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Can't get full framebuffer res on PS3 [SOLVED]
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Twist
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Joined: 03 Jan 2003
Posts: 414
Location: San Diego

PostPosted: Wed Feb 27, 2008 9:18 pm    Post subject: Can't get full framebuffer res on PS3 [SOLVED] Reply with quote

This is starting to drive me batty.

I have PS3 Gentoo installed, working fine. I have the cell overlay, not that it matters. My problem is that while Gentoo is convinced I am displaying 1920x1080, I am not.

My monitor is capable of 1920x1080 (it's a BenQ FQ241W). I can display either 1920x1200 or 1920x1080 via DVI or using the PS3 in game mode, works fine.

However when I run Gentoo, the display is cropped on all sides (not just top and bottom as might be expected). Further, parts of the display are clearly "there" in an X sense, but are off the screen. For instance, a menu bar will be in a cropped section, but I can go and grab it with my mouse pointer and drag it into the viewable area.

My kboot.conf fb string reads: "video=ps3fb:mode:165 rhgb". Mode "5" works fine but of course is intentionally cropped from full resolution. I have also tried mode "133" (which should be 1080p + full screen, 5 + 128). I have tried increasing/fiddling with the framebuffer memory size via ps3fb=??M but it makes no difference in behavior.

X is convinced it is in fact running 1920x1080, as xdpyinfo shows "1920x1080 pixels (650x366 millimeters)". This makes sense given the symptoms (some display area is there and usable in an X sense, but isn't actually shown).

My monitor is definitely in 1:1 pixel mode. Again, PS3 game mode works just fine, with only expected slight cropping at top and bottom due to the monitor being 1920x1200 and the actual displayed area being 1920x1080.

Relevant portion of the Xorg.log:
(--) FBDEV(0): Virtual size is 1920x1080 (pitch 1920)

Has anybody gotten this working? I know that is *can* work in a general sense, as I've read somone with yellow dog running my exact monitor with a PS3 an getting full frame 1920x1080.

-Twist


Last edited by Twist on Wed Feb 27, 2008 10:05 pm; edited 1 time in total
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Twist
Guru
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Joined: 03 Jan 2003
Posts: 414
Location: San Diego

PostPosted: Wed Feb 27, 2008 10:05 pm    Post subject: Reply with quote

Update: This is a hardware problem!

When testing the game side of display from the PS3, I had been using an HDMI->DVI-D cable, which worked at 1920x1080 fine. When going to PS3 Gentoo, I was using HDMI<->HDMI directly. It turns out there is a firmware flaw in the display that prevents it from working properly at 1:1 pixel ratio in 1920x1080 off HDMI. Sadly the solution appears to be send the monitor away for a firmware upgrade, it's not considered user serviceable. What a completely non functional approach to hardware, ship something specified to have a certain capability and then not have it at all.

I will probably just get a DVI-D switchbox instead, but mystery solved for now.

-Twist
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corsair
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Joined: 06 Oct 2003
Posts: 451
Location: Aachen, Germany

PostPosted: Fri Feb 29, 2008 7:30 am    Post subject: Reply with quote

I've had the exact same problem. this feature is called 'overscan'. take a look here for more information: http://pixelmapping.wikispaces.com/
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