Comment # 94
on bug 73530
from Nicolas Werner
(In reply to Alex Deucher from comment #93) > Created attachment 115778 [details] [review] [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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