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

[bugzilla-daemon@freedesktop.org]

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

--- Comment #94 from Nicolas Werner <nicolas.werner@ymail.com> ---
(In reply to Alex Deucher from comment #93)
> Created attachment 115778 [details] [review]
> debuging patch
> 
> Your dpcd is indeed getting corrupted somehow.  I can't see how though.  The
> attached patch (please drop your hardcode to 2 patch when you apply this
> one) should workaround the issue by re-fetching the dpcd when required, but
> doesn't fix the root cause.  Please attach the dmesg output with this patch
> applied as well.  I'd like to see how often it's getting corrupted.

Interestingly this doesn't work, I get the same blackscreen as usually:

[    5.946595] [drm] radeon_dp_getdpcd
[    5.946601] [drm] DPCD: 11 0a 84 01 00 0b 01 01 02 00 00 00 00 00 00
[    5.978557] [drm] fb mappable at 0xD047B000
[    5.978563] [drm] vram apper at 0xD0000000
[    5.978565] [drm] size 8294400
[    5.978567] [drm] fb depth is 24
[    5.978569] [drm]    pitch is 7680
[    5.978789] fbcon: radeondrmfb (fb0) is primary device
[    5.978881] [drm:radeon_dp_set_link_config] *ERROR* corrupt dpcd, updating
[    5.979556] [drm] radeon_dp_set_link_config, 540000, 1
[    5.979558] [drm] DPCD: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[    7.118887] [drm] radeon_dp_set_rx_power_state, 0
[    7.118889] [drm] DPCD: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[    7.118891] [drm:radeon_dp_set_rx_power_state] *ERROR* corrupt dpcd,
updating
[    8.254349] [drm:radeon_dp_link_train] *ERROR* corrupt dpcd, updating
[    8.255018] [drm] radeon_dp_link_train
[    8.255019] [drm] DPCD: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[    8.255020] [drm] dp_info dpcd: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[    8.255022] [drm] radeon_dp_set_rx_power_state, 0
[    8.255023] [drm] DPCD: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[    8.255024] [drm:radeon_dp_set_rx_power_state] *ERROR* corrupt dpcd,
updating
[    8.255326] [drm] radeon_dp_getdpcd
[    8.255326] [drm] DPCD: 11 0a 02 00 00 00 00 00 00 00 00 00 00 00 00
[    8.263438] [drm:radeon_dp_link_train_cr] *ERROR* clock recovery tried 5
times
[    8.263440] [drm:radeon_dp_link_train_cr] *ERROR* clock recovery failed
[    8.662772] radeon 0000:00:01.0: fb0: radeondrmfb frame buffer device
[    8.691450] [drm] Initialized radeon 2.40.0 20080528 for 0000:00:01.0 on
minor 0
[   11.436860] [drm] radeon_dp_getdpcd
[   11.436866] [drm] DPCD: 11 0a 84 01 00 0b 01 01 02 00 00 00 00 00 00
[   11.467143] [drm] radeon_dp_getdpcd
[   11.467151] [drm] DPCD: 11 0a 84 01 00 0b 01 01 02 00 00 00 00 00 00
[   11.530015] [drm] radeon_dp_getdpcd
[   11.530021] [drm] DPCD: 11 0a 84 01 00 0b 01 01 02 00 00 00 00 00 00
[   11.558174] [drm] radeon_dp_getdpcd
[   11.558182] [drm] DPCD: 11 0a 84 01 00 0b 01 01 02 00 00 00 00 00 00

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