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Date: Mon, 13 Apr 2009 17:16:42 +0200 From: Niel Lambrechts <niel.lambrechts@...il.com> To: yakui_zhao <yakui.zhao@...el.com> CC: Henrique de Moraes Holschuh <hmh@....eng.br>, Andrew Morton <akpm@...ux-foundation.org>, "linux.kernel" <linux-kernel@...r.kernel.org>, "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>, mjg59@...f.ucam.org Subject: Re: 2.6.30-rc1 (latest git): thinkpad-acpi: cannot control brightness with hotkeys On 04/13/2009 03:21 AM, yakui_zhao wrote: > On Mon, 2009-04-13 at 02:37 +0800, Niel Lambrechts wrote: > >> On 04/12/2009 06:14 PM, Henrique de Moraes Holschuh wrote: >> >>> On Sat, 11 Apr 2009, Andrew Morton wrote: >>> >>> >>>>> With latest git kernel, I'm no longer able to control my Thinkpad (W500) >>>>> brightness, although I can still control the backlight, bluetooth etc. >>>>> >>>>> >>> Niels, something just occourred to me. Is your problem the hotkeys, or the >>> brightness control itself? Check /sys/class/backlight/*, please. What do >>> you have in there? Does it work? >>> >>> >> Hi Henrique, >> > Will you please check whether there exists the /sys/class/backlight/*/*? > I already did mention that the directory does not exist when using 2.6.30 - see down below. The directory only exists when I use 2.6.29.1 or 2.6.28.x, so there is some type of regression. > > If not, will you please load the i915 driver and see whether the > backlight can be controlled by hotkeys?(The CONFIG_DRM_I915_KMS should > be enabled in kernel configuration). > I'm not using modeset=1, as I have even worse results with i915.modeset=1 enabled (freezing system / black screen). So the results I gave was using: Graphics card: Mobile Intel GM45 Express Chipset Option "EXANoComposite" Option "AccelMethod" "exa" Option "MigrationHeuristic" "greedy" Option "ExaNoComposite" "false" Option "VBERestore" "true" > Thanks. > >> The directory is empty - this is when I used 2.6.30-rc1 (latest git) >> from yesterday. I'll keep retrying with the latest git kernels though. >> >> The only additional observations I can provide is: >> 1) pulling/plugging the power cord does actually have an effect on the >> brightness. >> 2) resuming form hibernate - Xorg is blank, until I simultaneously press >> a keyboard key and touch the synaptics pad. But I have this problem in >> 2.6.28/2.6.29 as well, and I guess it could either be vesafb or ACPI >> related, as it also happened when I used s2disk in a console session >> outside of X. >> >> In 2.6.29.1: >> lrwxrwxrwx 1 root root 0 Apr 12 20:01 /sys/class/backlight/acpi_video0 >> -> ../../devices/virtual/backlight/acpi_video0 >> >> which contains: >> drwxr-xr-x 3 root root 0 Apr 12 20:01 ./ >> drwxr-xr-x 3 root root 0 Apr 12 20:01 ../ >> -r--r--r-- 1 root root 4096 Apr 12 20:02 actual_brightness >> -rw-r--r-- 1 root root 4096 Apr 12 20:02 bl_power >> -rw-r--r-- 1 root root 4096 Apr 12 20:02 brightness >> -r--r--r-- 1 root root 4096 Apr 12 20:01 max_brightness >> drwxr-xr-x 2 root root 0 Apr 12 20:02 power/ >> lrwxrwxrwx 1 root root 0 Apr 12 20:01 subsystem -> >> ../../../../class/backlight/ >> -rw-r--r-- 1 root root 4096 Apr 12 20:01 uevent >> >> max_brightness = 15 and echoing values [0-15] to brightness controls it >> as expected, or just using the standard thinkpad keys (Fn-Home to increase). >> Thanks Niel -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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