Messages in this thread |  | | | Date | Mon, 27 Dec 2004 21:29:15 -0800 | | From | Jim McCloskey <> | | Subject | 2.6.10 solves mtrr problem |
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Probably well known already to the knowledgeable, but I just wanted to report that 2.6.10 fixes a problem that I have been puzzled by since about 2.6.7.
The problem was that mtrr ranges were not set appropriately for the graphics card on my laptop, which is a:
---------------------------------------------------------------------- 0000:01:00.0 VGA compatible controller: ATI Technologies Inc Radeon Mobility M6 LY (prog-if 00 [VGA]) Subsystem: Mitac: Unknown device 8170 Flags: bus master, stepping, 66MHz, medium devsel, latency 64, IRQ 11 Memory at 90000000 (32-bit, prefetchable) [size=128M] I/O ports at c000 [size=256] Memory at e0000000 (32-bit, non-prefetchable) [size=64K] Capabilities: [58] AGP version 2.0 Capabilities: [50] Power Management version 2 ---------------------------------------------------------------------- The problem was indicated in kern.log for 2.6.9:
---------------------------------------------------------------------- Dec 14 10:31:19 lapdog kernel: mtrr: 0x90000000,0x1000000 overlaps existing 0x90000000,0x200000 ---------------------------------------------------------------------- which resulted in turn in the following, when the X server was started:
---------------------------------------------------------------------- (--) RADEON(0): Linear framebuffer at 0x90000000 (--) RADEON(0): VideoRAM: 16384 kByte (64 bit DDR SDRAM) (II) RADEON(0): AGP card detected ..... (WW) RADEON(0): Failed to set up write-combining range (0x90000000,0x1000000) ---------------------------------------------------------------------- This problem has disappeared in 2.6.10. /proc/mtrr:
---------------------------------------------------------------------- reg00: base=0x00000000 ( 0MB), size= 512MB: write-back, count=1 reg01: base=0x90000000 (2304MB), size= 16MB: write-combining, count=3 reg02: base=0xa0000000 (2560MB), size= 64MB: write-combining, count=1 ---------------------------------------------------------------------- For previous 2.6 kernels, I had to run a hand-written script to achieve this result.
Thank you,
Jim
---------------------------------------------------------------------- cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 15 model : 2 model name : Intel(R) Pentium(R) 4 CPU 1.60GHz stepping : 4 cpu MHz : 1600.489 cache size : 512 KB fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 2 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm bogomips : 3153.92 ====================================================================== - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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