Bug#678621: xserver-xorg-video-radeon: Unable to set native resolution

[Michel Dänzer]

On Sam, 2012-06-23 at 12:57 +0200, Per Blomqvist wrote: 
> 
> After an system update, the radeon -driver doesn’t support 1280x1024
> resolution.

What exactly changed during the system update? In particular, which
version of the kernel and xserver-xorg-video-radeon were you running
before and afterwards?


> Also, maybe another bug though, I tested to change "DefaultDepth        24", to
> 32.

Depth 32 isn't supported by the radeon driver, as it can't make any use
of the additional bits. Depth 24 uses 32 bits of storage for each pixel.


> That apparently froze my system (afterward 100++ logfiles).

That's a gdm3 bug, which should be fixed in gdm3 3.4.


> [   286.097] (II) RADEON(0): Output VGA-0 using monitor section JT198x4
[...] 
> [   286.377] (II) RADEON(0): EDID for output VGA-0
> [   286.377] (II) RADEON(0): Printing probed modes for output VGA-0
> [   286.377] (II) RADEON(0): Modeline "1024x768"x60.0   65.00  1024 1048 1184 1344  768 771 777 806 -hsync -vsync (48.4 kHz e)
> [   286.377] (II) RADEON(0): Modeline "800x600"x60.3   40.00  800 840 968 1056  600 601 605 628 +hsync +vsync (37.9 kHz e)
> [   286.377] (II) RADEON(0): Modeline "800x600"x56.2   36.00  800 824 896 1024  600 601 603 625 +hsync +vsync (35.2 kHz e)
> [   286.377] (II) RADEON(0): Modeline "848x480"x60.0   33.75  848 864 976 1088  480 486 494 517 +hsync +vsync (31.0 kHz e)
> [   286.377] (II) RADEON(0): Modeline "640x480"x59.9   25.18  640 656 752 800  480 489 492 525 -hsync -vsync (31.5 kHz e)

Looks like the monitor connected to the VGA output is providing an EDID
specifying 1024x768 as the maximum resolution.

You might be able to override this though, either by adding a ModeLine
for "1280x1024" in Section "Monitor" or at runtime using the xrandr
utility.


> [   286.626] (**) RADEON(0): Display dimensions: (1280, 1024) mm
> [   286.626] (**) RADEON(0): DPI set to (20, 19)

Probably not directly related to your problem, but these are pretty
weird settings you're specifying in xorg.conf...

Have you tried without any xorg.conf?


-- 
Earthling Michel Dänzer           |                   http://www.amd.com
Libre software enthusiast         |          Debian, X and DRI developer