On 29 July 2014 15:28, Aaron Lu <aaron.lu@xxxxxxxxx> wrote:
> Please attach acpidump to the Ubuntu bug page.
I installed acpidump from the Ubuntu Software Centre and tried running
it with the following result:
sudo acpidump -z
Intel ACPI Component Architecture
ACPI Binary Table Dump Utility version 20140214-64 [Mar 29 2014]
Copyright (c) 2000 - 2014 Intel Corporation
Cannot map /dev/mem
Could not map table at 0x00000000000F0030 length FEDA0000
Could not get ACPI tables, AE_ACCESS
I'm out of my depth with this. However, with Google's help I found
https://www.kernel.org/doc/Documentation/acpi/initrd_table_override.txt
at the end of which it says:
"Alternatively, used ACPI tables can be retrieved via sysfs in latest
kernels: /sys/firmware/acpi/tables"
Using this hint I've saved the binary files from sysfs and then used
"acpidump -f filename" to create the file I've uploaded to the Ubuntu
bug. Please advise if I need to follow some other procedure to get
what you want.
> BTW, do you always have this problem or it starts to occur
> from some kernel version?
While triaging the bug on Ubuntu we've gone as far back as Ubuntu
12.04.0 (Precise) which is what I first installed on the computer in
question. It's been present in all versions we tested.
> Please also list your /sys/class/backlight with v3.16-rc kernel.
I trust this is what you require:
ls -l /sys/class/backlight
total 0
lrwxrwxrwx 1 root root 0 Jul 29 17:06 acpi_video0 ->
../../devices/pci0000:00/0000:00:02.0/backlight/acpi_video0
lrwxrwxrwx 1 root root 0 Jul 29 17:06 intel_backlight ->
../../devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight
lrwxrwxrwx 1 root root 0 Jul 29 17:06 toshiba ->
../../devices/LNXSYSTM:00/LNXSYBUS:00/TOS6208:00/backlight/toshiba
/sys/class/backlight/acpi_video0/* {cat or ls -l}
actual_brightness: 7
bl_power: 0
brightness: 7
device -> ../../../0000:00:02.0
max_brightness: 7
power/async: disabled
power/autosuspend_delay_ms - Input/output error
power/control: auto
power/runtime_active_kids: 0
power/runtime_active_time: 0
power/runtime_enabled: disabled
power/runtime_status: unsupported
power/runtime_suspended_time: 0
power/runtime_usage: 0
subsystem -> ../../../../../class/backlight
type: firmware
uevent:
/sys/class/backlight/intel_backlight/* {cat or ls -l}
actual_brightness: 249
bl_power: 0
brightness: 249
device -> ../../card0-LVDS-1
max_brightness: 4539
power/async: disabled
power/autosuspend_delay_ms - Input/output error
power/control: auto
power/runtime_active_kids: 0
power/runtime_active_time: 0
power/runtime_enabled: disabled
power/runtime_status: unsupported
power/runtime_suspended_time: 0
power/runtime_usage: 0
subsystem -> ../../../../../../../class/backlight
type: raw
uevent:
/sys/class/backlight/toshiba/* {cat or ls -l}
actual_brightness: 7
bl_power: 0
brightness: 7
device -> ../../../TOS6208:00
max_brightness: 7
power/async: disabled
power/autosuspend_delay_ms - Input/output error
power/control: auto
power/runtime_active_kids: 0
power/runtime_active_time: 0
power/runtime_enabled: disabled
power/runtime_status: unsupported
power/runtime_suspended_time: 0
power/runtime_usage: 0
subsystem -> ../../../../../../class/backlight
type: platform
uevent:
Thank you for your help. John
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