[Bug 314928] Re: [i915GM] MTRR entry missing since jaunty - is this intentional?

[drag0njoe]

Thanks, fixed video playing/youtube problems on my Toshiba Tecra A8 (i945 GM).
Seems this problem affects many Intel GPU...

Detailed:
#lspci -vvnn
00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller [8086:27a2] (rev 03)
	Subsystem: Toshiba America Info Systems Device [1179:0005]
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 16
	Region 0: Memory at ffd80000 (32-bit, non-prefetchable) [size=512K]
	Region 1: I/O ports at cff8 [size=8]
	Region 2: Memory at e0000000 (32-bit, prefetchable) [size=256M]
	Region 3: Memory at ffd40000 (32-bit, non-prefetchable) [size=256K]
	Capabilities: [90] Message Signalled Interrupts: Mask- 64bit- Queue=0/0 Enable-
		Address: 00000000  Data: 0000
	Capabilities: [d0] Power Management version 2
		Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 PME-Enable- DSel=0 DScale=0 PME-
	Kernel modules: intelfb

root at drag0njoe-laptop:~# cat /proc/mtrr
reg00: base=0x0feda0000 ( 4077MB), size=  128KB, count=1: write-back
reg01: base=0x07f800000 ( 2040MB), size=    8MB, count=1: uncachable
reg02: base=0x0fff00000 ( 4095MB), size=    1MB, count=1: write-protect
reg03: base=0x000000000 (    0MB), size= 2048MB, count=1: write-back
root at drag0njoe-laptop:~# echo "base=0xe0000000 size=0x10000000 type=write-combining" > /proc/mtrr
root at drag0njoe-laptop:~# cat /proc/mtrr
reg00: base=0x0feda0000 ( 4077MB), size=  128KB, count=1: write-back
reg01: base=0x07f800000 ( 2040MB), size=    8MB, count=1: uncachable
reg02: base=0x0fff00000 ( 4095MB), size=    1MB, count=1: write-protect
reg03: base=0x000000000 (    0MB), size= 2048MB, count=1: write-back
reg04: base=0x0e0000000 ( 3584MB), size=  256MB, count=1: write-combining

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[i915GM] MTRR entry missing since jaunty - is this intentional?
https://bugs.launchpad.net/bugs/314928
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