Public bug reported:
I have run Ubuntu 8.10 on my Packard Bell EasyNote MH-35 laptop without
problems. After upgrading to Ubuntu version 9.04, lap-top is slow and uses only
one core. The processor is Intel Core Duo T8100. I have to use noapic nolapic
boot options to get Ubuntu booting (also in the 8.10 version). I have tried to
disable the USB mouse and keyboard support in BIOS (this was suggested as a
solution on another lap-top) but in this case the system refuses to boot.
Below some more info.
# cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 23
model name : Intel(R) Core(TM)2 Duo CPU T8100 @ 2.10GHz
stepping : 6
cpu MHz : 1200.000
cache size : 3072 KB
physical id : 0
siblings : 1
core id : 0
cpu cores : 1
apicid : 0
initial apicid : 0
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 10
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 pbe nx lm constant_tsc
arch_perfmon pebs bts pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr
pdcm sse4_1 lahf_lm ida tpr_shadow vnmi flexpriority
bogomips : 4200.11
clflush size : 64
power management:
# dmesg | grep -i cpu
[ 0.000000] Initializing cgroup subsys cpuset
[ 0.000000] Initializing cgroup subsys cpu
[ 0.000000] KERNEL supported cpus:
[ 0.000000] Transmeta TransmetaCPU
[ 0.000000] ACPI: SSDT B7D9924D, 025F (r1 PmRef Cpu0Tst 3000 INTL
20050228)
[ 0.000000] ACPI: SSDT B7D991A7, 00A6 (r1 PmRef Cpu7Tst 3000 INTL
20050228)
[ 0.000000] ACPI: SSDT B7D99101, 00A6 (r1 PmRef Cpu6Tst 3000 INTL
20050228)
[ 0.000000] ACPI: SSDT B7D9905B, 00A6 (r1 PmRef Cpu5Tst 3000 INTL
20050228)
[ 0.000000] ACPI: SSDT B7D98FB5, 00A6 (r1 PmRef Cpu4Tst 3000 INTL
20050228)
[ 0.000000] ACPI: SSDT B7D98F0F, 00A6 (r1 PmRef Cpu3Tst 3000 INTL
20050228)
[ 0.000000] ACPI: SSDT B7D98E69, 00A6 (r1 PmRef Cpu2Tst 3000 INTL
20050228)
[ 0.000000] ACPI: SSDT B7D98DC3, 00A6 (r1 PmRef Cpu1Tst 3000 INTL
20050228)
[ 0.000000] ACPI: SSDT B7D979A9, 141A (r1 PmRef CpuPm 3000 INTL
20050228)
[ 0.000000] Processor #0 (Bootup-CPU)
[ 0.000000] SMP: Allowing 2 CPUs, 0 hotplug CPUs
[ 0.000000] PERCPU: Allocating 45056 bytes of per cpu data
[ 0.000000] NR_CPUS: 64, nr_cpu_ids: 2, nr_node_ids 1
[ 0.000000] Initializing CPU#0
[ 0.004000] SLUB: Genslabs=12, HWalign=64, Order=0-3, MinObjects=0, CPUs=2,
Nodes=1
[ 0.004000] HPET: 3 timers in total, 0 timers will be used for per-cpu timer
[ 0.004000] Initializing cgroup subsys cpuacct
[ 0.004000] CPU: L1 I cache: 32K, L1 D cache: 32K
[ 0.004000] CPU: L2 cache: 3072K
[ 0.004000] CPU: Physical Processor ID: 0
[ 0.004000] CPU: Processor Core ID: 0
[ 0.532470] Brought up 1 CPUs
[ 0.532488] CPU0 attaching NULL sched-domain.
[ 0.568016] Switched to high resolution mode on CPU 0
[ 1.643118] cpufreq: No nForce2 chipset.
[ 1.664851] ACPI: SSDT B7D99D67, 0261 (r1 PmRef Cpu0Ist 3000 INTL
20050228)
[ 1.668409] ACPI: SSDT B7D994AC, 0518 (r1 PmRef Cpu0Cst 3001 INTL
20050228)
[ 1.671438] ACPI: CPU0 (power states: C1[C1] C2[C2] C3[C3])
[ 1.671480] processor ACPI_CPU:00: registered as cooling_device1
[ 1.671488] ACPI: Processor [CPU0] (supports 8 throttling states)
[ 2.796475] cpuidle: using governor ladder
[ 2.796566] cpuidle: using governor menu
[ 43.694069] CPU0 attaching NULL sched-domain.
[ 43.694140] CPU0 attaching NULL sched-domain.
** Affects: ubuntu
Importance: Undecided
Status: New
--
After upgrade to version 9.04, Ubuntu uses only one processor.
https://bugs.launchpad.net/bugs/371210
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