https://bugzilla.kernel.org/show_bug.cgi?id=15182
Chris Bagwell <ch...@cnpbagwell.com> changed:
What |Removed |Added
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CC| |ch...@cnpbagwell.com
--- Comment #33 from Chris Bagwell <ch...@cnpbagwell.com> 2010-04-14 16:58:35
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I have same basic issues with non-linear setting of backlight on 1005PE. Here
is some information I found related to it.
I've upgraded to both 0901 and 1003 firmware. With both of those, the Fn-keys
for dimming work as expected on default boot into linux 2.6.33 (Fedora 13 beta
kernel). I pretty much upgraded to this firmware from initial purchase so I
can't report on behavior of Fn-keys before upgrade.
In default linux boot case, eeepc-laptop is not loaded because of WMI feature
for Windows 2009 in DSDT mentioned above. During this boot, any software based
controls of backlight work non-linearly. Also gnome-power-manager gets
confused and keeps undo-ing any changes made by Fn-keys and also doesn't give
that visual percentage bar feedback.
If I boot with acpi_osi="!Windows 2009" or acpi_osi="Linux" then eepc-laptop
loads. In both cases it prints out a message about ACPI controls backlight and
then disable its own support for that. gnome-power-manager still has same
issues mentioned above.
Finally, if I boot with acpi_osi="!Windows 2009" and acpi_backlight=vendor then
all starts to work as expected. Both Fn-keys work nicely and software based
controls also work nicely (as well as getting visual percentage bar feedback in
Gnome when its changing). The highest brightness setting doesn't seem as high
as Windows but that could be based on darker background image on Linux.
Based on review of eeepc-wmi.c, I think it will have same issue because it will
disable backlight support since ACPI claims its during acpi_osi="Windows 2009".
So when given a chance, eeepc-laptop works OK. Probably this means fixes (if
any) will be in acpi-video area?
This issue sounds very similar to bug report id=15532 .
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