Distribution: Gentoo linux
Hardware Environment:Acer Aspire 1353LC, AMD Athlon XP-M 2400+
Software Environment:
Problem Description:

At boot i get this in the system logs on kernel 2.6.10-r1:

Mar 14 14:06:26 mbnote powernow: PowerNOW! Technology present. Can scale:
frequency and voltage.
Mar 14 14:06:26 mbnote powernow: No PST tables match this cpuid (0x7a0)
Mar 14 14:06:26 mbnote powernow: This is indicative of a broken BIOS.
Mar 14 14:06:26 mbnote powernow: Trying ACPI perflib
Mar 14 14:06:26 mbnote powernow: Minimum speed 353 MHz. Maximum speed 796 MHz

And the maximum frequency available is 796 MHz. It used to work. On kernel 2.6.7
i get:

Mar 14 11:43:47 mbnote powernow: PowerNOW! Technology present. Can scale:
frequency and voltage.
Mar 14 11:43:47 mbnote powernow: FSB: 132.745 MHz
Mar 14 11:43:47 mbnote powernow: Found PSB header at c00f06f0
Mar 14 11:43:47 mbnote powernow: Table version: 0x12
Mar 14 11:43:47 mbnote powernow: Flags: 0x0 (Mobile voltage regulator)
Mar 14 11:43:47 mbnote powernow: Settling Time: 100 microseconds.
Mar 14 11:43:47 mbnote powernow: Has 8 PST tables. (Only dumping ones relevant
tothis CPU).
Mar 14 11:43:47 mbnote powernow: PST:0 (@c00f0700)
Mar 14 11:43:47 mbnote powernow:  cpuid: 0x7a0  fsb: 133        maxFID: 0x15   
startvid: 0x8
Mar 14 11:43:47 mbnote powernow:    FID: 0xd (9.5x [1261MHz])   VID: 0xe (1.300V)
Mar 14 11:43:47 mbnote powernow:    FID: 0xe (10.0x [1327MHz])  VID: 0xd (1.350V)
Mar 14 11:43:47 mbnote powernow:    FID: 0xf (10.5x [1393MHz])  VID: 0xc (1.400V)
Mar 14 11:43:47 mbnote powernow:    FID: 0x0 (11.0x [1460MHz])  VID: 0xb (1.450V)
Mar 14 11:43:47 mbnote powernow:    FID: 0x1 (11.5x [1526MHz])  VID: 0xa (1.500V)
Mar 14 11:43:47 mbnote powernow:    FID: 0x2 (12.0x [1592MHz])  VID: 0x9 (1.550V)
Mar 14 11:43:47 mbnote powernow:    FID: 0x15 (13.5x [1792MHz]) VID: 0x8 (1.600V)
Mar 14 11:43:47 mbnote powernow: SGTC: 13333
Mar 14 11:43:47 mbnote powernow: Minimum speed 1261 MHz. Maximum speed 1792 MHz.

this is how /proc/cpuinfo looked before upgrade: 

processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 6
model           : 10
model name      : Mobile AMD Athlon(tm) XP 2400+
stepping        : 0
cpu MHz         : 1791.648
cache size      : 512 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca36 mmx fxsr
sse pni syscall mp mmxext 3dnowext 3dnow
bogomips        : 3538.94

Filed bug with bugs.gentoo.org at http://bugs.gentoo.org/show_bug.cgi?id=85213

Steps to reproduce: