On an HP d530, I experience this bug. Even after using ht=on on kernel
command line, HT is not enabled on latest 8.10 kernel 2.6.28-15-generic.
j...@john-desktop:~$ uname -r
2.6.28-15-generic
j...@john-desktop:~$ cat /proc/cpuinfo | grep 'ht'
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe up pebs bts cid xtpr
j...@john-desktop:~$ cat /etc/issue
Ubuntu 9.04 \n \l
j...@john-desktop:~$ dmesg | grep -i 'hyper'
[ 0.004280] CPU: Hyper-Threading is disabled
j...@john-desktop:~$ dmesg | grep -i 'ht'
[ 0.000000] Kernel command line:
root=UUID=539bf5e6-9967-4e75-927a-ba9c3e2aa958 ro ht=on xforcevesa quiet splash
[ 0.484001] Brought up 1 CPUs
j...@john-desktop:~$ cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 15
model : 2
model name : Intel(R) Pentium(R) 4 CPU 2.66GHz
stepping : 9
cpu MHz : 2659.980
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 apic sep mtrr pge mca cmov
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe up pebs bts cid xtpr
bogomips : 5319.96
clflush size : 64
power management:
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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Can't enable Hyper-Threading
https://bugs.launchpad.net/bugs/277085
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