver uvcvideo
[ 14.420552] USB Video Class driver (1.1.1)
[ 14.685467] i915 0000:00:02.0: setting latency timer to 64
[ 14.750759] psmouse serio1: synaptics: Touchpad model: 1, fw: 7.4, id:
0x1c0b1, caps: 0xd04773/0xa40000/0xa0400
[ 14.765600] mtrr: no more MTRRs available
[ 14.765605] [drm] MTRR allocation failed. Graphics performance may suffer.
[ 14.766130] i915 0000:00:02.0: irq 42 for MSI/MSI-X
[ 14.766147] [drm] Supports vblank timestamp caching Rev 1 (10.10.2010).
[ 14.766150] [drm] Driver supports precise vblank timestamp query.
[ 14.766203] vgaarb: device changed decodes:
PCI:0000:00:02.0,olddecodes=io+mem,decodes=io+mem:owns=io+mem
[ 14.807838] input: SynPS/2 Synaptics TouchPad as
/devices/platform/i8042/serio1/input/input5
[ 15.330147] fbcon: inteldrmfb (fb0) is primary device
[ 15.605097] b43: Unknown parameter `blacklist'
[ 15.656128] Console: switching to colour frame buffer device 170x48
[ 15.661321] fb0: inteldrmfb frame buffer device
[ 15.661324] drm: registered panic notifier
[ 15.682785] acpi device:02: registered as cooling_device4
[ 15.683208] input: Video Bus as
/devices/LNXSYSTM:00/device:00/PNP0A08:00/LNXVIDEO:00/input/input6
[ 15.683313] ACPI: Video Device [GFX0] (multi-head: yes rom: no post: no)
[ 15.683448] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0
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https://bugs.launchpad.net/bugs/709677
Title:
[drm] MTRR allocation failed. Graphics performance may suffer.
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