Am 31.01.2011 um 21:39 schrieb "Rafael J. Wysocki" <rjw@xxxxxxx>: > On Friday, January 28, 2011, Thomas Meyer wrote: >> Am Samstag, den 22.01.2011, 20:43 +0100 schrieb Rafael J. Wysocki: >>> On Saturday, January 22, 2011, Thomas Meyer wrote: >>>> with 2.6.38-rc2 the acpi backlight is gone: >>>> >>>> any ideas? >>> >>> Not really, but Matthew may have some (CCed). >> >> Okay, found the problem. >> >> This commit broke my backlight: >> >> commit 677bd810eedce61edf15452491781ff046b92edc >> Author: Zhang Rui <rui.zhang@xxxxxxxxx> >> Date: Mon Dec 6 15:04:21 2010 +0800 >> >> ACPI video: remove output switching control >> >> This is because in function >> "acpi_is_video_device()" (drivers/acpi/video_detect.c) the backlight >> device is only checked when some video capabilities were found, but by >> removing the check for the VIDEO_OUTPUT_SWITCHING (that seems to be the >> only video capability on my system) the check for the backlight device >> isn't done anymore. >> >> by reverting above commit, the backlight is back again. > > Is it the same issue as https://bugzilla.kernel.org/show_bug.cgi?id=27702 ? Yes, it is. > In case it is, can you test the patch in there, please? > Didn't test the patch. But it should do the trick. > Rafael -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
