I can confirm this bug here too and found a temporarly workaround. Ivy-Bridge i5-3570K on Intel DH77EB MoBo (H77 chipset), latest BIOS EB0089.BIO.
These freezes happend most of the time when hitting a link in Iceweasel. They are so severe that even the MoBo reset button does not respond immediately, I had to hit it several times. Additionally when PC stalls, monitor continues to display the frozen desktop (via displayport) and power consumption rises from idle 38 watts to constant 86 watts - verry dangerous if also fan regulation fails. Upon next boot I get "orphaned inodes" - very much the same as Per Foreby describes. System here is Wheezy-amd64 with - kernel 3.2.23-1 - xserver-xorg-video-intel 2:2.19.0-5 Now I'll give the history what I did try with which result. Sorry if it's not scientific, but probably helps to pin down the root cause. It started when I was examining my logs and discovered the messages: [drm] MTRR allocation failed. Graphics performance may suffer. Checking mtrr's showed: cat /proc/mtrr reg00: base=0x000000000 ( 0MB), size= 8192MB, count=1: write-back reg01: base=0x200000000 ( 8192MB), size= 512MB, count=1: write-back reg02: base=0x0e0000000 ( 3584MB), size= 512MB, count=1: uncachable reg03: base=0x0dc000000 ( 3520MB), size= 64MB, count=1: uncachable reg04: base=0x0db800000 ( 3512MB), size= 8MB, count=1: uncachable reg05: base=0x21f800000 ( 8696MB), size= 8MB, count=1: uncachable reg06: base=0x21f600000 ( 8694MB), size= 2MB, count=1: uncachable So I decided to boot with kernel parameter enable_mtrr_cleanup which seemed to solve the problem: reg00: base=0x000000000 ( 0MB), size= 2048MB, count=1: write-back reg01: base=0x080000000 ( 2048MB), size= 1024MB, count=1: write-back reg02: base=0x0c0000000 ( 3072MB), size= 512MB, count=1: write-back reg03: base=0x0db800000 ( 3512MB), size= 8MB, count=1: uncachable reg04: base=0x0dc000000 ( 3520MB), size= 64MB, count=1: uncachable reg05: base=0x100000000 ( 4096MB), size= 4096MB, count=1: write-back reg06: base=0x200000000 ( 8192MB), size= 512MB, count=1: write-back reg07: base=0x21f600000 ( 8694MB), size= 2MB, count=1: uncachable reg08: base=0x21f800000 ( 8696MB), size= 8MB, count=1: uncachable reg09: base=0x0e0000000 ( 3584MB), size= 256MB, count=1: write-combining At least since then (don't know whether before as well) the freezes/crashes were observed, sometimes more than once a day. Did try a lot to find the root cause and finally found following workaround: Default setting in the BIOS of the DH77EB for video agp-aperture is "max" (values of 64, 128, 256 and 512MB are offered as options). I played around with different BIOS settings and observed that these settings are not respected by the i915 module. Dmesg always reports 256MB for the aperture: dmesg | grep agp Linux agpgart interface v0.103 agpgart-intel 0000:00:00.0: Intel Ivybridge Chipset agpgart-intel 0000:00:00.0: detected gtt size: 2097152K total, 262144K mappable agpgart-intel 0000:00:00.0: detected 65536K stolen memory agpgart-intel 0000:00:00.0: AGP aperture is 256M @ 0xe0000000 So I decided to set the BIOS AGP-aperture to 256MB as well and removed the kernel parameter 'enable_mtrr_cleanup'. I now get for the mtrr's: reg00: base=0x000000000 ( 0MB), size= 8192MB, count=1: write-back reg01: base=0x200000000 ( 8192MB), size= 512MB, count=1: write-back reg02: base=0x0e0000000 ( 3584MB), size= 512MB, count=1: uncachable reg03: base=0x0dc000000 ( 3520MB), size= 64MB, count=1: uncachable reg04: base=0x0db800000 ( 3512MB), size= 8MB, count=1: uncachable reg05: base=0x21f800000 ( 8696MB), size= 8MB, count=1: uncachable reg06: base=0x21f600000 ( 8694MB), size= 2MB, count=1: uncachable still suffering graphics performance and "mtrr missmatch" according to dmesg: mtrr: type mismatch for e0000000,10000000 old: write-back new: write-combining [drm] MTRR allocation failed. Graphics performance may suffer. But since then I have never obseved any cras/freeze for days now. If more information is required, please let me know (logs did never contain any information related to the crashes). My suspicion for the cause is some memory or communication missmatch between BIOS-setting, mtrr's and agp-aperture. -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
