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Date: Mon, 19 Feb 2007 09:19:48 +0000 From: Richard Purdie <rpurdie@...ys.net> To: Yaroslav Halchenko <kernel@...russian.com>, Andrew Morton <akpm@...ux-foundation.org> Cc: linux-kernel@...r.kernel.org, linux-fbdev-devel@...ts.sourceforge.net Subject: Re: no backlight on radeon after recent kernel "upgrade"s On Mon, 2007-02-19 at 00:04 -0800, Andrew Morton wrote: > On Sun, 18 Feb 2007 23:46:16 -0500 Yaroslav Halchenko <kernel@...russian.com> wrote: > > Since the most recent successful for me kernel 2.6.19-rc6-mm1, I've > > tried few times to build more recent snapshots and now finally > > 2.6.20-mm2. In all those cases I have a sad outcome -- kernel boots but > > at some point during boot (few moments after Penguin icon in the top left > > corner appears), light turns off... I still can see something, especially > > if I light a strong flashlight at a sharp angle. > > > > I've enabled back-light support and lcd support for those unsuccessful > > kernels (with all backlight support features disabled kernel boots > > ok and backlight shines as bright as always) > > > > All my changes of values for files under > > /sys/class/backlight/radeonbl0 > > had no impact on the screen. Also I had no files under /sys/class/lcd. > > > > Running > > radeontool light off > > caused complete turning off of LCD - I could not see > > anything anymore. > > > > sony's spictl -b had no effect as well. > > > > Config can be found at > > http://www.onerussian.com/Linux/bugs/nobacklight.1/config-2.6.20-mm2 > > lshw > > http://www.onerussian.com/Linux/bugs/nobacklight.1/lshw > > other details are available from > > http://www.onerussian.com/Linux/bugs/nobacklight.1/ > > > > Could you please advise? > > (cc's added) > > Is 2.6.20 broken? I assume the latest 2.6.20-gitN snapshot are failing.. It would be extremely useful to know which kernel versions you tested and which ones failed. There are a number of backlight changes which are just in 2.6.20-mm1 and -mm2 which it would be useful to rule out or identify as the cause. Also, do you normally see files under /sys/class/lcd? Regards, Richard - 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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