From mboxrd@z Thu Jan 1 00:00:00 1970 From: Richard Purdie Subject: Re: no backlight on radeon after recent kernel "upgrade"s Date: Thu, 22 Feb 2007 00:34:31 +0000 Message-ID: <1172104471.5790.57.camel@localhost.localdomain> References: <20070219044616.GC25659@washoe.onerussian.com> <20070219000412.acad13de.akpm@linux-foundation.org> <1171876788.6046.3.camel@localhost.localdomain> <20070221055648.GM25659@washoe.onerussian.com> Reply-To: linux-fbdev-devel@lists.sourceforge.net Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from sc8-sf-mx2-b.sourceforge.net ([10.3.1.92] helo=mail.sourceforge.net) by sc8-sf-list1-new.sourceforge.net with esmtp (Exim 4.43) id 1HK1v4-0007zO-7a for linux-fbdev-devel@lists.sourceforge.net; Wed, 21 Feb 2007 16:34:46 -0800 Received: from tim.rpsys.net ([194.106.48.114] ident=0) by mail.sourceforge.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.44) id 1HK1v3-0002kg-Hl for linux-fbdev-devel@lists.sourceforge.net; Wed, 21 Feb 2007 16:34:46 -0800 In-Reply-To: <20070221055648.GM25659@washoe.onerussian.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-fbdev-devel-bounces@lists.sourceforge.net Errors-To: linux-fbdev-devel-bounces@lists.sourceforge.net To: Yaroslav Halchenko , James Simmons Cc: Andrew Morton , linux-fbdev-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org On Wed, 2007-02-21 at 00:56 -0500, Yaroslav Halchenko wrote: > I didn't mention 2.6.20-mm1 and got to see -mm2 so it is the one which > Iv'e tried, but, once again, I experienced the same issue with 19-mm? > kernels. > > I built 2.6.20-mm2 without backlight support > $> grep BACKLIGH /boot/config-2.6.20-mm2 > # CONFIG_BACKLIGHT_LCD_SUPPORT is not set > # CONFIG_FB_BACKLIGHT is not set > # CONFIG_FB_RIVA_BACKLIGHT is not set > # CONFIG_FB_RADEON_BACKLIGHT is not set > > that "eliminated" the problem. Also I can see the screen with pure > 2.6.20 with backlight support (whatever it does since after > loading lcd, backlight modules, my /sys/class/{lcd,backlight} are empty): > > *$> grep BACKLIGH /boot/config-2.6.20 > # CONFIG_FB_BACKLIGHT is not set > CONFIG_BACKLIGHT_LCD_SUPPORT=y > CONFIG_BACKLIGHT_CLASS_DEVICE=m > CONFIG_BACKLIGHT_DEVICE=y > > > > Also, do you normally see files under /sys/class/lcd? > nope... after I load lcd module, no files under :-/ regardless either it > is mm or not. But there are files under /sys/class/backlight/ for mm2 > compiled with backlight support (whenever the screen is dark as per my > original email) There should be no files appearing under /sys/class/lcd, so thats all normal. There is another report with similar symptoms which also sounds like enabling the following options are at fault: # CONFIG_FB_RIVA_BACKLIGHT is not set # CONFIG_FB_RADEON_BACKLIGHT is not set I suspect these options only work on certain hardware and aren't generic. James, any idea what hardware these do/don't work with? Worst case, we set them to depend on PMAC_BACKLIGHT again I guess... Richard ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV