try this: open terminal and type code: "sudo nano /etc/kboot.conf"
without quote marks, this will open kboot.conf file for editing. then
look for this line or one similar: "linux="/boot/vmlinux
initrd=/boot/initrd.img" in the following space between the g and root
type: video=ps3fb:mode:0  to change resolution automatically. other wise
use this chart for your resolution, refresh, and color type: Video mode
ID:

0:automode
YUV 60Hz 1:480i 2:480p 3:720p 4:1080i 5:1080p
YUV 50Hz 6:576i 7:576p 8:720p 9:1080i 10:1080p
RGB 60Hz 33:480i 34:480p 35:720p 36:1080i 37:1080p
RGB 50Hz 38:576i 39:576p 40:720p 41:1080i 42:1080p
VESA 11:WXGA 12:SXGA 13:WUXGA

full screen mode: <video mode ID> + 128
dither ON mode : <video mode ID> + 2048

So 720p for example: linux="/boot/vmlinux initrd=/boot/initrd.img 
video=ps3fb:mode3 root...."
everything after root is decided by your setup config(when you installed onto 
ps3 in the first place)
then press control+o which will write out and save the file just hit enter and 
type exit and of course restart. once your ps3 turns on it should work semi 
perfect though your resolution might be [EMAIL PROTECTED] it looks just as good 
and lots better then 480i, if anyone doubts me: this works for me and i'm a 
novice linux user, no in fact below that. the first time using linux was when i 
put ubuntu on my ps3 which was today. anymore ?'s please feel free to email 
[EMAIL PROTECTED] Thanks for reading.

-- 
unable to change screen resolution, currently using a 50" hdtv hooked to a ps3 
runnin ubuntu
https://bugs.launchpad.net/bugs/122740
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