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diff -up xf86-video-ati-6.12.1/src/radeon_driver.c.jx xf86-video-ati-6.12.1/src/radeon_driver.c
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--- xf86-video-ati-6.12.1/src/radeon_driver.c.jx	2009-04-09 11:40:31.000000000 -0400
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+++ xf86-video-ati-6.12.1/src/radeon_driver.c	2009-04-09 11:52:43.000000000 -0400
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@@ -3089,6 +3089,15 @@ Bool RADEONPreInit(ScrnInfoPtr pScrn, in
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 	    } else if (IS_R300_VARIANT) {
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 		crtc_max_X = 2560;
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 		crtc_max_Y = 1200;
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+	    } else if (info->ChipFamily >= CHIP_FAMILY_R600) {
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+		/* no kms, but also no 3d, so be a little aggressive */
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+		if (pScrn->videoRam >= 128 * 1024) {
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+		    crtc_max_X = 4096;
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+		    crtc_max_Y = 1920;
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+		} else {
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+		    crtc_max_X = 2560; 
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+		    crtc_max_Y = 1920;
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+		}
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 	    } else if (IS_AVIVO_VARIANT) {
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 		crtc_max_X = 2560;
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 		crtc_max_Y = 1600;