About the missing /proc/acpi/video directory
Looking at
http://lxr.linux.no/linux+v2.6.30/dr.../video.c#L2336 - ACPI Video code as per kernel 2.6.30, where /proc/acpi/video seems to have gone missing (cf. tested 2.6.30 mainline PPA kernel) - explains the disappearance: GMA500 is reported as an Intel VGA device, which prompts the ACPI Video to skip the registration.
The following (quick and dirty) patch solves the issue:
Code:
--- linux-2.6.31/drivers/acpi/video.c.orig 2009-08-13 22:59:13.000000000 +0200
+++ linux-2.6.31/drivers/acpi/video.c 2009-08-13 23:00:06.000000000 +0200
@@ -2391,8 +2391,8 @@
{
dmi_check_system(video_dmi_table);
- if (intel_opregion_present())
- return 0;
+// if (intel_opregion_present())
+// return 0;
return acpi_video_register();
}
The /proc/acpi/video directory then re-appears, and the "IgnoreACPI" option can be removed from /etc/X11/xorg.conf
TO BE CLARIFIED: does this behavior occurs only when using 2.6.31 on 9.04/Jaunty (my setup), or does it also occur in 9.10/Karmic?
Also, once X started, the LCD brightness MUST be modified via XRandR:
Code:
xrandr --output LVDS0 --set BACKLIGHT <value between 0 and 100>
(iow. /proc/acpi/video/GFX0/LCDD/brightness won't work)
Hope this helps
