[Bug 27470] Dual link DVI mode (2560x1920) on Dell 30" display unusable (distorted screen) on RV770 [Radeon HD 4850]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=27470

--- Comment #18 from nine at detonation.org 2011-02-05 03:52:27 PST ---
Created an attachment (id=42960)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=42960)
dmesg output of a drm-fixes kernel with the following (useless) patch, showing
failure to detect DP output

diff --git a/drivers/gpu/drm/radeon/atombios_dp.c
b/drivers/gpu/drm/radeon/atombios_dp.c
index 695de9a..a8c23c6 100644
--- a/drivers/gpu/drm/radeon/atombios_dp.c
+++ b/drivers/gpu/drm/radeon/atombios_dp.c
@@ -356,7 +356,8 @@ retry:
        atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t
*)&args);

        if (args.v1.ucReplyStatus && !args.v1.ucDataOutLen) {
-               if (args.v1.ucReplyStatus == 0x20 && retry_count++ < 10)
+              if (args.v1.ucReplyStatus != 3 && retry_count++ < 2000)

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