I did some further testing and it seems I have found a culprit and a solution. In older kernel versions (3.19.8 and 4.0.9 worked flawlessly without extra boot parameters) I get something like this when booting:
ACPI BIOS Warning (bug): 32/64X address mismatch in FADT/Pm2ControlBlock: 0x00008800/0x0000000000008100, using 32-bit address But in newer kernel version the behavior has changed so that it instead uses 64-bit adress! This is solved by adding the boot parameter "acpi_force_32bit_fadt_addr" and voilá, the problem is gone. So why has the default behavior changed, and why must it be up to the user to set the workaround in kernel options? Couldn't the kernel detect the hardware and use 32-bit registers itself? Additionally, for this machine to work properly with 4.4.0-34 I must add noapic or/and nolapic to boot parameters. Otherwise, the fan is at max speed all the time and the computer gets very sluggish, it fails to reboot properly - however the disk benchmark test works fine. I suspect I shall have to open a different bug report for these issues. -- 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/1590154 Title: System slow unless using touchpad Status in linux package in Ubuntu: Triaged Bug description: I tested this installing the Disks tool and running a read-only benchmark. The transfer rate is very slow (2-3 MB/s) unless I'm moving the cursor, then it jumps up. As I understand this could have something to do with triggering/handling interrupts. In this context it might be relevant to know that installing and running Xenial, I now need to have nolapic or noapic (or both) for the system to work at all. This is not the case with Trusty (also installed on this machine). ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-22-generic 4.4.0-22.40 ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8 Uname: Linux 4.4.0-22-generic x86_64 NonfreeKernelModules: wl ApportVersion: 2.20.1-0ubuntu2.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: diskdoc 1089 F.... pulseaudio CurrentDesktop: XFCE Date: Wed Jun 8 00:07:19 2016 HibernationDevice: RESUME=UUID=522810df-638a-412b-9aab-791e2e2bc545 InstallationDate: Installed on 2016-06-07 (0 days ago) InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1) MachineType: Hewlett-Packard HP Compaq 6715s (RU655ET#AK8) PccardctlIdent: Socket 0: no product info available PccardctlStatus: Socket 0: no card ProcFB: 0 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-22-generic root=UUID=3a37ee65-4c02-4a95-b814-f4538a4a308d ro noapic quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-4.4.0-22-generic N/A linux-backports-modules-4.4.0-22-generic N/A linux-firmware 1.157 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 11/25/2008 dmi.bios.vendor: Hewlett-Packard dmi.bios.version: 68YTT Ver. F.0E dmi.board.name: 30C2 dmi.board.vendor: Hewlett-Packard dmi.board.version: KBC Version 71.2D dmi.chassis.asset.tag: CNU7201T8J dmi.chassis.type: 10 dmi.chassis.vendor: Hewlett-Packard dmi.modalias: dmi:bvnHewlett-Packard:bvr68YTTVer.F.0E:bd11/25/2008:svnHewlett-Packard:pnHPCompaq6715s(RU655ET#AK8):pvrF.0E:rvnHewlett-Packard:rn30C2:rvrKBCVersion71.2D:cvnHewlett-Packard:ct10:cvr: dmi.product.name: HP Compaq 6715s (RU655ET#AK8) dmi.product.version: F.0E dmi.sys.vendor: Hewlett-Packard To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1590154/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
