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

From: Jon Masters
Date: Mon Nov 08 2010 - 18:08:48 EST

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On Mon, 2010-11-08 at 12:13 +0000, Chris Wilson wrote:
> On Mon, 08 Nov 2010 06:29:09 -0500, Jon Masters <jonathan@xxxxxxxxxxxxxx> wrote:
> > On Mon, 2010-11-08 at 06:22 -0500, Jon Masters wrote:
> > > 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:
>
> They look to be identical. So it is not necessarily the caching that is
> the issue, but that we now no longer do an essential step whilst bringing
> up the lvds. Can you just check that the reported EDIDs are the same for
> when it is behaving correctly and when the display is offset?
>
> The secondary change in the commit was to use drm_get_edid() directly
> during device detection which delayed setting the EDID property on the
> connection until get_modes(). Does this make a difference?
>
> diff --git a/drivers/gpu/drm/i915/intel_lvds.c
> b/drivers/gpu/drm/i915/intel_lvds
> index f1a6499..17bcb7d 100644
> --- a/drivers/gpu/drm/i915/intel_lvds.c
> +++ b/drivers/gpu/drm/i915/intel_lvds.c
> @@ -940,7 +940,10 @@ void intel_lvds_init(struct drm_device *dev)
> intel_lvds->edid = drm_get_edid(connector,
> &dev_priv->gmbus[pin].adapter);
>
> - if (!intel_lvds->edid) {
> + if (intel_lvds->edid) {
> + drm_mode_connector_update_edid_property(connector,
> + intel_lvds->edid);
> + } else {

I tried this, which didn't work. Then I added this (ignore stupid
evolution formatting - convenient for email backlog, but not mutt):

diff --git a/drivers/gpu/drm/i915/intel_lvds.c
b/drivers/gpu/drm/i915/intel_lvds.c
index 17bcb7d..a0bb443 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -462,6 +462,14 @@ intel_lvds_detect(struct drm_connector *connector,
bool force)
{
struct drm_device *dev = connector->dev;
enum drm_connector_status status = connector_status_connected;
+ /* JCM - added this */
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ u8 pin = GMBUS_PORT_PANEL;
+ struct edid *edid = drm_get_edid(connector,
&dev_priv->gmbus[pin].adapter);
+
+ /* I was asked to free in here */
+ if (edid)
+ kfree(edid);

/* ACPI lid methods were generally unreliable in this
generation, so
* don't even bother.

Which should have made the edid always get freed on detect. That didn't
work either. I might wind up learning something about the DRM stack.

Anyway. Here's the reg dumper output. First, for a busticated kernel:

[jcm@constitution ~]$ cat intel_regs_broken.txt
DCC: 0x00200020 (single channel, XOR randomization:
enabled, XOR bit: 11)
CHDECMISC: 0x42000064 (XOR bank, ch2 enh disabled, ch1 enh
disabled, ch0 enh enabled, flex disabled, ep not present)
C0DRB0: 0x00200020 (0x0020)
C0DRB1: 0x00200020 (0x0020)
C0DRB2: 0x00200020 (0x0020)
C0DRB3: 0x00880020 (0x0020)
C1DRB0: 0x00000000 (0x0000)
C1DRB1: 0x00000000 (0x0000)
C1DRB2: 0x00000000 (0x0000)
C1DRB3: 0x00000000 (0x0000)
C0DRA01: 0x00000088 (0x0088)
C0DRA23: 0x00000000 (0x0000)
C1DRA01: 0x00000000 (0x0000)
C1DRA23: 0x00000000 (0x0000)
PGETBL_CTL: 0x00000001
VCLK_DIVISOR_VGA0: 0x00200074 (n = 32, m1 = 0, m2 = 52)
VCLK_DIVISOR_VGA1: 0x00200074 (n = 32, m1 = 0, m2 = 52)
VCLK_POST_DIV: 0x00800100 (vga0 p1 = 2, p2 = 2, vga1 p1 = 3, p2 =
2)
DPLL_TEST: 0x00010001 ()
CACHE_MODE_0: 0x00006820
D_STATE: 0x0000000b
DSPCLK_GATE_D: 0x00000000 (clock gates disabled:)
RENCLK_GATE_D1: 0x00000000
RENCLK_GATE_D2: 0x00000000
SDVOB: 0x00300000 (disabled, pipe A, stall disabled, not
detected)
SDVOC: 0x00300000 (disabled, pipe A, stall disabled, not
detected)
SDVOUDI: 0x00000000
DSPARB: 0x00001d9c
DSPFW1: 0xf1830f0f
DSPFW2: 0x0000030f
DSPFW3: 0x6700018f
ADPA: 0x40008c18 (disabled, pipe B, +hsync, +vsync)
LVDS: 0xc0308300 (enabled, pipe B, 18 bit, 1 channel)
DVOA: 0x00000000 (disabled, pipe A, no stall, -hsync,
-vsync)
DVOB: 0x00300000 (disabled, pipe A, no stall, -hsync,
-vsync)
DVOC: 0x00300000 (disabled, pipe A, no stall, -hsync,
-vsync)
DVOA_SRCDIM: 0x00000000
DVOB_SRCDIM: 0x00000000
DVOC_SRCDIM: 0x00000000
PP_CONTROL: 0x00000001 (power target: on)
PP_STATUS: 0xc0000008 (on, ready, sequencing idle)
PP_ON_DELAYS: 0x025807d0
PP_OFF_DELAYS: 0x01f407d0
PP_DIVISOR: 0x00209d05
PFIT_CONTROL: 0x00000008
PFIT_PGM_RATIOS: 0x00000000
PORT_HOTPLUG_EN: 0x00000220
PORT_HOTPLUG_STAT: 0x00001000
DSPACNTR: 0xd9000000 (enabled, pipe B)
DSPASTRIDE: 0x00001000 (4096 bytes)
DSPAPOS: 0x00000000 (0, 0)
DSPASIZE: 0x025703ff (1024, 600)
DSPABASE: 0x00830000
DSPASURF: 0x00000000
DSPATILEOFF: 0x00000000
PIPEACONF: 0x00000000 (disabled, single-wide)
PIPEASRC: 0x027f01df (640, 480)
PIPEASTAT: 0x00000000 (status:)
PIPEA_GMCH_DATA_M: 0x00000000
PIPEA_GMCH_DATA_N: 0x00000000
PIPEA_DP_LINK_M: 0x00000000
PIPEA_DP_LINK_N: 0x00000000
CURSOR_A_BASE: 0x00000000
CURSOR_A_CONTROL: 0x00000000
CURSOR_A_POSITION: 0x00000000
FPA0: 0x00200074 (n = 32, m1 = 0, m2 = 52)
FPA1: 0x00200074 (n = 32, m1 = 0, m2 = 52)
DPLL_A: 0x04800000 (disabled, non-dvo, VGA, default clock,
DAC/serial mode, p1 = 9, p2 = 10, SDVO mult 1)
DPLL_A_MD: 0x00000000
HTOTAL_A: 0x031f027f (640 active, 800 total)
HBLANK_A: 0x03170287 (648 start, 792 end)
HSYNC_A: 0x02ef028f (656 start, 752 end)
VTOTAL_A: 0x020c01df (480 active, 525 total)
VBLANK_A: 0x020401e7 (488 start, 517 end)
VSYNC_A: 0x01eb01e9 (490 start, 492 end)
BCLRPAT_A: 0x00000000
VSYNCSHIFT_A: 0x00000000
DSPBCNTR: 0x49000000 (disabled, pipe B)
DSPBSTRIDE: 0x00000280 (640 bytes)
DSPBPOS: 0x00000000 (0, 0)
DSPBSIZE: 0x018f02cf (720, 400)
DSPBBASE: 0x00000000
DSPBSURF: 0x00000000
DSPBTILEOFF: 0x00000000
PIPEBCONF: 0x80000000 (enabled, single-wide)
PIPEBSRC: 0x03ff0257 (1024, 600)
PIPEBSTAT: 0x00400202 (status: LBLC_EVENT_ENABLE
VSYNC_INT_STATUS VBLANK_INT_STATUS)
PIPEB_GMCH_DATA_M: 0x00000000
PIPEB_GMCH_DATA_N: 0x00000000
PIPEB_DP_LINK_M: 0x00000000
PIPEB_DP_LINK_N: 0x00000000
CURSOR_B_BASE: 0x00000000
CURSOR_B_CONTROL: 0x10000000
CURSOR_B_POSITION: 0x012801f9
FPB0: 0x0020008c (n = 32, m1 = 0, m2 = 12)
FPB1: 0x0020008c (n = 32, m1 = 0, m2 = 12)
DPLL_B: 0x98020000 (enabled, non-dvo, default clock, LVDS
mode, p1 = 3, p2 = 14, SDVO mult 1)
DPLL_B_MD: 0x00000000
HTOTAL_B: 0x053f03ff (1024 active, 1344 total)
HBLANK_B: 0x053f03ff (1024 start, 1344 end)
HSYNC_B: 0x049f0417 (1048 start, 1184 end)
VTOTAL_B: 0x03250257 (600 active, 806 total)
VBLANK_B: 0x02d102ab (684 start, 722 end)
VSYNC_B: 0x02c102bb (700 start, 706 end)
BCLRPAT_B: 0x00000000
VSYNCSHIFT_B: 0x00000000
VCLK_DIVISOR_VGA0: 0x00200074
VCLK_DIVISOR_VGA1: 0x00200074
VCLK_POST_DIV: 0x00800100
VGACNTRL: 0x80000000 (disabled)
TV_CTL: 0x00000000
TV_DAC: 0x00000000
TV_CSC_Y: 0x00000000
TV_CSC_Y2: 0x00000000
TV_CSC_U: 0x00000000
TV_CSC_U2: 0x00000000
TV_CSC_V: 0x00000000
TV_CSC_V2: 0x00000000
TV_CLR_KNOBS: 0x00000000
TV_CLR_LEVEL: 0x00000000
TV_H_CTL_1: 0x00000000
TV_H_CTL_2: 0x00000000
TV_H_CTL_3: 0x00000000
TV_V_CTL_1: 0x00000000
TV_V_CTL_2: 0x00000000
TV_V_CTL_3: 0x00000000
TV_V_CTL_4: 0x00000000
TV_V_CTL_5: 0x00000000
TV_V_CTL_6: 0x00000000
TV_V_CTL_7: 0x00000000
TV_SC_CTL_1: 0x00000000
TV_SC_CTL_2: 0x00000000
TV_SC_CTL_3: 0x00000000
TV_WIN_POS: 0x00000000
TV_WIN_SIZE: 0x00000000
TV_FILTER_CTL_1: 0x00000000
TV_FILTER_CTL_2: 0x00000000
TV_FILTER_CTL_3: 0x00000000
TV_CC_CONTROL: 0x00000000
TV_CC_DATA: 0x00000000
TV_H_LUMA_0: 0x00000000
TV_H_LUMA_59: 0x00000000
TV_H_CHROMA_0: 0x00000000
TV_H_CHROMA_59: 0x00000000
FBC_CFB_BASE: 0xffffffff
FBC_LL_BASE: 0xffffffff
FBC_CONTROL: 0xffffffff
FBC_COMMAND: 0xffffffff
FBC_STATUS: 0xffffffff
FBC_CONTROL2: 0xffffffff
FBC_FENCE_OFF: 0xffffffff
FBC_MOD_NUM: 0xffffffff
MI_MODE: 0x00000200
MI_ARB_STATE: 0x00000840
MI_RDRET_STATE: 0x00000000
ECOSKPD: 0x00000307
DP_B: 0x00000000
DPB_AUX_CH_CTL: 0x00000000
DPB_AUX_CH_DATA1: 0x00000000
DPB_AUX_CH_DATA2: 0x00000000
DPB_AUX_CH_DATA3: 0x00000000
DPB_AUX_CH_DATA4: 0x00000000
DPB_AUX_CH_DATA5: 0x00000000
DP_C: 0x00000000
DPC_AUX_CH_CTL: 0x00000000
DPC_AUX_CH_DATA1: 0x00000000
DPC_AUX_CH_DATA2: 0x00000000
DPC_AUX_CH_DATA3: 0x00000000
DPC_AUX_CH_DATA4: 0x00000000
DPC_AUX_CH_DATA5: 0x00000000
DP_D: 0x00000000
DPD_AUX_CH_CTL: 0x00000000
DPD_AUX_CH_DATA1: 0x00000000
DPD_AUX_CH_DATA2: 0x00000000
DPD_AUX_CH_DATA3: 0x00000000
DPD_AUX_CH_DATA4: 0x00000000
DPD_AUX_CH_DATA5: 0x00000000
AUD_CONFIG: 0x00000000
AUD_HDMIW_STATUS: 0x00000000
AUD_CONV_CHCNT: 0x00000000
VIDEO_DIP_CTL: 0x00000000
AUD_PINW_CNTR: 0x00000000
AUD_CNTL_ST: 0x00000000
AUD_PIN_CAP: 0x00000000
AUD_PINW_CAP: 0x00000000
AUD_PINW_UNSOLRESP: 0x00000000
AUD_OUT_DIG_CNVT: 0x00000000
AUD_OUT_CWCAP: 0x00000000
AUD_GRP_CAP: 0x00000000
FENCE 0: 0x00c00231 (enabled, X tiled, 4096 pitch,
0x00c00000 - 0x01000000 (4096kb))
FENCE 1: 0x01000231 (enabled, X tiled, 4096 pitch,
0x01000000 - 0x01400000 (4096kb))
FENCE 2: 0x00000000 (disabled)
FENCE 3: 0x00000000 (disabled)
FENCE 4: 0x00000000 (disabled)
FENCE 5: 0x00000000 (disabled)
FENCE 6: 0x00000000 (disabled)
FENCE 7: 0x00000000 (disabled)
FENCE 8: 0x00000000 (disabled)
FENCE 9: 0x00000000 (disabled)
FENCE 10: 0x00000000 (disabled)
FENCE 11: 0x00000000 (disabled)
FENCE 12: 0x00000000 (disabled)
FENCE 13: 0x00000000 (disabled)
FENCE 14: 0x00000000 (disabled)
FENCE 15: 0x00000000 (disabled)
INST_PM: 0x00000000
pipe A dot 25173 n 5 m1 0 m2 116 p1 9 p2 10
pipe B dot 64914 n 5 m1 0 m2 140 p1 3 p2 14

And here for a non-busticated kernel:

[jcm@constitution ~]$ cat intel_regs_works.txt
DCC: 0x00200020 (single channel, XOR randomization:
enabled, XOR bit: 11)
CHDECMISC: 0x42000064 (XOR bank, ch2 enh disabled, ch1 enh
disabled, ch0 enh enabled, flex disabled, ep not present)
C0DRB0: 0x00200020 (0x0020)
C0DRB1: 0x00200020 (0x0020)
C0DRB2: 0x00200020 (0x0020)
C0DRB3: 0x00880020 (0x0020)
C1DRB0: 0x00000000 (0x0000)
C1DRB1: 0x00000000 (0x0000)
C1DRB2: 0x00000000 (0x0000)
C1DRB3: 0x00000000 (0x0000)
C0DRA01: 0x00000088 (0x0088)
C0DRA23: 0x00000000 (0x0000)
C1DRA01: 0x00000000 (0x0000)
C1DRA23: 0x00000000 (0x0000)
PGETBL_CTL: 0x00000001
VCLK_DIVISOR_VGA0: 0x00200074 (n = 32, m1 = 0, m2 = 52)
VCLK_DIVISOR_VGA1: 0x00200074 (n = 32, m1 = 0, m2 = 52)
VCLK_POST_DIV: 0x00800100 (vga0 p1 = 2, p2 = 2, vga1 p1 = 3, p2 =
2)
DPLL_TEST: 0x00010001 ()
CACHE_MODE_0: 0x00006820
D_STATE: 0x0000000b
DSPCLK_GATE_D: 0x00000000 (clock gates disabled:)
RENCLK_GATE_D1: 0x00000000
RENCLK_GATE_D2: 0x00000000
SDVOB: 0x00300000 (disabled, pipe A, stall disabled, not
detected)
SDVOC: 0x00300000 (disabled, pipe A, stall disabled, not
detected)
SDVOUDI: 0x00000000
DSPARB: 0x00001d9c
DSPFW1: 0xf1830f0f
DSPFW2: 0x0000030f
DSPFW3: 0x6700018f
ADPA: 0x40008c18 (disabled, pipe B, +hsync, +vsync)
LVDS: 0xc0300300 (enabled, pipe B, 18 bit, 1 channel)
DVOA: 0x00000000 (disabled, pipe A, no stall, -hsync,
-vsync)
DVOB: 0x00300000 (disabled, pipe A, no stall, -hsync,
-vsync)
DVOC: 0x00300000 (disabled, pipe A, no stall, -hsync,
-vsync)
DVOA_SRCDIM: 0x00000000
DVOB_SRCDIM: 0x00000000
DVOC_SRCDIM: 0x00000000
PP_CONTROL: 0x00000001 (power target: on)
PP_STATUS: 0xc0000008 (on, ready, sequencing idle)
PP_ON_DELAYS: 0x025807d0
PP_OFF_DELAYS: 0x01f407d0
PP_DIVISOR: 0x00209d05
PFIT_CONTROL: 0x00000008
PFIT_PGM_RATIOS: 0x00000000
PORT_HOTPLUG_EN: 0x00000220
PORT_HOTPLUG_STAT: 0x00001000
DSPACNTR: 0xd9000000 (enabled, pipe B)
DSPASTRIDE: 0x00001000 (4096 bytes)
DSPAPOS: 0x00000000 (0, 0)
DSPASIZE: 0x025703ff (1024, 600)
DSPABASE: 0x00830000
DSPASURF: 0x00000000
DSPATILEOFF: 0x00000000
PIPEACONF: 0x00000000 (disabled, single-wide)
PIPEASRC: 0x027f01df (640, 480)
PIPEASTAT: 0x00000000 (status:)
PIPEA_GMCH_DATA_M: 0x00000000
PIPEA_GMCH_DATA_N: 0x00000000
PIPEA_DP_LINK_M: 0x00000000
PIPEA_DP_LINK_N: 0x00000000
CURSOR_A_BASE: 0x00000000
CURSOR_A_CONTROL: 0x00000000
CURSOR_A_POSITION: 0x00000000
FPA0: 0x00200074 (n = 32, m1 = 0, m2 = 52)
FPA1: 0x00200074 (n = 32, m1 = 0, m2 = 52)
DPLL_A: 0x04800000 (disabled, non-dvo, VGA, default clock,
DAC/serial mode, p1 = 9, p2 = 10, SDVO mult 1)
DPLL_A_MD: 0x00000000
HTOTAL_A: 0x031f027f (640 active, 800 total)
HBLANK_A: 0x03170287 (648 start, 792 end)
HSYNC_A: 0x02ef028f (656 start, 752 end)
VTOTAL_A: 0x020c01df (480 active, 525 total)
VBLANK_A: 0x020401e7 (488 start, 517 end)
VSYNC_A: 0x01eb01e9 (490 start, 492 end)
BCLRPAT_A: 0x00000000
VSYNCSHIFT_A: 0x00000000
DSPBCNTR: 0x49000000 (disabled, pipe B)
DSPBSTRIDE: 0x00000280 (640 bytes)
DSPBPOS: 0x00000000 (0, 0)
DSPBSIZE: 0x018f02cf (720, 400)
DSPBBASE: 0x00000000
DSPBSURF: 0x00000000
DSPBTILEOFF: 0x00000000
PIPEBCONF: 0x80000000 (enabled, single-wide)
PIPEBSRC: 0x03ff0257 (1024, 600)
PIPEBSTAT: 0x00400202 (status: LBLC_EVENT_ENABLE
VSYNC_INT_STATUS VBLANK_INT_STATUS)
PIPEB_GMCH_DATA_M: 0x00000000
PIPEB_GMCH_DATA_N: 0x00000000
PIPEB_DP_LINK_M: 0x00000000
PIPEB_DP_LINK_N: 0x00000000
CURSOR_B_BASE: 0x00000000
CURSOR_B_CONTROL: 0x10000000
CURSOR_B_POSITION: 0x012801f9
FPB0: 0x00100067 (n = 16, m1 = 0, m2 = 39)
FPB1: 0x00100067 (n = 16, m1 = 0, m2 = 39)
DPLL_B: 0x98040000 (enabled, non-dvo, default clock, LVDS
mode, p1 = 4, p2 = 14, SDVO mult 1)
DPLL_B_MD: 0x00000000
HTOTAL_B: 0x04af03ff (1024 active, 1200 total)
HBLANK_B: 0x04af03ff (1024 start, 1200 end)
HSYNC_B: 0x04570434 (1077 start, 1112 end)
VTOTAL_B: 0x02700257 (600 active, 625 total)
VBLANK_B: 0x02700257 (600 start, 625 end)
VSYNC_B: 0x0260025b (604 start, 609 end)
BCLRPAT_B: 0x00000000
VSYNCSHIFT_B: 0x00000000
VCLK_DIVISOR_VGA0: 0x00200074
VCLK_DIVISOR_VGA1: 0x00200074
VCLK_POST_DIV: 0x00800100
VGACNTRL: 0x80000000 (disabled)
TV_CTL: 0x00000000
TV_DAC: 0x00000000
TV_CSC_Y: 0x00000000
TV_CSC_Y2: 0x00000000
TV_CSC_U: 0x00000000
TV_CSC_U2: 0x00000000
TV_CSC_V: 0x00000000
TV_CSC_V2: 0x00000000
TV_CLR_KNOBS: 0x00000000
TV_CLR_LEVEL: 0x00000000
TV_H_CTL_1: 0x00000000
TV_H_CTL_2: 0x00000000
TV_H_CTL_3: 0x00000000
TV_V_CTL_1: 0x00000000
TV_V_CTL_2: 0x00000000
TV_V_CTL_3: 0x00000000
TV_V_CTL_4: 0x00000000
TV_V_CTL_5: 0x00000000
TV_V_CTL_6: 0x00000000
TV_V_CTL_7: 0x00000000
TV_SC_CTL_1: 0x00000000
TV_SC_CTL_2: 0x00000000
TV_SC_CTL_3: 0x00000000
TV_WIN_POS: 0x00000000
TV_WIN_SIZE: 0x00000000
TV_FILTER_CTL_1: 0x00000000
TV_FILTER_CTL_2: 0x00000000
TV_FILTER_CTL_3: 0x00000000
TV_CC_CONTROL: 0x00000000
TV_CC_DATA: 0x00000000
TV_H_LUMA_0: 0x00000000
TV_H_LUMA_59: 0x00000000
TV_H_CHROMA_0: 0x00000000
TV_H_CHROMA_59: 0x00000000
FBC_CFB_BASE: 0xffffffff
FBC_LL_BASE: 0xffffffff
FBC_CONTROL: 0xffffffff
FBC_COMMAND: 0xffffffff
FBC_STATUS: 0xffffffff
FBC_CONTROL2: 0xffffffff
FBC_FENCE_OFF: 0xffffffff
FBC_MOD_NUM: 0xffffffff
MI_MODE: 0x00000200
MI_ARB_STATE: 0x00000840
MI_RDRET_STATE: 0x00000000
ECOSKPD: 0x00000307
DP_B: 0x00000000
DPB_AUX_CH_CTL: 0x00000000
DPB_AUX_CH_DATA1: 0x00000000
DPB_AUX_CH_DATA2: 0x00000000
DPB_AUX_CH_DATA3: 0x00000000
DPB_AUX_CH_DATA4: 0x00000000
DPB_AUX_CH_DATA5: 0x00000000
DP_C: 0x00000000
DPC_AUX_CH_CTL: 0x00000000
DPC_AUX_CH_DATA1: 0x00000000
DPC_AUX_CH_DATA2: 0x00000000
DPC_AUX_CH_DATA3: 0x00000000
DPC_AUX_CH_DATA4: 0x00000000
DPC_AUX_CH_DATA5: 0x00000000
DP_D: 0x00000000
DPD_AUX_CH_CTL: 0x00000000
DPD_AUX_CH_DATA1: 0x00000000
DPD_AUX_CH_DATA2: 0x00000000
DPD_AUX_CH_DATA3: 0x00000000
DPD_AUX_CH_DATA4: 0x00000000
DPD_AUX_CH_DATA5: 0x00000000
AUD_CONFIG: 0x00000000
AUD_HDMIW_STATUS: 0x00000000
AUD_CONV_CHCNT: 0x00000000
VIDEO_DIP_CTL: 0x00000000
AUD_PINW_CNTR: 0x00000000
AUD_CNTL_ST: 0x00000000
AUD_PIN_CAP: 0x00000000
AUD_PINW_CAP: 0x00000000
AUD_PINW_UNSOLRESP: 0x00000000
AUD_OUT_DIG_CNVT: 0x00000000
AUD_OUT_CWCAP: 0x00000000
AUD_GRP_CAP: 0x00000000
FENCE 0: 0x00c00231 (enabled, X tiled, 4096 pitch,
0x00c00000 - 0x01000000 (4096kb))
FENCE 1: 0x01000231 (enabled, X tiled, 4096 pitch,
0x01000000 - 0x01400000 (4096kb))
FENCE 2: 0x01400231 (enabled, X tiled, 4096 pitch,
0x01400000 - 0x01800000 (4096kb))
FENCE 3: 0x00000000 (disabled)
FENCE 4: 0x00000000 (disabled)
FENCE 5: 0x00000000 (disabled)
FENCE 6: 0x00000000 (disabled)
FENCE 7: 0x00000000 (disabled)
FENCE 8: 0x00000000 (disabled)
FENCE 9: 0x00000000 (disabled)
FENCE 10: 0x00000000 (disabled)
FENCE 11: 0x00000000 (disabled)
FENCE 12: 0x00000000 (disabled)
FENCE 13: 0x00000000 (disabled)
FENCE 14: 0x00000000 (disabled)
FENCE 15: 0x00000000 (disabled)
INST_PM: 0x00000000
pipe A dot 25173 n 5 m1 0 m2 116 p1 9 p2 10
pipe B dot 45000 n 4 m1 0 m2 103 p1 4 p2 14

Here's the diff between the two:

[jcm@constitution ~]$ diff intel_regs_broken.txt intel_regs_works.txt
33c33
< LVDS: 0xc0308300 (enabled, pipe B, 18 bit, 1 channel)
---
> LVDS: 0xc0300300 (enabled, pipe B, 18 bit, 1 channel)
95,97c95,97
< FPB0: 0x0020008c (n = 32, m1 = 0, m2 = 12)
< FPB1: 0x0020008c (n = 32, m1 = 0, m2 = 12)
< DPLL_B: 0x98020000 (enabled, non-dvo, default clock,
LVDS mode, p1 = 3, p2 = 14, SDVO mult 1)
---
> FPB0: 0x00100067 (n = 16, m1 = 0, m2 = 39)
> FPB1: 0x00100067 (n = 16, m1 = 0, m2 = 39)
> DPLL_B: 0x98040000 (enabled, non-dvo, default clock,
LVDS mode, p1 = 4, p2 = 14, SDVO mult 1)
99,104c99,104
< HTOTAL_B: 0x053f03ff (1024 active, 1344 total)
< HBLANK_B: 0x053f03ff (1024 start, 1344 end)
< HSYNC_B: 0x049f0417 (1048 start, 1184 end)
< VTOTAL_B: 0x03250257 (600 active, 806 total)
< VBLANK_B: 0x02d102ab (684 start, 722 end)
< VSYNC_B: 0x02c102bb (700 start, 706 end)
---
> HTOTAL_B: 0x04af03ff (1024 active, 1200 total)
> HBLANK_B: 0x04af03ff (1024 start, 1200 end)
> HSYNC_B: 0x04570434 (1077 start, 1112 end)
> VTOTAL_B: 0x02700257 (600 active, 625 total)
> VBLANK_B: 0x02700257 (600 start, 625 end)
> VSYNC_B: 0x0260025b (604 start, 609 end)
192c192
< FENCE 2: 0x00000000 (disabled)
---
> FENCE 2: 0x01400231 (enabled, X tiled, 4096 pitch,
0x01400000 - 0x01800000 (4096kb))
208c208
< pipe B dot 64914 n 5 m1 0 m2 140 p1 3 p2 14
---
> pipe B dot 45000 n 4 m1 0 m2 103 p1 4 p2 14

Jon.

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