Laurent Bonnaud, thank you for reporting this and helping make Ubuntu better. As per your https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1264346/+attachment/3936150/+files/BootDmesg.txt : [ 0.000000] ACPI BIOS Warning (bug): 32/64X FACS address mismatch in FADT - 0xCABD4E40/0x00000000CABD4D40, using 32 (20130517/tbfadt-522) ... [ 0.062613] perf_event_intel: PEBS disabled due to CPU errata, please upgrade microcode ... [ 0.113838] [Firmware Bug]: ACPI: BIOS _OSI(Linux) query ignored ... [ 1.833400] [drm] Wrong MCH_SSKPD value: 0x16040307 [ 1.833403] [drm] This can cause pipe underruns and display issues. [ 1.833404] [drm] Please upgrade your BIOS to fix this.
Hence, as per http://www.dell.com/support/drivers/us/en/19/Product/latitude-e6520 an update is available for your BIOS (A19). If you update to this following https://help.ubuntu.com/community/BiosUpdate , does it change anything? If it doesn't, could you please both specify what happened, and just provide the output of the following terminal command: sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date Please note your current BIOS is already in the Bug Description, so posting this on the old BIOS would not be helpful. For more on BIOS updates and linux, please see https://help.ubuntu.com/community/ReportingBugs#Bug_reporting_etiquette . Thank you for your understanding. ** Changed in: linux (Ubuntu) Importance: Undecided => Medium ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete ** Summary changed: - machine very slow with ondemand governor + [Dell Latitude E6520] After suspend, machine very slow with ondemand governor -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1264346 Title: [Dell Latitude E6520] After suspend, machine very slow with ondemand governor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1264346/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
