Comment # 101
on bug 73530
from Alex Deucher
Created attachment 115801 [details] [review] leave panel power on all th time (In reply to Nicolas Werner from comment #98) > [ 5.722365] [drm:radeon_dp_set_link_config] *ERROR* corrupt dpcd, updating > [ 5.722952] [drm] radeon_dp_set_link_config, ffff8802a1878c00, 540000, 1 > [ 5.722953] [drm] dig_connector ffff8802a335fd60 > [ 5.722954] [drm] DPCD: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > [ 6.865341] [drm:radeon_dp_set_rx_power_state] *ERROR* corrupt dpcd, > updating > [ 6.865932] [drm] radeon_dp_set_rx_power_state, ffff8802a1878c00, 0 > [ 6.865933] [drm] dig_connector ffff8802a335fd60 > [ 6.865934] [drm] DPCD: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > [ 8.001613] [drm:radeon_dp_link_train] *ERROR* corrupt dpcd, updating > [ 8.002284] [drm] radeon_dp_link_train, ffff8802a1878c00 > [ 8.002285] [drm] dig_connector ffff8802a335fd60 > [ 8.002287] [drm] DPCD: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > [ 8.002287] [drm] dp_info dpcd: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > 00 For some reason the DPCD reads back unreliably. It's all zeros the first few times. > [ 8.002289] [drm:radeon_dp_set_rx_power_state] *ERROR* corrupt dpcd, > updating > [ 8.002594] [drm] radeon_dp_getdpcd ffff8802a1878c00 > [ 8.002595] [drm] dig_connector ffff8802a335fd60 > [ 8.002595] [drm] DPCD: 11 0a 02 00 00 00 00 00 00 00 00 00 00 00 00 Finally it reads back correctly, but at this point it's too late. > [ 8.002597] [drm] radeon_dp_set_rx_power_state, ffff8802a1878c00, 17 > [ 8.002598] [drm] dig_connector ffff8802a335fd60 > [ 8.002599] [drm] DPCD: 11 0a 02 00 00 00 00 00 00 00 00 00 00 00 00 > [ 8.010706] [drm:radeon_dp_link_train_cr] *ERROR* clock recovery tried 5 > times > [ 8.010707] [drm:radeon_dp_link_train_cr] *ERROR* clock recovery failed Does this patch help the reliability any?
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