[Bug 15166] Changing brightness of backlight freezes kernel with radeon kms enabled.

[bugzilla-daemon@bugzilla.kernel.org]

http://bugzilla.kernel.org/show_bug.cgi?id=15166





--- Comment #17 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-02-08 13:32:53 ---
Sorry, that this took so long. I was offline for 2 days.

I guess you mean the Ctrl+Alt+Fn key-combo, because laptops have usually also a
key with the keycode 'SWITCHVIDEOMODE' on a Fn+Fx key-combo.

Well, display switching works fine. Switching from console to X takes ca. 2
seconds. The switchvideomode-key (for me Fn+F4) switches backwards through
consoles from F12 to F1, while there is actually a 13th X interface (this would
be F13) before switching to F12 (/var/log/messages). But maybe it is reserved
for something else. Using Fn+F4 writes also 'p' out to console and X.

Since a comparison with the kernel behaviour of a desktop pc, I know now what
the kernel is trying to do after this time amount of 5 min. in console. It
tries to blank the screen. But with kms enabled, the monitor is instead
switched off and the system freezes. So it´s not necessary to close the lid.
You just have to wait 5 minutes doing nothing. But the LED of the
sound-mute-button is still working then. (in contrast to a system freeze with
lid closed)

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