6.14.4 driver hanging w/ Radeon HD 7660G GPU

[criego duncan]

I just got a new HP Pavilion dv6 laptop with an AMD A10-4600M APU (which 
contains the Radeon HD 7660G GPU).

I read that the 3.4 kernel now supports Trinity, so i tried it 
(installed the 3.4-trunk-amd64 from debian) but the first problem was 
that the Xorg.log told me that kernel modesetting was required.  I have 
"/etc/modprobe.d/radeon-kms.conf" which contains: options radeon modeset=1

This didn't turn it on, though, so i added it to grub and now X just 
hangs in an uninterruptable sleep state.

I think this may be an issue with h/w not quite completely supported yet 
and if so, i'll be happy to do whatever i can to troubleshoot the problem.
I loaded the debian packages: xserver-xorg-core-dbg (1.12.1.902-1) & 
xserver-xorg-video-radeon-dbg (6.14.4-5) and ran gdb but it just hung 
while attaching to X (of course).

I also have a problem that when i boot into 3.4 the laptop screen goes 
dark while booting (right after doing a modprobe of some sort, i think). 
  I ssh in and everything is working fine, but the screen doesn't work.

_______________________________________

Forgot to add this info:

X.Org X Server 1.12.1.902 (1.12.2 RC 2)
Release Date: 2012-05-19
[   241.707] X Protocol Version 11, Revision 0
[   241.707] Build Operating System: Linux 3.2.0-2-amd64 x86_64 Debian
[   241.707] Current Operating System: Linux hplap 3.4-trunk-amd64 #1 
SMP Tue Jun 26 17:23:03 UTC 2012 x86_64
[   241.707] Kernel command line: 
BOOT_IMAGE=/boot/vmlinuz-3.4-trunk-amd64 
root=UUID=3e045c90-520c-47f9-84fb-7c5cf76a0485 ro ra$
[   241.707] Build Date: 20 May 2012  08:57:17AM
[   241.707] xorg-server 2:1.12.1.902-1 (Cyril Brulebois <kibi at debian.org>)
[   241.707] Current version of pixman: 0.26.0

<snip>

         ARUBA, ARUBA, ARUBA, ARUBA
[   242.540] (--) using VT number 8

[   242.551] (II) [KMS] Kernel modesetting enabled.
[   242.551] (II) RADEON(0): Creating default Display subsection in 
Screen section
         "Default Screen Section" for depth/fbbpp 24/32
[   242.551] (==) RADEON(0): Depth 24, (--) framebuffer bpp 32
[   242.552] (II) RADEON(0): Pixel depth = 24 bits stored in 4 bytes (32 
bpp pixmaps)
[   242.552] (==) RADEON(0): Default visual is TrueColor
[   242.552] (==) RADEON(0): RGB weight 888
[   242.552] (II) RADEON(0): Using 8 bits per RGB (8 bit DAC)
[   242.552] (--) RADEON(0): Chipset: "ARUBA" (ChipID = 0x9900)
[   242.552] (II) RADEON(0): PCIE card detected
[   242.552] drmOpenDevice: node name is /dev/dri/card0

and that's where it hung