Bug#692436: asus-laptop; ACPI HWRS method takes 12 sconds on UL30A
Hi,
On Wed, Nov 7, 2012 at 1:58 AM, Ben Hutchings <ben@decadent.org.uk> wrote:
> This regression was reported following an upgrade from 3.2.23 to 3.2.32.
>
> On Tue, 2012-11-06 at 01:31 -0800, ryan wrote:
>> Package: src:linux
>> Version: 3.2.32-1
>> Severity: normal
>>
>> Dear Maintainer,
>>
>> After an update to linux-image-3.2.0-4-amd64 from linux-image-3.2.0-3-amd64, I noticed boots were taking longer.
>> I saw "Waiting for /dev to be fully populated", so I disabled quiet boot...
>> I saw loading the module asus_laptop (asus-laptop.ko) was taking well over 11 seconds.
>> I tried booting my prior kernel 3.2.0-3-amd64 (3.2.23-1), and it was rapid, with no pause at all:
>> Nov 5 22:33:12 lt kernel: [ 1.907061] input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input3
>> Nov 5 22:33:12 lt kernel: [ 1.907156] ACPI: Power Button [PWRF]
>> Nov 5 22:33:12 lt kernel: [ 1.912961] ACPI: AC Adapter [AC0] (on-line)
>> Nov 5 22:33:12 lt kernel: [ 1.913853] usbcore: registered new interface driver usbfs
>> Nov 5 22:33:12 lt kernel: [ 1.913959] usbcore: registered new interface driver hub
>> Nov 5 22:33:12 lt kernel: [ 1.919356] [drm] Initialized drm 1.1.0 20060810
>> Nov 5 22:33:12 lt kernel: [ 1.921039] asus_laptop: Asus Laptop Support version 0.42
>> Nov 5 22:33:12 lt kernel: [ 1.921330] asus_laptop: UL30A model detected
>> Nov 5 22:33:12 lt kernel: [ 1.922105] asus_laptop: Backlight controlled by ACPI video driver
>> Nov 5 22:33:12 lt kernel: [ 1.922265] input: Asus Laptop extra buttons as /devices/platform/asus_laptop/input/input4
>> Nov 5 22:33:12 lt kernel: [ 1.932089] usbcore: registered new device driver usb
> [...]
>
> With the new version the result is:
>
>> [ 49.212691] asus_laptop: Asus Laptop Support version 0.42
>> [ 49.213050] asus_laptop: UL30A model detected
>> [ 61.516586] asus_laptop: HWRS returned 80
>> [ 140.393870] asus_laptop: Backlight controlled by ACPI video driver
>> [ 140.394023] input: Asus Laptop extra button as /devices/platform/asus_laptop/input/input11
> [...]
>
> This is presumably due to fixing the typo in the name 'HWRS'. Seems
> like a BIOS bug, but is there anything that can be done about it? Would
> it make sense to restrict which models this method is used on?
>
> Ben.
Hum, we can safely remove this call if it can cause that kind of issue.
Could you cook a patch removing HWRS call on startup end si it to
platform-x86 and stable ? I'll be happy to ack it.
Thanks,
--
Corentin Chary
http://xf.iksaif.net
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