r296548 breaks external DP and HDMI on HD4000

[Ian FREISLICH]

Hi

With r296548 on the following hardware:

vgapci0 at pci0:0:2:0:     class=0x030000 card=0x15171043 chip=0x01668086
rev=0x09 hdr=0x00
    vendor     = 'Intel Corporation'
    device     = '3rd Gen Core processor Graphics Controller'
    class      = display
    subclass   = VGA
    cap 05[90] = MSI supports 1 message enabled with 1 message
    cap 01[d0] = powerspec 2  supports D0 D3  current D0
    cap 13[a4] = PCI Advanced Features: FLR TP

I get the following console messages when X starts and my external
monitor (Samsung U28E590) goes into epileptic fit attack mode.

[drm] Initialized i915 1.6.0 20080730 for drmn0 on minor 0
[drm:pid0:intel_dp_complete_link_train] *ERROR* failed to train DP, aborting
[drm] Enabling RC6 states: RC6 on, RC6p on, RC6pp off
[drm:pid0:intel_cpt_verify_modeset] *ERROR* mode set failed: pipe 0 stuck
[drm:pid1100:ironlake_check_fdi_lanes] *ERROR* WARN ON:
I915_READ(SOUTH_CHICKEN1) & FDI_BC_BIFURCATION_SELECT
[drm:pid1100:ivb_manual_fdi_link_train] *ERROR* FDI train 1 fail!
[drm:pid1100:ivb_manual_fdi_link_train] *ERROR* FDI train 2 fail!

The good news is that I no longer need the following hack to turn on the
back light this laptop's LVDS display:

Index: sys/dev/drm2/i915/intel_display.c
===================================================================
--- sys/dev/drm2/i915/intel_display.c   (revision 296547)
+++ sys/dev/drm2/i915/intel_display.c   (working copy)
@@ -6960,7 +6960,7 @@
         */
        I915_WRITE(BLC_PWM_CPU_CTL2, PWM_ENABLE);
        I915_WRITE(BLC_PWM_CPU_CTL, 0);
-       I915_WRITE(BLC_PWM_PCH_CTL1, PWM_ENABLE);
+       I915_WRITE(BLC_PWM_PCH_CTL1, PWM_ENABLE | (1<<30));
 }
 
 void intel_modeset_init_hw(struct drm_device *dev)

-- 
Ian Freislich


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