Same problem on Asus UX301LA running Ubuntu 15.10 and kernel 4.3: [ 0.000000] microcode: CPU0 microcode updated early to revision 0x1c, date = 2014-07-03 [ 0.000000] Initializing cgroup subsys cpuset [ 0.000000] Initializing cgroup subsys cpu [ 0.000000] Initializing cgroup subsys cpuacct [ 0.000000] Linux version 4.3.0-040300-generic (kernel@gomeisa) (gcc version 5.2.1 20151010 (Ubuntu 5.2.1-22ubuntu2) ) #201511020949 SMP Mon Nov 2 14:50:44 UTC 2015 [ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-4.3.0-040300-generic root=UUID=396104e2-854b-48fd-b67e-344866003694 ro quiet splash i915.powersave=1 i915.semaphores=1 i915.i915_enable_rc6=1 i915.i915_enable_fbc=1 drm.vblankoffdelay=1 vt.handoff=7 [ 0.000000] KERNEL supported cpus: [ 0.000000] Intel GenuineIntel [ 0.000000] AMD AuthenticAMD [ 0.000000] Centaur CentaurHauls [ 0.000000] x86/fpu: xstate_offset[2]: 0240, xstate_sizes[2]: 0100 [ 0.000000] x86/fpu: Supporting XSAVE feature 0x01: 'x87 floating point registers' [ 0.000000] x86/fpu: Supporting XSAVE feature 0x02: 'SSE registers' [ 0.000000] x86/fpu: Supporting XSAVE feature 0x04: 'AVX registers' [ 0.000000] x86/fpu: Enabled xstate features 0x7, context size is 0x340 bytes, using 'standard' format. [ 0.000000] x86/fpu: Using 'eager' FPU context switches. [ 0.000000] e820: BIOS-provided physical RAM map: [ 0.000000] BIOS-e820: [mem 0x0000000000000000-0x0000000000057fff] usable [ 0.000000] BIOS-e820: [mem 0x0000000000058000-0x0000000000058fff] reserved [ 0.000000] BIOS-e820: [mem 0x0000000000059000-0x000000000009dfff] usable [ 0.000000] BIOS-e820: [mem 0x000000000009e000-0x000000000009ffff] reserved [ 0.000000] BIOS-e820: [mem 0x0000000000100000-0x00000000c9951fff] usable [ 0.000000] BIOS-e820: [mem 0x00000000c9952000-0x00000000c9958fff] ACPI NVS [ 0.000000] BIOS-e820: [mem 0x00000000c9959000-0x00000000ca1f1fff] usable [ 0.000000] BIOS-e820: [mem 0x00000000ca1f2000-0x00000000ca487fff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000ca488000-0x00000000d98f9fff] usable [ 0.000000] BIOS-e820: [mem 0x00000000d98fa000-0x00000000d9b01fff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000d9b02000-0x00000000d9e1ffff] usable [ 0.000000] BIOS-e820: [mem 0x00000000d9e20000-0x00000000dab0cfff] ACPI NVS [ 0.000000] BIOS-e820: [mem 0x00000000dab0d000-0x00000000daf53fff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000daf54000-0x00000000daffefff] type 20 [ 0.000000] BIOS-e820: [mem 0x00000000dafff000-0x00000000daffffff] usable [ 0.000000] BIOS-e820: [mem 0x00000000dbc00000-0x00000000dfdfffff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000f8000000-0x00000000fbffffff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000fec00000-0x00000000fec00fff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000fed00000-0x00000000fed03fff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000fed1c000-0x00000000fed1ffff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000fee00000-0x00000000fee00fff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000ff000000-0x00000000ffffffff] reserved [ 0.000000] BIOS-e820: [mem 0x0000000100000000-0x000000021f1fffff] usable [ 0.000000] NX (Execute Disable) protection: active [ 0.000000] efi: EFI v2.31 by American Megatrends [ 0.000000] efi: ACPI=0xd9ea4000 ACPI 2.0=0xd9ea4000 SMBIOS=0xdaf52318 [ 0.000000] SMBIOS 2.7 present. [ 0.000000] DMI: ASUSTeK COMPUTER INC. UX301LAA/UX301LAA, BIOS UX301LAA.211 06/05/2015 [ 0.000000] e820: update [mem 0x00000000-0x00000fff] usable ==> reserved [ 0.000000] e820: remove [mem 0x000a0000-0x000fffff] usable [ 0.000000] e820: last_pfn = 0x21f200 max_arch_pfn = 0x400000000 [ 0.000000] MTRR default type: uncachable [ 0.000000] MTRR fixed ranges enabled: [ 0.000000] 00000-9FFFF write-back [ 0.000000] A0000-DFFFF uncachable [ 0.000000] E0000-FFFFF write-protect [ 0.000000] MTRR variable ranges enabled: [ 0.000000] 0 base 0000000000 mask 7E00000000 write-back [ 0.000000] 1 base 0200000000 mask 7FE0000000 write-back [ 0.000000] 2 base 00E0000000 mask 7FE0000000 uncachable [ 0.000000] 3 base 00DC000000 mask 7FFC000000 uncachable [ 0.000000] 4 base 00DBC00000 mask 7FFFC00000 uncachable [ 0.000000] 5 base 021F800000 mask 7FFF800000 uncachable [ 0.000000] 6 base 021F400000 mask 7FFFC00000 uncachable [ 0.000000] 7 base 021F200000 mask 7FFFE00000 uncachable [ 0.000000] 8 disabled [ 0.000000] 9 disabled [ 0.000000] x86/PAT: Configuration [0-7]: WB WC UC- UC WB WC UC- WT [ 0.000000] original variable MTRRs [ 0.000000] reg 0, base: 0GB, range: 8GB, type WB [ 0.000000] reg 1, base: 8GB, range: 512MB, type WB [ 0.000000] reg 2, base: 3584MB, range: 512MB, type UC [ 0.000000] reg 3, base: 3520MB, range: 64MB, type UC [ 0.000000] reg 4, base: 3516MB, range: 4MB, type UC [ 0.000000] reg 5, base: 8696MB, range: 8MB, type UC [ 0.000000] reg 6, base: 8692MB, range: 4MB, type UC [ 0.000000] reg 7, base: 8690MB, range: 2MB, type UC [ 0.000000] total RAM covered: 8110M [ 0.000000] gran_size: 64K chunk_size: 64K num_reg: 10 lose cover RAM: 242M [ 0.000000] gran_size: 64K chunk_size: 128K num_reg: 10 lose cover RAM: 242M [ 0.000000] gran_size: 64K chunk_size: 256K num_reg: 10 lose cover RAM: 242M [ 0.000000] gran_size: 64K chunk_size: 512K num_reg: 10 lose cover RAM: 242M [ 0.000000] gran_size: 64K chunk_size: 1M num_reg: 10 lose cover RAM: 242M [ 0.000000] gran_size: 64K chunk_size: 2M num_reg: 10 lose cover RAM: 242M [ 0.000000] gran_size: 64K chunk_size: 4M num_reg: 10 lose cover RAM: 242M [ 0.000000] gran_size: 64K chunk_size: 8M num_reg: 10 lose cover RAM: 50M [ 0.000000] *BAD*gran_size: 64K chunk_size: 16M num_reg: 10 lose cover RAM: -8M [ 0.000000] *BAD*gran_size: 64K chunk_size: 32M num_reg: 10 lose cover RAM: -8M [ 0.000000] *BAD*gran_size: 64K chunk_size: 64M num_reg: 10 lose cover RAM: -8M [ 0.000000] gran_size: 64K chunk_size: 128M num_reg: 10 lose cover RAM: 0G [ 0.000000] gran_size: 64K chunk_size: 256M num_reg: 10 lose cover RAM: 0G [ 0.000000] gran_size: 64K chunk_size: 512M num_reg: 10 lose cover RAM: 0G [ 0.000000] gran_size: 64K chunk_size: 1G num_reg: 10 lose cover RAM: 0G [ 0.000000] *BAD*gran_size: 64K chunk_size: 2G num_reg: 10 lose cover RAM: -1G [ 0.000000] gran_size: 128K chunk_size: 128K num_reg: 10 lose cover RAM: 242M [ 0.000000] gran_size: 128K chunk_size: 256K num_reg: 10 lose cover RAM: 242M [ 0.000000] gran_size: 128K chunk_size: 512K num_reg: 10 lose cover RAM: 242M [ 0.000000] gran_size: 128K chunk_size: 1M num_reg: 10 lose cover RAM: 242M [ 0.000000] gran_size: 128K chunk_size: 2M num_reg: 10 lose cover RAM: 242M [ 0.000000] gran_size: 128K chunk_size: 4M num_reg: 10 lose cover RAM: 242M [ 0.000000] gran_size: 128K chunk_size: 8M num_reg: 10 lose cover RAM: 50M [ 0.000000] *BAD*gran_size: 128K chunk_size: 16M num_reg: 10 lose cover RAM: -8M [ 0.000000] *BAD*gran_size: 128K chunk_size: 32M num_reg: 10 lose cover RAM: -8M [ 0.000000] *BAD*gran_size: 128K chunk_size: 64M num_reg: 10 lose cover RAM: -8M [ 0.000000] gran_size: 128K chunk_size: 128M num_reg: 10 lose cover RAM: 0G [ 0.000000] gran_size: 128K chunk_size: 256M num_reg: 10 lose cover RAM: 0G [ 0.000000] gran_size: 128K chunk_size: 512M num_reg: 10 lose cover RAM: 0G [ 0.000000] gran_size: 128K chunk_size: 1G num_reg: 10 lose cover RAM: 0G [ 0.000000] *BAD*gran_size: 128K chunk_size: 2G num_reg: 10 lose cover RAM: -1G [ 0.000000] gran_size: 256K chunk_size: 256K num_reg: 10 lose cover RAM: 242M [ 0.000000] gran_size: 256K chunk_size: 512K num_reg: 10 lose cover RAM: 242M [ 0.000000] gran_size: 256K chunk_size: 1M num_reg: 10 lose cover RAM: 242M [ 0.000000] gran_size: 256K chunk_size: 2M num_reg: 10 lose cover RAM: 242M [ 0.000000] gran_size: 256K chunk_size: 4M num_reg: 10 lose cover RAM: 242M [ 0.000000] gran_size: 256K chunk_size: 8M num_reg: 10 lose cover RAM: 50M [ 0.000000] *BAD*gran_size: 256K chunk_size: 16M num_reg: 10 lose cover RAM: -8M [ 0.000000] *BAD*gran_size: 256K chunk_size: 32M num_reg: 10 lose cover RAM: -8M [ 0.000000] *BAD*gran_size: 256K chunk_size: 64M num_reg: 10 lose cover RAM: -8M [ 0.000000] gran_size: 256K chunk_size: 128M num_reg: 10 lose cover RAM: 0G [ 0.000000] gran_size: 256K chunk_size: 256M num_reg: 10 lose cover RAM: 0G [ 0.000000] gran_size: 256K chunk_size: 512M num_reg: 10 lose cover RAM: 0G [ 0.000000] gran_size: 256K chunk_size: 1G num_reg: 10 lose cover RAM: 0G [ 0.000000] *BAD*gran_size: 256K chunk_size: 2G num_reg: 10 lose cover RAM: -1G [ 0.000000] gran_size: 512K chunk_size: 512K num_reg: 10 lose cover RAM: 242M [ 0.000000] gran_size: 512K chunk_size: 1M num_reg: 10 lose cover RAM: 242M [ 0.000000] gran_size: 512K chunk_size: 2M num_reg: 10 lose cover RAM: 242M [ 0.000000] gran_size: 512K chunk_size: 4M num_reg: 10 lose cover RAM: 242M [ 0.000000] gran_size: 512K chunk_size: 8M num_reg: 10 lose cover RAM: 50M [ 0.000000] *BAD*gran_size: 512K chunk_size: 16M num_reg: 10 lose cover RAM: -8M [ 0.000000] *BAD*gran_size: 512K chunk_size: 32M num_reg: 10 lose cover RAM: -8M [ 0.000000] *BAD*gran_size: 512K chunk_size: 64M num_reg: 10 lose cover RAM: -8M [ 0.000000] gran_size: 512K chunk_size: 128M num_reg: 10 lose cover RAM: 0G [ 0.000000] gran_size: 512K chunk_size: 256M num_reg: 10 lose cover RAM: 0G [ 0.000000] gran_size: 512K chunk_size: 512M num_reg: 10 lose cover RAM: 0G [ 0.000000] gran_size: 512K chunk_size: 1G num_reg: 10 lose cover RAM: 0G [ 0.000000] *BAD*gran_size: 512K chunk_size: 2G num_reg: 10 lose cover RAM: -1G [ 0.000000] gran_size: 1M chunk_size: 1M num_reg: 10 lose cover RAM: 242M [ 0.000000] gran_size: 1M chunk_size: 2M num_reg: 10 lose cover RAM: 242M [ 0.000000] gran_size: 1M chunk_size: 4M num_reg: 10 lose cover RAM: 242M [ 0.000000] gran_size: 1M chunk_size: 8M num_reg: 10 lose cover RAM: 50M [ 0.000000] *BAD*gran_size: 1M chunk_size: 16M num_reg: 10 lose cover RAM: -8M [ 0.000000] *BAD*gran_size: 1M chunk_size: 32M num_reg: 10 lose cover RAM: -8M [ 0.000000] *BAD*gran_size: 1M chunk_size: 64M num_reg: 10 lose cover RAM: -8M [ 0.000000] gran_size: 1M chunk_size: 128M num_reg: 10 lose cover RAM: 0G [ 0.000000] gran_size: 1M chunk_size: 256M num_reg: 10 lose cover RAM: 0G [ 0.000000] gran_size: 1M chunk_size: 512M num_reg: 10 lose cover RAM: 0G [ 0.000000] gran_size: 1M chunk_size: 1G num_reg: 10 lose cover RAM: 0G [ 0.000000] *BAD*gran_size: 1M chunk_size: 2G num_reg: 10 lose cover RAM: -1G [ 0.000000] gran_size: 2M chunk_size: 2M num_reg: 10 lose cover RAM: 242M [ 0.000000] gran_size: 2M chunk_size: 4M num_reg: 10 lose cover RAM: 242M [ 0.000000] gran_size: 2M chunk_size: 8M num_reg: 10 lose cover RAM: 50M [ 0.000000] *BAD*gran_size: 2M chunk_size: 16M num_reg: 10 lose cover RAM: -8M [ 0.000000] *BAD*gran_size: 2M chunk_size: 32M num_reg: 10 lose cover RAM: -8M [ 0.000000] *BAD*gran_size: 2M chunk_size: 64M num_reg: 10 lose cover RAM: -8M [ 0.000000] gran_size: 2M chunk_size: 128M num_reg: 10 lose cover RAM: 0G [ 0.000000] gran_size: 2M chunk_size: 256M num_reg: 10 lose cover RAM: 0G [ 0.000000] gran_size: 2M chunk_size: 512M num_reg: 10 lose cover RAM: 0G [ 0.000000] gran_size: 2M chunk_size: 1G num_reg: 10 lose cover RAM: 0G [ 0.000000] *BAD*gran_size: 2M chunk_size: 2G num_reg: 10 lose cover RAM: -1G [ 0.000000] gran_size: 4M chunk_size: 4M num_reg: 10 lose cover RAM: 242M [ 0.000000] gran_size: 4M chunk_size: 8M num_reg: 10 lose cover RAM: 50M [ 0.000000] gran_size: 4M chunk_size: 16M num_reg: 10 lose cover RAM: 50M [ 0.000000] gran_size: 4M chunk_size: 32M num_reg: 9 lose cover RAM: 2M [ 0.000000] gran_size: 4M chunk_size: 64M num_reg: 9 lose cover RAM: 2M [ 0.000000] gran_size: 4M chunk_size: 128M num_reg: 8 lose cover RAM: 2M [ 0.000000] gran_size: 4M chunk_size: 256M num_reg: 8 lose cover RAM: 2M [ 0.000000] gran_size: 4M chunk_size: 512M num_reg: 8 lose cover RAM: 2M [ 0.000000] gran_size: 4M chunk_size: 1G num_reg: 8 lose cover RAM: 2M [ 0.000000] gran_size: 4M chunk_size: 2G num_reg: 9 lose cover RAM: 2M [ 0.000000] gran_size: 8M chunk_size: 8M num_reg: 10 lose cover RAM: 118M [ 0.000000] gran_size: 8M chunk_size: 16M num_reg: 10 lose cover RAM: 54M [ 0.000000] gran_size: 8M chunk_size: 32M num_reg: 9 lose cover RAM: 6M [ 0.000000] gran_size: 8M chunk_size: 64M num_reg: 9 lose cover RAM: 6M [ 0.000000] gran_size: 8M chunk_size: 128M num_reg: 8 lose cover RAM: 6M [ 0.000000] gran_size: 8M chunk_size: 256M num_reg: 8 lose cover RAM: 6M [ 0.000000] gran_size: 8M chunk_size: 512M num_reg: 8 lose cover RAM: 6M [ 0.000000] gran_size: 8M chunk_size: 1G num_reg: 8 lose cover RAM: 6M [ 0.000000] gran_size: 8M chunk_size: 2G num_reg: 9 lose cover RAM: 6M [ 0.000000] gran_size: 16M chunk_size: 16M num_reg: 10 lose cover RAM: 62M [ 0.000000] gran_size: 16M chunk_size: 32M num_reg: 9 lose cover RAM: 14M [ 0.000000] gran_size: 16M chunk_size: 64M num_reg: 9 lose cover RAM: 14M [ 0.000000] gran_size: 16M chunk_size: 128M num_reg: 8 lose cover RAM: 14M [ 0.000000] gran_size: 16M chunk_size: 256M num_reg: 8 lose cover RAM: 14M [ 0.000000] gran_size: 16M chunk_size: 512M num_reg: 8 lose cover RAM: 14M [ 0.000000] gran_size: 16M chunk_size: 1G num_reg: 8 lose cover RAM: 14M [ 0.000000] gran_size: 16M chunk_size: 2G num_reg: 9 lose cover RAM: 14M [ 0.000000] gran_size: 32M chunk_size: 32M num_reg: 10 lose cover RAM: 46M [ 0.000000] gran_size: 32M chunk_size: 64M num_reg: 9 lose cover RAM: 46M [ 0.000000] gran_size: 32M chunk_size: 128M num_reg: 8 lose cover RAM: 46M [ 0.000000] gran_size: 32M chunk_size: 256M num_reg: 8 lose cover RAM: 46M [ 0.000000] gran_size: 32M chunk_size: 512M num_reg: 8 lose cover RAM: 46M [ 0.000000] gran_size: 32M chunk_size: 1G num_reg: 8 lose cover RAM: 46M [ 0.000000] gran_size: 32M chunk_size: 2G num_reg: 9 lose cover RAM: 46M [ 0.000000] gran_size: 64M chunk_size: 64M num_reg: 8 lose cover RAM: 110M [ 0.000000] gran_size: 64M chunk_size: 128M num_reg: 7 lose cover RAM: 110M [ 0.000000] gran_size: 64M chunk_size: 256M num_reg: 7 lose cover RAM: 110M [ 0.000000] gran_size: 64M chunk_size: 512M num_reg: 7 lose cover RAM: 110M [ 0.000000] gran_size: 64M chunk_size: 1G num_reg: 7 lose cover RAM: 110M [ 0.000000] gran_size: 64M chunk_size: 2G num_reg: 8 lose cover RAM: 110M [ 0.000000] gran_size: 128M chunk_size: 128M num_reg: 7 lose cover RAM: 174M [ 0.000000] gran_size: 128M chunk_size: 256M num_reg: 7 lose cover RAM: 174M [ 0.000000] gran_size: 128M chunk_size: 512M num_reg: 7 lose cover RAM: 174M [ 0.000000] gran_size: 128M chunk_size: 1G num_reg: 7 lose cover RAM: 174M [ 0.000000] gran_size: 128M chunk_size: 2G num_reg: 8 lose cover RAM: 174M [ 0.000000] gran_size: 256M chunk_size: 256M num_reg: 5 lose cover RAM: 430M [ 0.000000] gran_size: 256M chunk_size: 512M num_reg: 7 lose cover RAM: 430M [ 0.000000] gran_size: 256M chunk_size: 1G num_reg: 7 lose cover RAM: 430M [ 0.000000] gran_size: 256M chunk_size: 2G num_reg: 8 lose cover RAM: 430M [ 0.000000] gran_size: 512M chunk_size: 512M num_reg: 3 lose cover RAM: 942M [ 0.000000] gran_size: 512M chunk_size: 1G num_reg: 3 lose cover RAM: 942M [ 0.000000] gran_size: 512M chunk_size: 2G num_reg: 3 lose cover RAM: 942M [ 0.000000] gran_size: 1G chunk_size: 1G num_reg: 3 lose cover RAM: 942M [ 0.000000] gran_size: 1G chunk_size: 2G num_reg: 3 lose cover RAM: 942M [ 0.000000] gran_size: 2G chunk_size: 2G num_reg: 2 lose cover RAM: 1966M [ 0.000000] mtrr_cleanup: can not find optimal value [ 0.000000] please specify mtrr_gran_size/mtrr_chunk_size