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).
I don't think that the CPU frequency has a limit when on battery-mode. The problem is related with my stock SSD (the laptop came with). ** Description changed: 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). + -------------------------------------------------------------------------- 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. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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). -------------------------------------------------------------------------- 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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