Hey everyone. I am running Ubuntu 9.04 64-bit on my macbook. I had 2GB of ram before, and everything ran great. I just upgraded to 2x2GB (4GB), but my system only sees 3GB of it. OS X, which I am dual booting, sees all 4GB. Also, my video performance is incredibly lacking. Before the upgrade my compiz benchmark was full at 80fps, and now it is at 22fps with very choppy window dragging.

Has anyone ever heard of this on a 64-bit kernel? I just don't quite understand what could be the issue.

10$ uname -a
Linux macbook 2.6.28-15-generic #49-Ubuntu SMP Tue Aug 18 19:25:34 UTC 2009 x86_64 GNU/Linux

$ free -m
             total       used       free     shared    buffers     cached
Mem:          2953       1031       1921          0        114        427
-/+ buffers/cache:        489       2463
Swap:         7812          0       7812

9$ lsmod
Module                  Size  Used by
i915                   77960  2 
drm                   123232  3 i915
binfmt_misc            18572  1 
ppdev                  16904  0 
btusb                  21784  2 
bridge                 63776  0 
stp                    11140  1 bridge
bnep                   22912  2 
vboxnetadp            109356  0 
vboxnetflt            116972  0 
vboxdrv              1721612  1 vboxnetflt
uvcvideo               69640  0 
compat_ioctl32         18304  1 uvcvideo
videodev               45184  2 uvcvideo,compat_ioctl32
v4l1_compat            23940  2 uvcvideo,videodev
lp                     19588  0 
parport                49584  2 ppdev,lp
snd_hda_intel         557492  3 
snd_pcm_oss            52352  0 
snd_mixer_oss          24960  1 snd_pcm_oss
snd_pcm                99464  2 snd_hda_intel,snd_pcm_oss
arc4                   10240  2 
snd_seq_dummy          11524  0 
ecb                    11392  2 
snd_seq_oss            41984  0 
snd_seq_midi           15744  0 
snd_rawmidi            33920  1 snd_seq_midi
snd_seq_midi_event     16512  2 snd_seq_oss,snd_seq_midi
snd_seq                66272  6 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_seq_midi_event
ath9k                 310584  0 
snd_timer              34064  2 snd_pcm,snd_seq
snd_seq_device         16276  5 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_rawmidi,snd_seq
mac80211              251528  1 ath9k
iTCO_wdt               21712  0 
iTCO_vendor_support    12420  1 iTCO_wdt
joydev                 20992  0 
video                  29204  0 
snd                    78920  15 snd_hda_intel,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_seq_oss,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
applesmc               37700  0 
output                 11648  1 video
soundcore              16800  1 snd
pcspkr                 11136  0 
cfg80211               43680  1 mac80211
appletouch             19972  0 
isight_firmware        11520  0 
input_polldev          12688  1 applesmc
intel_agp              39408  1 
snd_page_alloc         18704  2 snd_hda_intel,snd_pcm
led_class              13064  2 ath9k,applesmc
hid_apple              15872  0 
usbhid                 47040  0 
ohci1394               42164  0 
ieee1394              108288  1 ohci1394
sky2                   63364  0 
fbcon                  49792  0 
tileblit               11264  1 fbcon
font                   17024  1 fbcon
bitblit                14464  1 fbcon
softcursor             10368  1 bitblit

Some information from dmesg:

[  795.820163] ACPI: EC: GPE storm detected, transactions will use polling mode
[ 1762.709516] [drm:i915_getparam] *ERROR* Unknown parameter 6
[ 1763.078130] [drm:i915_getparam] *ERROR* Unknown parameter 6
[ 2362.760889] [drm:i915_getparam] *ERROR* Unknown parameter 6
[ 2416.352084] ACPI: EC: missing confirmations, switch off interrupt mode.
[ 3718.721095] [drm:i915_getparam] *ERROR* Unknown parameter 6
[ 3719.108914] [drm:i915_getparam] *ERROR* Unknown parameter 6
[ 4318.773266] [drm:i915_getparam] *ERROR* Unknown parameter 6
[ 9513.813066] CE: hpet increasing min_delta_ns to 15000 nsec
[ 9693.815684] npviewer.bin[6736]