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SubjectRe: Linux 2.6.12-rc2
On Apr 7, 2005 3:45 PM, Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote:
> 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.

Great! That seemed odd to me, as well. I'll be more than happy to try
any patches (I'll take a look at the code tonight myself).

Thanks,
Nish
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