Re: r296548 breaks external DP and HDMI on HD4000

Hi

Replying to myself...

The monitor works with in 1920x1080.  Any higher resolution and the
monitor displays rapidly changing random colours filled over the entire
screen.  I'm currently using r298115 with no improvement on the situation.

Ian

On 03/14/16 13:59, Ian FREISLICH wrote:
> 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)
> _at__at_ -6960,7 +6960,7 _at__at_
>          */
>         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
(M) +1 404 574 0228


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