From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262079AbUL1F0h (ORCPT ); Tue, 28 Dec 2004 00:26:37 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262080AbUL1FZv (ORCPT ); Tue, 28 Dec 2004 00:25:51 -0500 Received: from b.mail.sonic.net ([64.142.19.5]:7051 "EHLO b.mail.sonic.net") by vger.kernel.org with ESMTP id S262079AbUL1FYo (ORCPT ); Tue, 28 Dec 2004 00:24:44 -0500 Date: Mon, 27 Dec 2004 21:29:15 -0800 From: Jim McCloskey To: linux-kernel@vger.kernel.org Subject: 2.6.10 solves mtrr problem Message-ID: <20041228052915.GA9330@lapdog> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Operating-System: Debian GNU/Linux/2.6.10 (i686) User-Agent: Mutt/1.5.6+20040907i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org 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 ======================================================================