Re: Linux 2.6.12-rc2

[Benjamin Herrenschmidt <benh@kernel.crashing.org>]

On Thu, 2005-04-07 at 11:54 -0700, Nish Aravamudan wrote:
> On Apr 7, 2005 10:50 AM, Moritz Muehlenhoff <jmm@inutil.org> wrote:
> > Benjamin Herrenschmidt wrote:
> > > > 1. When resuming from S3 suspend and having switched off the backlight
> > > > with radeontool the backlight isn't switched back on any more.
> > >
> > > I'm not sure what's up here, it's a nasty issue with backlight. Can
> > > radeontool bring it back ?
> > 
> > Before suspending I power down the backlight with "radeontool light off"
> > and with 2.6.11 the display is properly restored. With 2.6.12rc2 the
> > backlight remains switched off and if I switch it on with radeontool it
> > becomes lighter, but there's still no text from the fbcon, just the blank
> > screen.
> 
> FWIW, I have the same problem on a T41p with 2.6.11 and 2.6.12-rc2,
> except that neither returns from suspend-to-ram with video restored on
> the LCD. I believe I was able to get video restored on an external CRT
> in either 2.6.12-rc2 or 2.6.12-rc2-mm1, but the LCD still didn't
> restore (can verify later today, if you'd like). I had dumped out the
> radeontool regs values before & after the sleep, in case they help.
> They are attached.
> 
> I posted these problems in the "Call for help S3" thread, but no one responded.

I would say the different value in LVDS_GEN_CNTL explains it. I'll see
if I can force radeonfb to save/restore this.

Ben.