The kernel does not create any /proc/acpi/video folder for the nvidia ION chipset. As a consequence, backlight control will not work. For details and a patch vs. vanilla kernel, please refer to the Arch linux forum entry I pasted under URL. Reproducible: Always Steps to Reproduce: 1. Buy Samsung N510 (or other ION netbook) 2. Install gentoo, install nvidia drivers 3. check /proc/acpi/video Actual Results: /proc/acpi/video is empty As a patch seems to already exist, I would be glad if the patchset of gentoo-sources could include this one.
I forgot to mention: This happens both with kernel 2.6.30-r8 as with 2.6.31.r2.
I applied this patch successfully on 2.6.31-r2 kernel tree (but I'v seen that video.c and video_detect.c are equal also in 2.6.30-r8), now backlight control works for me. Obviously I do not know, if this may break something for anyone else.
It also seems that ubuntu karmic already includes this patch in its default kernel. At least on ubuntu karmic the backlight control works, as reported by others.
FWIW - just patched my gentoo-sources 2.6.31-gentoo-r5 with the patch mentioned in the archlinux forum, and now backlight control works with kde 4.3.1. Fn+Up/Dn keys for brightness control don'twork yet, but that's unrelated to this issue.
(In reply to comment #4) > FWIW - just patched my gentoo-sources 2.6.31-gentoo-r5 with the patch mentioned > in the archlinux forum, and now backlight control works with kde 4.3.1. > Fn+Up/Dn keys for brightness control don'twork yet, but that's unrelated to > this issue. > OT: For hints on the function key problems you may try the tips for NC10 in this forum: http://www.voria.org/forum/. I had not yet the time to check it out, though.
Thanks for the pointer to patch for this issue, assigning to kernel team.
We'll keep on eye on this and wait for the fix to make upstream development kernel repository.
It looks like the patch reference is in linux-2.6.32. Can you test with that one and let us know the results.
(In reply to comment #8) > It looks like the patch reference is in linux-2.6.32. Can you test with that > one and let us know the results. > Sorry, I am very short of time in this period. I will try it ASAP.
OK, I finally found the time to test. gentoo-sources-2.6.32-r4 does the job. (probably any 2.6.32 kernel will do). Thanx!
(In reply to comment #10) > OK, I finally found the time to test. gentoo-sources-2.6.32-r4 does the job. > (probably any 2.6.32 kernel will do). Thanx! > PS: To me it's closed then, but I'm not familiar with your habits here so I left it RESOLVED NEEDINFO by now.
