[Bug 73530] Asus U38N: Black screen with Radeon driver in Linux

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73530

--- Comment #90 from Alex Deucher <alexdeucher at gmail.com> ---
(In reply to Nicolas Werner from comment #89)
> (In reply to Alex Deucher from comment #88)
> > Created attachment 115774 [details] [review] [review]
> > add some debugging output
> > 
> > Can you attach your dmesg output with this patch attached?  It should help
> > narrow down where the dpcd info is getting corrupted.
> 
> Here it is (only the relevant section):
> [    5.534907] [drm] radeon_dp_getdpcd
> [    5.534913] [drm] DPCD: 11 0a 84 01 00 0b 01 01 02 00 00 00 00 00 00
> [    5.565816] [drm] fb mappable at 0xD047B000
> [    5.565823] [drm] vram apper at 0xD0000000
> [    5.565825] [drm] size 8294400
> [    5.565828] [drm] fb depth is 24
> [    5.565830] [drm]    pitch is 7680
> [    5.566022] fbcon: radeondrmfb (fb0) is primary device
> [    5.566093] [drm] radeon_dp_set_link_config, 270000, 2
> [    5.566095] [drm] DPCD: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

Are you still hardcoding the lanes here?


> [    6.706063] [drm] radeon_dp_set_rx_power_state, 0
> [    6.706065] [drm] DPCD: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> [    7.843201] [drm] radeon_dp_link_train
> [    7.843203] [drm] DPCD: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> [    7.843204] [drm] dp_info dpcd: 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00
> [    7.843206] [drm] radeon_dp_set_rx_power_state, 0
> [    7.843206] [drm] DPCD: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

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