2.6.0-test8 backlight and sound problems (PMU) on PPC

2.6.0-test8 backlight and sound problems (PMU) on PPC

[C S Rosenmund]

Hardware is an early iBook (first gen - Clamshell)

with 2.6.0-test8, sound does not recover from sleep when an application 
is using it when the notebook is slept (can be reproduced: using pysol, 
with sound enabled, close the lid to sleep the laptop, then anytime 
after the sound stops (indicating that the laptop is sleeping) open the 
lid. Sound does not return, and the application does not close) The 
symptoms (indicated above) seem to point to the sound module (also when 
compiled into the kernel) hanging up on sleep. Sound hardware is 
pmac-dmasound.

two problems on the backlight (probably related):
the backlight control buttons do not work (the brightness of the 
backlight does not change) and when the laptop goes to sleep, the 
backlight does not turn off (it does turn off for console blanking as in 
when the unit is left idle for some time, and the screen goes blank).

I was unable to find any reference to this in the archives, so I'm not 
sure if this has been noticed yet.

Results of ver_linux:
Linux Blueberry 2.6.0-test8 #10 Tue Oct 21 22:02:41 PDT 2003 ppc GNU/Linux
 
Gnu C                  3.3.2
Gnu make               3.80
util-linux             2.12
mount                  2.12
module-init-tools      0.9.15-pre2
e2fsprogs              1.35-WIP
PPP                    2.4.2b3
nfs-utils              1.0.5
Linux C Library        2.3.2
Dynamic linker (ldd)   2.3.2
Procps                 3.1.12
Net-tools              1.60
Console-tools          0.2.3
Sh-utils               5.0.91
Modules Loaded         dmasound_pmac dmasound_core soundcore
Blueberry:/usr/src/linux-2.6.0-test8/scripts#

do you need more info than this? If so, what?

Sanjay
gnuman@comcast.net

Re: 2.6.0-test8 backlight and sound problems (PMU) on PPC

[Benjamin Herrenschmidt]

On Thu, 2003-10-23 at 00:15, C S Rosenmund wrote:
> Hardware is an early iBook (first gen - Clamshell)

First, please CC me or linuxppc-dev at least on PowerMac related
reports.

> with 2.6.0-test8, sound does not recover from sleep when an application 
> is using it when the notebook is slept (can be reproduced: using pysol, 
> with sound enabled, close the lid to sleep the laptop, then anytime 
> after the sound stops (indicating that the laptop is sleeping) open the 
> lid. Sound does not return, and the application does not close) The 
> symptoms (indicated above) seem to point to the sound module (also when 
> compiled into the kernel) hanging up on sleep. Sound hardware is 
> pmac-dmasound.

Looks like the dbdma channel is stuck. I'll investigate. (Note,
Christoph Hellwig is now maintaining this driver in 2.6, also note
that Linus tree misses some sound bits, you may want to use my
bk tree from bk://ppc.bkbits.net/linuxppc-2.5-benh for now, I hope
to have everything merged upstream by 2.6.1)

> two problems on the backlight (probably related):
> the backlight control buttons do not work (the brightness of the 
> backlight does not change) and when the laptop goes to sleep, the 
> backlight does not turn off (it does turn off for console blanking as in 
> when the unit is left idle for some time, and the screen goes blank).

You aren't using the proper video driver it seems.