[Bug 102022] [HSW] i915: null pointer in intel_dp_max_link_rate+0x5/0x80

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102022

--- Comment #5 from Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com> ---
(In reply to sassmann from comment #0)
> After switching display inputs on the monitor (Dell U3415W) the screen
> wouldn't come back from standby. Reproduced this with drm-tip

Thanks for filing this bug.

Can you please describe this a bit more in detail?
What was the display input switch that caused this?
What was the DP mode in the monitor at that time?
How did you switch the display input?
Does this happen if you don't force the mode from cmdline?

Can you please try this hack?

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 76c8a0b..197db3d 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -2486,7 +2486,7 @@ void intel_dp_sink_dpms(struct intel_dp *intel_dp, int
mode)

        if (mode != DRM_MODE_DPMS_ON) {
                ret = drm_dp_dpcd_writeb(&intel_dp->aux, DP_SET_POWER,
-                                        DP_SET_POWER_D3);
+                                        0x5);
        } else {
                struct intel_lspcon *lspcon = dp_to_lspcon(intel_dp);

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