[Bug 16468] New: 2.6.12 and above create 100% CPU with xorg on iMac

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http://bugzilla.ubuntu.com/show_bug.cgi?id=16468
Ubuntu | kernel-package

           Summary: 2.6.12 and above create 100% CPU with xorg on iMac
           Product: Ubuntu
           Version: unspecified
          Platform: powerpc
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: kernel-package
        AssignedTo: ben.collins at ubuntu.com
        ReportedBy: petrvz at gmx.net
         QAContact: kubuntu-bugs at lists.ubuntu.com


After ugrading the kernel on iMac 600Mhz running Breezy Kubuntu to 2.6.12-xxx I
can no longer login with KDM. It takes a long time before the screen gets drawn
and the login boxes appear. When they do, the keyboard is unresponsive. This
happens with all the 2.6.12 builds from Ubuntu that I've tried, and also with
the 2.6.13 official Debian kernel from www.ppckernel.org that I tested. I can
login with ssh from another box and top shows that xorg is eating 99% CPU
resources. Not sure if this is KDE-specific since I haven't tried loading Gnome
on this iMac. Never any problems with 2.6.11 and below.

pvz at imac:~$ cat /proc/cpuinfo
processor       : 0
cpu             : 745/755
temperature     : 19-21 C (uncalibrated)
clock           : 600MHz
revision        : 50.20 (pvr 0008 3214)
bogomips        : 1196.03
machine         : PowerMac4,1
motherboard     : PowerMac4,1 MacRISC2 MacRISC Power Macintosh
detected as     : 256 (iMac "Flower Power")
pmac flags      : 00000010
L2 cache        : 256K unified
memory          : 512MB
pmac-generation : NewWorld

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