Arch Linux

rettahs

Member

Registered: 2009-07-07

Posts: 1

Enabling KMS stops Fn brightness keys from being interpreted

(I'm using 2.6.31-rc2 from git)

When I turn on KMS for i915, Fn-Up/Down don't work. Like, at ALL.

If KMS is off, they work fine.

I can adjust the brightness just fine via the /proc or /sys interfaces both ways.

xev doesn't even acknowledge the keys being pressed.

Any ideas?

Barghest

Member

From: Hanau/Germany

Registered: 2008-01-03

Posts: 563

Re: Enabling KMS stops Fn brightness keys from being interpreted

No idea, but the same issue

When using xbacklight I get the message:

No outputs have backlight property

Last edited by Barghest (2009-07-11 12:53:05)

combuster

Member

From: Serbia

Registered: 2008-09-30

Posts: 711

Website

Re: Enabling KMS stops Fn brightness keys from being interpreted

OSD for brightness pops up but it doesn't change the brightness level...

madalu

Member

Registered: 2009-05-05

Posts: 217

Re: Enabling KMS stops Fn brightness keys from being interpreted

Same problem here on a Macbook 4,1. Had to disable KMS to get
brightness keys to work.

makimaki

Member

From: Ireland

Registered: 2009-04-02

Posts: 109

Re: Enabling KMS stops Fn brightness keys from being interpreted

No idea, but the same issue

When using xbacklight I get the message:

No outputs have backlight property

HI Barghest,

I have an NC10 too, and my workaround was to write two bash scripts that toggle up and down the brightness with setpci, using a hex converter (dc from the bc package).

The scripts are here:
http://bbs.archlinux.org/viewtopic.php?id=74914

---

====* -- Joke
    O
    \|/ --- Me
    / \             Whooooosh

Barghest

Member

From: Hanau/Germany

Registered: 2008-01-03

Posts: 563

Re: Enabling KMS stops Fn brightness keys from being interpreted

Thanks for this makimaki.

Sad that I've already switched back to "KMS off". With KMS xrandr --panning 1024x768 didn't work correctly. Scrolling up on the screen sometimes didn't bring back the whole screen, so that the upper taskbar wasn't visible.

I just tried out KMS because of this bug: https://bugs.launchpad.net/ubuntu/+sour … bug/394490 and I wanted to see, if this is affected by KMS. I don't know: Should I file a bug report for Arch, too?

Nepherte

Member

From: Singapore

Registered: 2008-09-09

Posts: 427

Re: Enabling KMS stops Fn brightness keys from being interpreted

Adding acpi_backlight=vendor as a kernel parameter on boot solved the issue for me. There's also another topic about this problem floating around.