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trouble with radeon framebuffer driver



I am having some trouble with the radeon framebuffer driver in recent
kernels (Herbert's 2.4.22 with kernel-patch-benh, 2.4.23-pre5-ben0, and
2.4.21-ben2). When I boot I get the following messages from the kernel:

 PCI: Enabling device 00:10.0 (0086 -> 0087)
 radeonfb: ref_clk=2700, ref_div=12, xclk=36000 from OF
 radeonfb: Failed to detect DFP panel size
 Using unsupported 1024x768 ATY,Bee_A at 9c008000, depth=8, pitch=1024
 Console: switching to colour frame buffer device 128x48
 fb0: Open Firmware frame buffer device on /pci@f0000000/ATY,BeeParent@10/ATY,Bee_A
 Using unsupported 640x480 ATY,Bee_B at 99008000, depth=8, pitch=768
 fb1: Open Firmware frame buffer device on /pci@f0000000/ATY,BeeParent@10/ATY,Bee_B

However, this does not happen all the time. It has been consistent for
the past few days, but before that the driver was able to detect the
panel size correctly:

 radeonfb: ref_clk=2700, ref_div=12, xclk=36000 from OF
 radeonfb: detected DFP panel size from EDID: 1024x768
 Console: switching to colour frame buffer device 128x48
 Registered "ati" backlight controller, level: 15/15
 radeonfb: ATI Radeon M7 LW DDR SGRAM 32 MB
 radeonfb: DVI port LCD monitor connected
 radeonfb: CRT port no monitor connected
 radeonfb: Power Management enabled for Mobility chipsets

If I try to force the panel size using `video=radeon:panel_yres:768',
only one line of the display is visible. Trying `video=radeon:1024x768'
results in the OF framebuffer being used.

Does anybody have any idea what is going on?

-- 
gram

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