I modified tlp for max performance but tlp starts only when desktop boots.
So, kernel boot is slow.

2017-11-02 8:57 GMT+02:00 Kai-Heng Feng <email address hidden>:

> Did you change the SATA link power management or other settings?
>
> Can you attach the diff of your TLP setting?
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1726159
>
> Title:
>   PCIe BUS Error causing really slow laptop performance
>
> Status in linux package in Ubuntu:
>   Confirmed
>
> Bug description:
>   I recently bought the following laptop:
>   Asus VivoBook X542UQ-DM148T - 15.6" (i7-7500U/8GB/256GB/GT 940MX 2GB)
>
>   It came pre-installed with Win10 and I did a fresh install of Ubuntu
>   16.04 LTS. The screen was flickering for some reason and installing
>   Ubuntu 17.04 fixed the issue.
>
>   The real problem is that when I'm booting the laptop, the following
>   error is being shown on my screen:
>
>   [   12.866073] pcieport 0000:00:1c.5: can't find device of ID00e5
>   [   12.898481] pcieport 0000:00:1c.5: AER: Multiple Corrected error
> received: id=00e5
>   [   12.898488] pcieport 0000:00:1c.5: PCIe Bus Error:
> severity=Corrected, type=Physical Layer, id=00e5(Receiver ID)
>   [   12.898491] pcieport 0000:00:1c.5:   device [8086:9d15] error
> status/mask=00002041/00002000
>   [   12.898492] pcieport 0000:00:1c.5:    [ 0] Receiver Error
>  (First)
>   [   12.898493] pcieport 0000:00:1c.5:    [ 6] Bad TLP
>
>   I know that this error can be hid with one of the following kernel boot
> arguments:
>   pci=nomsi / pci=noaer / pcie_aspm=off / pci=nommconf.
>
>   The weird thing is that the above output is only being shown when the
>   laptop is on AC Power (charging). When the laptop is not connected to
>   AC (battery-mode), it has performance issues (slow boot and slow
>   application launching). I was trying all day long to fix the problem.
>   I removed everything that had to do with power-saving, reinstalled,
>   re-tweaked for performance, tried different kernels but had no luck.
>   While diagnosing, I had the idea to benchmark the "M2 SATA-3 SSD" that
>   my laptop had. The results are:
>
>   * On AC Power: 522MB/s (READ) | 416MB/s (WRITE)
>   * On Battery Power: 32MB/s (READ) | 31MB/s (WRITE)
>
>   This explains everyting. That's why I'm having a slow boot and slow
>   application launching!
>
>   Commands "lspci" and "dmesg" say that the error comes from the following
> device:
>   00:1c.5 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root
> Port #6 (rev f1)
>
>   I will attach lspci and dmesg output on a tar.gz file.
>
>   ------------------------------------------------------------
> --------------
>   UPDATE: When the laptop is fully charged and still on AC (but not
> charging since it is 100% charged), the errors appear again but the SSD
> speed is normal (~500 Read/Write).
>   ------------------------------------------------------------
> --------------
>   UPDATE: I installed 'tlp' Advanced Power Management package and when
> using the command 'tlp ac', the SSD speed gets back to normal! The option
> does not persist across reboots.
>   ------------------------------------------------------------
> --------------
>
>   ProblemType: Bug
>   DistroRelease: Ubuntu 17.04
>   Package: linux-image-4.10.0-37-generic 4.10.0-37.41
>   ProcVersionSignature: Ubuntu 4.10.0-37.41-generic 4.10.17
>   Uname: Linux 4.10.0-37-generic x86_64
>   ApportVersion: 2.20.4-0ubuntu4.5
>   Architecture: amd64
>   AudioDevicesInUse:
>    USER        PID ACCESS COMMAND
>    /dev/snd/controlC0:  georgem    2557 F.... pulseaudio
>   CurrentDesktop: Unity:Unity7
>   Date: Sun Oct 22 23:17:57 2017
>   InstallationDate: Installed on 2017-10-20 (2 days ago)
>   InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
>   Lsusb:
>    Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
>    Bus 001 Device 004: ID 13d3:3496 IMC Networks
>    Bus 001 Device 003: ID 13d3:5a01 IMC Networks
>    Bus 001 Device 002: ID 046d:c52b Logitech, Inc. Unifying Receiver
>    Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
>   MachineType: ASUSTeK COMPUTER INC. X542UQ
>   ProcFB: 0 inteldrmfb
>   ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-37-generic.efi.signed
> root=UUID=38d32efc-d0cb-4a82-9e6c-e6a3bd62e51d ro quiet splash
> vt.handoff=7
>   RelatedPackageVersions:
>    linux-restricted-modules-4.10.0-37-generic N/A
>    linux-backports-modules-4.10.0-37-generic  N/A
>    linux-firmware                             1.164.1
>   SourcePackage: linux
>   UpgradeStatus: No upgrade log present (probably fresh install)
>   dmi.bios.date: 05/18/2017
>   dmi.bios.vendor: American Megatrends Inc.
>   dmi.bios.version: X542UQ.202
>   dmi.board.asset.tag: ATN12345678901234567
>   dmi.board.name: X542UQ
>   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.:bvrX542UQ.202:bd05/18/2017:
> svnASUSTeKCOMPUTERINC.:pnX542UQ:pvr1.0:rvnASUSTeKCOMPUTERINC.:
> rnX542UQ:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
>   dmi.product.name: X542UQ
>   dmi.product.version: 1.0
>   dmi.sys.vendor: ASUSTeK COMPUTER INC.
>
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