linux-kernel - Re: regression 2.6.37 -> 2.6.38-rc1: after suspend backlight cannot be adjusted

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Date:	Fri, 21 Jan 2011 17:26:02 +0900
From:	Norbert Preining <preining@...ic.at>
To:	Zhang Rui <rui.zhang@...el.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	ACPI Devel Mailing List <linux-acpi@...r.kernel.org>
Subject: Re: regression 2.6.37 -> 2.6.38-rc1: after suspend backlight
	cannot be adjusted

On Fr, 21 Jan 2011, Zhang Rui wrote:
> does changing /sys/class/backlight/acpi_video0/brightness work for you?

Interestingly, that is gone since 2.6.37.

A diff of the dmesg between 37 and 38-rc1 (+up to  git 8d99641f6c1a)
shows (besides other things):
(no idea if that is important)
-Switching to clocksource tsc
+Switching to clocksource hpet

and here it is:
-acpi device:01: registered as cooling_device2
-input: Video Bus as /devices/LNXSYSTM:00/device:00/PNP0A08:00/LNXVIDEO:00/input/input2
-ACPI: Video Device [OVGA] (multi-head: yes  rom: no  post: no)
+No ACPI video bus found

(also the cooling_device2 is gone)

Interestingly, adjustment via sony-laptop does work, but only 
at first boot, not after suspend?!?!

> btw, please attach the acpidump of this laptop.

Attached, in gzip.

Best

Norbert
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Norbert Preining            preining@...ist.ac.jp, logic.at, debian.org}
JAIST, Japan                                 TeX Live & Debian Developer
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