linux-kernel - Re: [Intel-gfx] [bisected] offset display bug in i915

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Date:	Mon, 08 Nov 2010 06:29:09 -0500
From:	Jon Masters <jonathan@...masters.org>
To:	Chris Wilson <chris@...is-wilson.co.uk>
Cc:	intel-gfx <intel-gfx@...ts.freedesktop.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [Intel-gfx] [bisected] offset display bug in i915

On Mon, 2010-11-08 at 06:22 -0500, Jon Masters wrote:
> On Mon, 2010-11-08 at 05:54 -0500, Jon Masters wrote:
> 
> > Here is the EDID output after booting:
> > 
> > [jcm@...ticello ~]$ hexdump /sys/class/drm/card0-LVDS-1/edid
> > 0000000 ff00 ffff ffff 00ff 6422 03e9 8544 0001
> > 0000010 141c 0301 1680 780d 860a 9426 5157 2790
> > 0000020 4f21 0054 0000 0101 0101 0101 0101 0101
> > 0000030 0101 0101 0101 1194 b000 5840 2019 2335
> > 0000040 0045 81dc 0000 1900 1416 d800 5840 2026
> > 0000050 235d 0415 81dc 0000 0000 0000 fe00 0000
> > 0000060 0000 0000 0000 0000 0000 0000 0000 fe00
> > 0000070 0000 0000 0000 0000 0100 0000 0000 f200
> > 0000080
> 
> As I mentioned on IRC, I'm familiar with how I2C works electrically, and
> therefore EDID implementation as a concept, but I am not really a
> graphics hacker so I wasn't aware that you prefer edid-decode :)
> 
> Here is a decoded version of the output:

And here is an old file I had with the output when running a broken
kernel with the cacheing enabled:

Screen 0: minimum 320 x 200, current 1024 x 600, maximum 4096 x 4096
LVDS1 connected 1024x600+0+0 (0x43) normal (normal left inverted right x
axis y axis) 220mm x 129mm
	Identifier: 0x41
	Timestamp:  1402374
	Subpixel:   horizontal rgb
	Gamma:      1.0:1.0:1.0
	Brightness: 1.0
	Clones:    
	CRTC:       1
	CRTCs:      1
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
	EDID:
		00ffffffffffff002264e90344850100
		1c14010380160d780a86269457519027
		214f5400000001010101010101010101
		010101010101941100b0405819203523
		4500dc8100000019161400d840582620
		5d231504dc8100000000000000fe0000
		000000000000000000000000000000fe
		000000000000000000010000000000f2
	BACKLIGHT: 10 (0x0000000a)	range:  (0,10)
	Backlight: 10 (0x0000000a)	range:  (0,10)
	scaling mode:	Full aspect
		supported: None         Full         Center       Full aspect 
  1024x600 (0x43)   45.0MHz -HSync -VSync *current +preferred
        h: width  1024 start 1077 end 1112 total 1200 skew    0 clock
37.5KHz
        v: height  600 start  604 end  609 total  625           clock
60.0Hz
  1024x600 (0x44)   51.4MHz -HSync -VSync
        h: width  1024 start 1117 end 1152 total 1240 skew    0 clock
41.5KHz
        v: height  600 start  601 end  606 total  638           clock
65.0Hz
  800x600 (0x45)   40.0MHz +HSync +VSync
        h: width   800 start  840 end  968 total 1056 skew    0 clock
37.9KHz
        v: height  600 start  601 end  605 total  628           clock
60.3Hz
  800x600 (0x46)   36.0MHz +HSync +VSync
        h: width   800 start  824 end  896 total 1024 skew    0 clock
35.2KHz
        v: height  600 start  601 end  603 total  625           clock
56.2Hz
  640x480 (0x47)   25.2MHz -HSync -VSync
        h: width   640 start  656 end  752 total  800 skew    0 clock
31.5KHz
        v: height  480 start  490 end  492 total  525           clock
59.9Hz
VGA1 disconnected (normal left inverted right x axis y axis)
	Identifier: 0x42
	Timestamp:  1402374
	Subpixel:   unknown
	Clones:    
	CRTCs:      0 1
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 

Jon.


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