Overview: Acer NetBook AO722 freezes shortly after booting (from Power ON), no hardwired network connection but WiFi active; first boot device is HDD0. BUT after making changes in BIOS boot sequence, boots ok (without power off / power on) and does NOT freeze. Same problem confirmed with Kernel 3.2.0-23-generic See Bug report: https://bugs.launchpad.net/bugs/983514 Workaround: change BIOS boot sequence to have 'Network Boot' as FIRST boot device, before HDD0. Network Boot times out then HDD0 boots ok and no freezing thereafter. Steps to Reproduce: a-power on; F2; configure 'Network Boot' as first boot device in BIOS and 'HDD0' as second; F10 b-without power off, reboot; network times out then HDD0 boots ok and no freezing; c-power off then power on; network times out then HDD0 boots ok and no freezing; d-power off then power on; F2; configure 'HDD0' as first boot device in BIOS;F10; e-do NOT power off; just reboot; no freezing; f-repeat step 'e' several times; no freezing; g-power off then power on; boots from HDD0 and freezes. Note: This problem was there in Ubuntu 12.04 since the first alpha I tested.
Created attachment 72956 [details] dmesg output
Created attachment 72957 [details] dmidecode output
Created attachment 72958 [details] lspci -vvnn output
Created attachment 72959 [details] /proc/interrupts output
Created attachment 72960 [details] /proc/mtrr output
Created attachment 72961 [details] ver_linux output
Created attachment 72988 [details] dmesg output when AO722 freezes
Created attachment 72989 [details] dmesg output
Created attachment 72990 [details] dmesg output when AO722 does NOT freeze
Here is a simpler way to reproduce this problem Prerequisites: 1-on battery power; no AC Adapter 2-no wired network connection 3-active WiFi connection 4-power on 5-set BIOS boot sequence: 1 . HDD0 6-power off Test #1: freezes; dmesg output attached file 'dmesg-FREEZE' 1-power on 2-F12 select HDD0 3-boot 4-freezes 5-power off Test #2: OK no freezing; dmesg output attached file 'dmesg-OK' 1-power on 2-F12 select Network 3-boots 4-keeps working 5-shutdown
(In reply to comment #10) > Here is a simpler way to reproduce this problem > ... Hi Aurele, Please help to check does this issue causes by acer-wmi, please add acer-wmi driver to blacklist in /etc/modprobe.d and try to reproduce issue. thanks
Performed test listed on 2012-04-19 19:09:03 COLD BOOT with: Linux AOU1204 3.2.0-29-generic #46-Ubuntu SMP Fri Jul 27 17:03:23 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux Result: identical. performed system update then COLD BOOT with: Linux AOU1204 3.2.0-30-generic #48-Ubuntu SMP Fri Aug 24 16:52:48 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux Result: identical. added blacklist acer-wmi COLD BOOT again; Result: identical. It appears that this problem is not caused by acer-wmi.
Aurele, thanks for your testing (In reply to comment #12) ... > > added blacklist acer-wmi > > COLD BOOT again; > Result: identical. > > It appears that this problem is not caused by acer-wmi. I asked because the system message stop on before acer_wmi load. Per success dmesg on comment#10: ... [ 7.446975] psmouse serio1: synaptics: Touchpad model: 1, fw: 7.2, id: 0x1c0b1, caps: 0xd04733/0xa40000/0xa0000 <=== freeze here [ 7.500828] acer_wmi: Acer Laptop ACPI-WMI Extras [ 7.500875] acer_wmi: Function bitmap for Communication Button: 0x1 [ 7.500889] acer_wmi: Brightness must be controlled by acpi video driver [ 7.529154] input: Acer WMI hotkeys as /devices/virtual/input/input8 [ 7.584031] input: SynPS/2 Synaptics TouchPad as /devices/platform/i8042/serio1/input/input9 Have the following questions: + Does this issue also happen on runlevel 3 ? When system doesn't launch X-window? + Per dmesg log, does it always freeze before acer_wmi load? or it's random freeze on any driver message in dmesg? Thanks