my powerbook fails to resume if backlight control is disabled

my powerbook fails to resume if backlight control is disabled

[Johannes Berg]

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Can't really tell what's wrong, I had my kernel misconfigured
accidentally and was sitting on a train so I couldn't see if I could
still ssh in. However, it seems that the machine just froze, blindly
switching to vt 1 and rebooting didn't seem to work.

The thing is that I had turned off some options to the point where I
had /sys/class/backlight but nothing in it. I don't know for sure what
exactly these options were, but I do know that CONFIG_PMAC_BACKLIGHT and
CONFIG_PMAC_BACKLIGHT_LEGACY were off, though that alone shouldn't
cause /sys/class/backlight/radeonbl0 to disappear.

I haven't done any further tests so far.

johannes

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Re: my powerbook fails to resume if backlight control is disabled

[Michael Hanselmann]

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Hi Johannes

On Wed, Apr 04, 2007 at 05:20:40PM +0200, Johannes Berg wrote:
> The thing is that I had turned off some options to the point where I
> had /sys/class/backlight but nothing in it. I don't know for sure what
> exactly these options were, but I do know that CONFIG_PMAC_BACKLIGHT and
> CONFIG_PMAC_BACKLIGHT_LEGACY were off, though that alone shouldn't
> cause /sys/class/backlight/radeonbl0 to disappear.

It can:
config FB_RADEON_BACKLIGHT
    bool "Support for backlight control"
    depends on FB_RADEON && PMAC_BACKLIGHT
    […]

Maybe I can try it during the next weekend.

Greets,
Michael

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Re: my powerbook fails to resume if backlight control is disabled

[Michael Hanselmann]

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Hello Johannes

On Wed, Apr 04, 2007 at 05:20:40PM +0200, Johannes Berg wrote:
> The thing is that I had turned off some options to the point where I
> had /sys/class/backlight but nothing in it. I don't know for sure what
> exactly these options were, but I do know that CONFIG_PMAC_BACKLIGHT and
> CONFIG_PMAC_BACKLIGHT_LEGACY were off, though that alone shouldn't
> cause /sys/class/backlight/radeonbl0 to disappear.

I tried a configuration like that and can't reproduce it. Maybe it's
because of some other driver.

Greets,
Michael

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Re: my powerbook fails to resume if backlight control is disabled

[Johannes Berg]

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On Tue, 2007-04-10 at 20:41 +0200, Michael Hanselmann wrote:

> I tried a configuration like that and can't reproduce it. Maybe it's
> because of some other driver.

Alright. I'll ignore it until I run into it again and can reproduce
it :)

johannes

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