[ltp] Re: [ibm-acpi-devel] thinkpad-acpi release 0.17-20071002 uploaded to ibm-acpi.sf.net

[Chris Hanson]

Henrique de Moraes Holschuh wrote:
> Can't reproduce this on 2.6.22 and a T43.  Given that the driver returns
> EINVAL well before it even tries to poke the hardware, it should not make a
> difference which thinkpad we try it on.  So, that leaves us with
> thinkpad-acpi bugs, or a backlight class bug.  Which kernel version?

2.6.22.9 + numerous patches: whoopie patches; deferrable timers; round
jiffies; ALPM; HRT.

> Also, just to be sure, cat
> /sys/class/backlight/thinkpad_screen/max_brightness returns 7 in your T60,
> correct?

Correct.

> Should be impossible to happen as long as max_brightness is not 15 (not only
> because of the backlight class, but also because it means thinkpad-acpi is
> supposed to refuse to write such stuff to the hardware).  But a backlight
> variable being stuck is not at all difficult to imagine.  Let's try to track
> it down...

OK, what else do you need?