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[Bug 1544798] Re: high load with 4.4 and 4.5 kernels for Intel Mobile processors

 

CPU details
$ cat /proc/cpuinfo 
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 61
model name	: Intel(R) Core(TM) M-5Y71 CPU @ 1.20GHz
stepping	: 4
microcode	: 0x1d
cpu MHz		: 1198.804
cache size	: 4096 KB
physical id	: 0
siblings	: 4
core id		: 0
cpu cores	: 2
apicid		: 0
initial apicid	: 0
fpu		: yes
fpu_exception	: yes
cpuid level	: 20
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 syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch epb intel_pt tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm rdseed adx smap xsaveopt dtherm ida arat pln pts
bugs		:
bogomips	: 2793.50
clflush size	: 64
cache_alignment	: 64
address sizes	: 39 bits physical, 48 bits virtual
power management:

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https://bugs.launchpad.net/bugs/1544798

Title:
  high load with 4.4 and 4.5 kernels for Intel Mobile processors

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Running the mainline kernel builds, I'm seeing high load averages for
  my Intel Mobile processor. When I revert back to the 4.2 kernel, the
  load goes back down. (Reason for using the 4.5 kernel is because the
  Intel i915 Graphics driver crashes/freezes).

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References