Ubuntu
linux package

Ubuntu 15.04: Bad MTRR memory management

Bug #1435210 reported by aljosa on 2015-03-23

This bug affects 5 people

Affects		Status	Importance	Assigned to	Milestone
	linux (Ubuntu)	Confirmed	Medium	Unassigned

Bug Description

Hello,
in order to contribute to quality improvement of the new Ubuntu 15.04, I'm reporting a problem I found in this "beta" version - related to MTRR memory management (mtrr_gran_size/mtrr_chunk_size stuff).

If compared with Manjaro XFCE 0.9.0-pre4 edition (systemd, X.org server 1.17.1, kernel 1.19.1), it is quite obvious that there's definitely something wrong with the way how Ubuntu handles 16GB of RAM (inside BIOS, Intel graphics card is set to 256MB).

Asus optimus notebook N750JVT-4069H (Intel® Core™ i7-4700HQ; RAM 16GB; Nvidia GeForce GT750M)

Manjaro dmesg output:

[ 0.000000] DMI: ASUSTeK COMPUTER INC. N750JV/N750JV, BIOS N750JV.210 04/11/2014
[ 0.000000] e820: update [mem 0x00000000-0x00000fff] usable ==> reserved
[ 0.000000] e820: remove [mem 0x000a0000-0x000fffff] usable
[ 0.000000] AGP: No AGP bridge found
[ 0.000000] e820: last_pfn = 0x42f200 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 7C00000000 write-back
[ 0.000000] 1 base 0400000000 mask 7FE0000000 write-back
[ 0.000000] 2 base 0420000000 mask 7FF8000000 write-back
[ 0.000000] 3 base 0428000000 mask 7FFC000000 write-back
[ 0.000000] 4 base 042C000000 mask 7FFE000000 write-back
[ 0.000000] 5 base 042E000000 mask 7FFF000000 write-back
[ 0.000000] 6 base 042F000000 mask 7FFFE00000 write-back
[ 0.000000] 7 base 00C0000000 mask 7FC0000000 uncachable
[ 0.000000] 8 base 00BFC00000 mask 7FFFC00000 uncachable
[ 0.000000] 9 disabled
[ 0.000000] PAT configuration [0-7]: WB WC UC- UC WB WC UC- UC
[ 0.000000] e820: update [mem 0xbfc00000-0xffffffff] usable ==> reserved
[ 0.000000] e820: last_pfn = 0xbf000 max_arch_pfn = 0x400000000
[ 0.000000] Scanning 1 areas for low memory corruption

Ubuntu dmesg output:

[ 0.000000] DMI: ASUSTeK [ 0.000000] e820: [ 0.000000] e820: [ 0.000000] AGP: No [ 0.000000] e820: [ 0.000000] MTRR default [ 0.000000] MTRR fixed [ 0.000000] 00000-9FFFF [ 0.000000] A0000-DFFFF [ 0.000000] E0000-FFFFF [ 0.000000] MTRR variable [ 0.000000] 0 base [ 0.000000] 1 base [ 0.000000] 2 base [ 0.000000] 3 base [ 0.000000] 4 base [ 0.000000] 5 base [ 0.000000] 6 base [ 0.000000] 7 base [ 0.000000] 8 base [ 0.000000] 9 disabled
[ 0.000000] PAT configuration [0-7]: WB [ 0.000000] original [ 0.000000] reg 0, [ 0.000000] reg 1, [ 0.000000] reg 2, [ 0.000000] reg 3, [ 0.000000] reg 4, [ 0.000000] reg 5, [ 0.000000] reg 6, [ 0.000000] reg 7, [ 0.000000] reg 8, [ 0.000000] total [ 0.000000] gran_size: 64K [ 0.000000] gran_size: 64K [ 0.000000] gran_size: 64K [ 0.000000] gran_size: 64K [ 0.000000] gran_size: 64K [ 0.000000] gran_size: 64K [ 0.000000] gran_size: 64K [ 0.000000] gran_size: 64K [ 0.000000] gran_size: 64K [ 0.000000] gran_size: 64K [ 0.000000] gran_size: 64K [ 0.000000] gran_size: 64K [ 0.000000] gran_size: 64K [ 0.000000] gran_size: 64K [ 0.000000] gran_size: 64K [ 0.000000] *BAD*gran_size: 64K [ 0.000000] gran_size: 128K [ 0.000000] gran_size: 128K [ 0.000000] gran_size: 128K [ 0.000000] gran_size: 128K [ 0.000000] gran_size: 128K [ 0.000000] gran_size: 128K [ 0.000000] gran_size: 128K [ 0.000000] gran_size: 128K [ 0.000000] gran_size: 128K [ 0.000000] gran_size: 128K [ 0.000000] gran_size: 128K [ 0.000000] gran_size: 128K [ 0.000000] gran_size: 128K [ 0.000000] gran_size: 128K [ 0.000000] *BAD*gran_size: 128K [ 0.000000] gran_size: 256K [ 0.000000] gran_size: 256K [ 0.000000] gran_size: 256K [ 0.000000] gran_size: 256K [ 0.000000] gran_size: 256K [ 0.000000] gran_size: 256K [ 0.000000] gran_size: 256K [ 0.000000] gran_size: 256K [ 0.000000] gran_size: 256K [ 0.000000] gran_size: 256K [ 0.000000] gran_size: 256K [ 0.000000] gran_size: 256K [ 0.000000] gran_size: 256K [ 0.000000] *BAD*gran_size: 256K [ 0.000000] gran_size: 512K [ 0.000000] gran_size: 512K [ 0.000000] gran_size: 512K [ 0.000000] gran_size: 512K [ 0.000000] gran_size: 512K [ 0.000000] gran_size: 512K [ 0.000000] gran_size: 512K [ 0.000000] gran_size: 512K [ 0.000000] gran_size: 512K [ 0.000000] gran_size: 512K [ 0.000000] gran_size: 512K [ 0.000000] gran_size: 512K [ 0.000000] *BAD*gran_size: 512K [ 0.000000] gran_size: 1M [ 0.000000] gran_size: 1M [ 0.000000] gran_size: 1M [ 0.000000] gran_size: 1M [ 0.000000] gran_size: 1M [ 0.000000] gran_size: 1M [ 0.000000] gran_size: 1M [ 0.000000] gran_size: 1M [ 0.000000] gran_size: 1M [ 0.000000] gran_size: 1M [ 0.000000] gran_size: 1M [ 0.000000] *BAD*gran_size: 1M [ 0.000000] gran_size: 2M [ 0.000000] gran_size: 2M [ 0.000000] gran_size: 2M [ 0.000000] gran_size: 2M [ 0.000000] gran_size: 2M [ 0.000000] gran_size: 2M [ 0.000000] gran_size: 2M [ 0.000000] gran_size: 2M [ 0.000000] gran_size: 2M [ 0.000000] gran_size: 2M [ 0.000000] *BAD*gran_size: 2M [ 0.000000] gran_size: 4M [ 0.000000] gran_size: 4M [ 0.000000] gran_size: 4M [ 0.000000] gran_size: 4M [ 0.000000] gran_size: 4M [ 0.000000] gran_size: 4M [ 0.000000] gran_size: 4M [ 0.000000] gran_size: 4M [ 0.000000] gran_size: 4M [ 0.000000] gran_size: 4M [ 0.000000] gran_size: 8M [ 0.000000] gran_size: 8M [ 0.000000] gran_size: 8M [ 0.000000] gran_size: 8M [ 0.000000] gran_size: 8M [ 0.000000] gran_size: 8M [ 0.000000] gran_size: 8M [ 0.000000] gran_size: 8M [ 0.000000] gran_size: 8M [ 0.000000] gran_size: 16M [ 0.000000] gran_size: 16M [ 0.000000] gran_size: 16M [ 0.000000] gran_size: 16M [ 0.000000] gran_size: 16M [ 0.000000] gran_size: 16M [ 0.000000] gran_size: 16M [ 0.000000] gran_size: 16M [ 0.000000] gran_size: 32M [ 0.000000] gran_size: 32M [ 0.000000] gran_size: 32M [ 0.000000] gran_size: 32M [ 0.000000] gran_size: 32M [ 0.000000] gran_size: 32M [ 0.000000] gran_size: 32M [ 0.000000] gran_size: 64M [ 0.000000] gran_size: 64M [ 0.000000] gran_size: 64M [ 0.000000] gran_size: 64M [ 0.000000] gran_size: 64M [ 0.000000] gran_size: 64M [ 0.000000] gran_size: 128M [ 0.000000] gran_size: 128M [ 0.000000] gran_size: 128M [ 0.000000] gran_size: 128M [ 0.000000] gran_size: 128M [ 0.000000] gran_size: 256M [ 0.000000] gran_size: 256M [ 0.000000] gran_size: 256M [ 0.000000] gran_size: 256M [ 0.000000] gran_size: 512M [ 0.000000] gran_size: 512M [ 0.000000] gran_size: 512M [ 0.000000] gran_size: 1G [ 0.000000] gran_size: 1G [ 0.000000] gran_size: 2G [ 0.000000] mtrr_cleanup: [ 0.000000] please [ 0.000000] e820: [ 0.000000] e820: [ 0.000000] Scanning COMPUTER INC. N750JV/N750JV, BIOS N750JV.210 04/11/2014
update [mem 0x00000000-0x00000fff] usable ==> reserved
remove [mem 0x000a0000-0x000fffff] usable
AGP bridge found
last_pfn = 0x42f200 max_arch_pfn = 0x400000000
type: uncachable
ranges enabled:
write-back
uncachable
write-protect
ranges enabled:
0000000000 mask 7C00000000 write-back
0400000000 mask 7FE0000000 write-back
0420000000 mask 7FF8000000 write-back
0428000000 mask 7FFC000000 write-back
042C000000 mask 7FFE000000 write-back
042E000000 mask 7FFF000000 write-back
042F000000 mask 7FFFE00000 write-back
00C0000000 mask 7FC0000000 uncachable
00BFC00000 mask 7FFFC00000 uncachable
WC UC- UC WB WC UC- UC
variable MTRRs
base: 0GB, range: 16GB, type WB
base: 16GB, range: 512MB, type WB
base: 16896MB, range: 128MB, type WB
base: 17024MB, range: 64MB, type WB
base: 17088MB, range: 32MB, type WB
base: 17120MB, range: 16MB, type WB
base: 17136MB, range: 2MB, type WB
base: 3GB, range: 1GB, type UC
base: 3068MB, range: 4MB, type UC
RAM covered: 16110M
chunk_size: 64K num_reg: 10 lose cover RAM: 8946M
chunk_size: 128K num_reg: 10 lose cover RAM: 8946M
chunk_size: 256K num_reg: 10 lose cover RAM: 8946M
chunk_size: 512K num_reg: 10 lose cover RAM: 8946M
chunk_size: 1M num_reg: 10 lose cover RAM: 8946M
chunk_size: 2M num_reg: 10 lose cover RAM: 8946M
chunk_size: 4M num_reg: 10 lose cover RAM: 8946M
chunk_size: 8M num_reg: 10 lose cover RAM: 2M
chunk_size: 16M num_reg: 10 lose cover RAM: 0G
chunk_size: 32M num_reg: 10 lose cover RAM: 0G
chunk_size: 64M num_reg: 10 lose cover RAM: 0G
chunk_size: 128M num_reg: 10 lose cover RAM: 0G
chunk_size: 256M num_reg: 10 lose cover RAM: 0G
chunk_size: 512M num_reg: 10 lose cover RAM: 0G
chunk_size: 1G num_reg: 10 lose cover RAM: 0G
chunk_size: 2G num_reg: 10 lose cover RAM: -1G
chunk_size: 128K num_reg: 10 lose cover RAM: 8946M
chunk_size: 256K num_reg: 10 lose cover RAM: 8946M
chunk_size: 512K num_reg: 10 lose cover RAM: 8946M
chunk_size: 1M num_reg: 10 lose cover RAM: 8946M
chunk_size: 2M num_reg: 10 lose cover RAM: 8946M
chunk_size: 4M num_reg: 10 lose cover RAM: 8946M
chunk_size: 8M num_reg: 10 lose cover RAM: 2M
chunk_size: 16M num_reg: 10 lose cover RAM: 0G
chunk_size: 32M num_reg: 10 lose cover RAM: 0G
chunk_size: 64M num_reg: 10 lose cover RAM: 0G
chunk_size: 128M num_reg: 10 lose cover RAM: 0G
chunk_size: 256M num_reg: 10 lose cover RAM: 0G
chunk_size: 512M num_reg: 10 lose cover RAM: 0G
chunk_size: 1G num_reg: 10 lose cover RAM: 0G
chunk_size: 2G num_reg: 10 lose cover RAM: -1G
chunk_size: 256K num_reg: 10 lose cover RAM: 8946M
chunk_size: 512K num_reg: 10 lose cover RAM: 8946M
chunk_size: 1M num_reg: 10 lose cover RAM: 8946M
chunk_size: 2M num_reg: 10 lose cover RAM: 8946M
chunk_size: 4M num_reg: 10 lose cover RAM: 8946M
chunk_size: 8M num_reg: 10 lose cover RAM: 2M
chunk_size: 16M num_reg: 10 lose cover RAM: 0G
chunk_size: 32M num_reg: 10 lose cover RAM: 0G
chunk_size: 64M num_reg: 10 lose cover RAM: 0G
chunk_size: 128M num_reg: 10 lose cover RAM: 0G
chunk_size: 256M num_reg: 10 lose cover RAM: 0G
chunk_size: 512M num_reg: 10 lose cover RAM: 0G
chunk_size: 1G num_reg: 10 lose cover RAM: 0G
chunk_size: 2G num_reg: 10 lose cover RAM: -1G
chunk_size: 512K num_reg: 10 lose cover RAM: 8946M
chunk_size: 1M num_reg: 10 lose cover RAM: 8946M
chunk_size: 2M num_reg: 10 lose cover RAM: 8946M
chunk_size: 4M num_reg: 10 lose cover RAM: 8946M
chunk_size: 8M num_reg: 10 lose cover RAM: 2M
chunk_size: 16M num_reg: 10 lose cover RAM: 0G
chunk_size: 32M num_reg: 10 lose cover RAM: 0G
chunk_size: 64M num_reg: 10 lose cover RAM: 0G
chunk_size: 128M num_reg: 10 lose cover RAM: 0G
chunk_size: 256M num_reg: 10 lose cover RAM: 0G
chunk_size: 512M num_reg: 10 lose cover RAM: 0G
chunk_size: 1G num_reg: 10 lose cover RAM: 0G
chunk_size: 2G num_reg: 10 lose cover RAM: -1G
chunk_size: 1M num_reg: 10 lose cover RAM: 8946M
chunk_size: 2M num_reg: 10 lose cover RAM: 8946M
chunk_size: 4M num_reg: 10 lose cover RAM: 8946M
chunk_size: 8M num_reg: 10 lose cover RAM: 2M
chunk_size: 16M num_reg: 10 lose cover RAM: 0G
chunk_size: 32M num_reg: 10 lose cover RAM: 0G
chunk_size: 64M num_reg: 10 lose cover RAM: 0G
chunk_size: 128M num_reg: 10 lose cover RAM: 0G
chunk_size: 256M num_reg: 10 lose cover RAM: 0G
chunk_size: 512M num_reg: 10 lose cover RAM: 0G
chunk_size: 1G num_reg: 10 lose cover RAM: 0G
chunk_size: 2G num_reg: 10 lose cover RAM: -1G
chunk_size: 2M num_reg: 10 lose cover RAM: 8946M
chunk_size: 4M num_reg: 10 lose cover RAM: 8946M
chunk_size: 8M num_reg: 10 lose cover RAM: 2M
chunk_size: 16M num_reg: 10 lose cover RAM: 0G
chunk_size: 32M num_reg: 10 lose cover RAM: 0G
chunk_size: 64M num_reg: 10 lose cover RAM: 0G
chunk_size: 128M num_reg: 10 lose cover RAM: 0G
chunk_size: 256M num_reg: 10 lose cover RAM: 0G
chunk_size: 512M num_reg: 10 lose cover RAM: 0G
chunk_size: 1G num_reg: 10 lose cover RAM: 0G
chunk_size: 2G num_reg: 10 lose cover RAM: -1G
chunk_size: 4M num_reg: 10 lose cover RAM: 8946M
chunk_size: 8M num_reg: 10 lose cover RAM: 2M
chunk_size: 16M num_reg: 10 lose cover RAM: 2M
chunk_size: 32M num_reg: 8 lose cover RAM: 2M
chunk_size: 64M num_reg: 8 lose cover RAM: 2M
chunk_size: 128M num_reg: 8 lose cover RAM: 2M
chunk_size: 256M num_reg: 8 lose cover RAM: 2M
chunk_size: 512M num_reg: 8 lose cover RAM: 2M
chunk_size: 1G num_reg: 8 lose cover RAM: 2M
chunk_size: 2G num_reg: 9 lose cover RAM: 2M
chunk_size: 8M num_reg: 10 lose cover RAM: 758M
chunk_size: 16M num_reg: 10 lose cover RAM: 6M
chunk_size: 32M num_reg: 8 lose cover RAM: 6M
chunk_size: 64M num_reg: 8 lose cover RAM: 6M
chunk_size: 128M num_reg: 8 lose cover RAM: 6M
chunk_size: 256M num_reg: 8 lose cover RAM: 6M
chunk_size: 512M num_reg: 8 lose cover RAM: 6M
chunk_size: 1G num_reg: 8 lose cover RAM: 6M
chunk_size: 2G num_reg: 9 lose cover RAM: 6M
chunk_size: 16M num_reg: 10 lose cover RAM: 254M
chunk_size: 32M num_reg: 8 lose cover RAM: 14M
chunk_size: 64M num_reg: 8 lose cover RAM: 14M
chunk_size: 128M num_reg: 8 lose cover RAM: 14M
chunk_size: 256M num_reg: 8 lose cover RAM: 14M
chunk_size: 512M num_reg: 8 lose cover RAM: 14M
chunk_size: 1G num_reg: 8 lose cover RAM: 14M
chunk_size: 2G num_reg: 9 lose cover RAM: 14M
chunk_size: 32M num_reg: 10 lose cover RAM: 142M
chunk_size: 64M num_reg: 8 lose cover RAM: 46M
chunk_size: 128M num_reg: 8 lose cover RAM: 46M
chunk_size: 256M num_reg: 8 lose cover RAM: 46M
chunk_size: 512M num_reg: 8 lose cover RAM: 46M
chunk_size: 1G num_reg: 8 lose cover RAM: 46M
chunk_size: 2G num_reg: 9 lose cover RAM: 46M
chunk_size: 64M num_reg: 10 lose cover RAM: 110M
chunk_size: 128M num_reg: 8 lose cover RAM: 110M
chunk_size: 256M num_reg: 8 lose cover RAM: 110M
chunk_size: 512M num_reg: 8 lose cover RAM: 110M
chunk_size: 1G num_reg: 8 lose cover RAM: 110M
chunk_size: 2G num_reg: 9 lose cover RAM: 110M
chunk_size: 128M num_reg: 8 lose cover RAM: 238M
chunk_size: 256M num_reg: 8 lose cover RAM: 238M
chunk_size: 512M num_reg: 8 lose cover RAM: 238M
chunk_size: 1G num_reg: 8 lose cover RAM: 238M
chunk_size: 2G num_reg: 9 lose cover RAM: 238M
chunk_size: 256M num_reg: 6 lose cover RAM: 494M
chunk_size: 512M num_reg: 6 lose cover RAM: 494M
chunk_size: 1G num_reg: 7 lose cover RAM: 494M
chunk_size: 2G num_reg: 8 lose cover RAM: 494M
chunk_size: 512M num_reg: 5 lose cover RAM: 750M
chunk_size: 1G num_reg: 7 lose cover RAM: 750M
chunk_size: 2G num_reg: 8 lose cover RAM: 750M
chunk_size: 1G num_reg: 3 lose cover RAM: 1774M
chunk_size: 2G num_reg: 3 lose cover RAM: 1774M
chunk_size: 2G num_reg: 3 lose cover RAM: 1774M
can not find optimal value
specify mtrr_gran_size/mtrr_chunk_size
update [mem 0xbfc00000-0xffffffff] usable ==> reserved
last_pfn = 0xbf000 max_arch_pfn = 0x400000000
1 areas for low memory corruption

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: linux-image-3.19.0-9-generic 3.19.0-9.9 [modified: boot/vmlinuz-3.19.0-9-generic]
ProcVersionSignature: Ubuntu 3.19.0-9.9-generic 3.19.1
Uname: Linux 3.19.0-9-generic x86_64
ApportVersion: 2.16.2-0ubuntu4
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: aljosa 1824 F.... pulseaudio
/dev/snd/controlC0: aljosa 1824 F.... pulseaudio
CurrentDesktop: Unity
Date: Mon Mar 23 09:52:24 2015
HibernationDevice: RESUME=UUID=df42f272-c519-4323-977d-bb1fe697e7f0
InstallationDate: Installed on 2015-03-19 (3 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20150318)
MachineType: ASUSTeK COMPUTER INC. N750JV
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-9-generic.efi.signed root=UUID=da571e57-f1af-49b1-95ba-206e95c86cec ro quiet splash ipv6.disable=1 vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.19.0-9-generic N/A
linux-backports-modules-3.19.0-9-generic N/A
linux-firmware 1.143
SourcePackage: linux
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/11/2014
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: N750JV.210
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: N750JV
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrN750JV.210:bd04/11/2014:svnASUSTeKCOMPUTERINC.:pnN750JV:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnN750JV:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
dmi.product.name: N750JV
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.

Tags:

Revision history for this message

aljosa (aljosa-p) wrote on 2015-03-23:

AlsaInfo.txt Edit (38.1 KiB, text/plain; charset="utf-8")
CRDA.txt Edit (238 bytes, text/plain; charset="utf-8")
CurrentDmesg.txt Edit (92.4 KiB, text/plain; charset="utf-8")
Dependencies.txt Edit (2.3 KiB, text/plain; charset="utf-8")
IwConfig.txt Edit (251 bytes, text/plain; charset="utf-8")
Lspci.txt Edit (11.5 KiB, text/plain; charset="utf-8")
Lsusb.txt Edit (510 bytes, text/plain; charset="utf-8")
ProcCpuinfo.txt Edit (8.0 KiB, text/plain; charset="utf-8")
ProcEnviron.txt Edit (316 bytes, text/plain; charset="utf-8")
ProcInterrupts.txt Edit (3.9 KiB, text/plain; charset="utf-8")
ProcModules.txt Edit (5.8 KiB, text/plain; charset="utf-8")
PulseList.txt Edit (23.2 KiB, text/plain; charset="utf-8")
RfKill.txt Edit (186 bytes, text/plain; charset="utf-8")
UdevDb.txt Edit (177.5 KiB, text/plain; charset="utf-8")
WifiSyslog.txt Edit (121.9 KiB, text/plain; charset="utf-8")

Revision history for this message

Brad Figg (brad-figg) wrote on 2015-03-23: Status changed to Confirmed

This change was made by a bot.

Changed in linux (Ubuntu):
status:	New → Confirmed

Revision history for this message

Joseph Salisbury (jsalisbury) wrote on 2015-03-23:

Did this issue start happening after an update/upgrade? Was there a prior kernel version where you were not having this particular problem?

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.0 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.0-rc5-vivid/

Changed in linux (Ubuntu):
importance:	Undecided → Medium
status:	Confirmed → Incomplete

Revision history for this message

aljosa (aljosa-p) wrote on 2015-03-23:

dmesg output with kernel 4.0-rc5 Edit (97.1 KiB, text/plain)

This problem is 2-3 years old, and it is present in Ubuntu 13.10; 14.04 and 14.10

As suggested, I have just installed the latest 4.0-rc5 kernel. The problem is still here :(
I'm attaching a txt file with the dmesg output using kernel 4.0-rc5.

tags:

added: kernel-bug-exists-upstream

aljosa (aljosa-p) on 2015-04-02

Changed in linux (Ubuntu):
status:	Incomplete → Confirmed

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Ubuntulinux package

Ubuntu 15.04: Bad MTRR memory management

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