[Solved] Dell D520 DMA

Question

Hi, decided to install arch on my laptop, and finally took my time to do it.
I've built a custom kernel but I cant get DMA to work, any suggestions to what I should enable?
Kernel I am trying to build is 2.6.23.1. I'm using a D520 laptop from Dell, lspci: http://pastebin.com/m1620c248
I am not sure if these will help, but better with more info then no info;
dmesg: http://pastebin.com/m537e3423
.config (note, bloated currently): http://pastebin.com/m2864a860
This isnt about the DVD/CD-rom DMA as most google-results is about.
Thanks in advance.
Edit:
I think this subject has been solved, cant say for 100% though.
For future reference, this works but cant verify that its not bloated (written of from another computer, spelling errors might occur):
Device Drivers --->
< > ATA/ATAPI/MFM/RLL support --->
SCSI device support --->
<*> SCSI disk support
<*> SCSI generic support
<*> Serial ATA (prod) and Parallel ATA (experimental) drivers --->
<*> AHCI SATA support
<*> VIA SATA support
<*> Generic ATA support
<*> Intel PATA MPIIX support
<*> Intel PATA old PIIX support
<*> SiS PATA support (Experimental)
<*> VIA PATA support
Feedback to making this more slim is appreciated.
Last edited by biio (2007-10-20 04:09:31)

Answer 1

WonderWoofy wrote:... I think this was probably indicative of the systemd-tmpfiles.service being sometimes run before thes particular directories were created.  So I ended up creating a udev rule in order to ensure that the value would be written to the file whenever the backlight stuff in /sys was actually set up...
Thanks for your help,I got that by adding udev rules.
udevadm info -a -p /sys/class/backlight/intel_backlight
Udevadm info starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.
looking at device '/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight':
KERNEL=="intel_backlight"
SUBSYSTEM=="backlight"
DRIVER==""
ATTR{type}=="raw"
ATTR{brightness}=="10"
ATTR{bl_power}=="0"
ATTR{max_brightness}=="4882"
ATTR{actual_brightness}=="10"
rule looks like this:
cat /etc/udev/rules.d/40-brightness.rules
ACTION=="add", KERNEL=="intel_backlight", SUBSYSTEM=="backlight", ATTR{brightness}="10"
Last edited by czheji (2013-07-29 14:55:17)