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Bug#692436: asus-laptop; ACPI HWRS method takes 12 sconds on UL30A



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.

-- 
Ben Hutchings
The program is absolutely right; therefore, the computer must be wrong.

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