[Bug 72167] radeonsi/KMS: Displayport mode detected incorrectly

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Wed Dec 11 08:31:07 PST 2013


--- Comment #11 from Alex Deucher <agd5f at yahoo.com> ---
(In reply to comment #10)
> I don't have any other adapters.
> What I don't get is: The BIOS displays correctly on the DP outputs, which
> implies that the card knows the correct EDID data, right?

If the bios is able to bring up the monitors it should work.  The monitor is
deferring the transaction.  You might try increasing the number of retries. 
E.g., something like:

diff --git a/drivers/gpu/drm/radeon/atombios_dp.c
index fb3ae07..5bc5edc 100644
--- a/drivers/gpu/drm/radeon/atombios_dp.c
+++ b/drivers/gpu/drm/radeon/atombios_dp.c
@@ -272,7 +272,7 @@ int radeon_dp_i2c_aux_ch(struct i2c_adapter *adapter, int

-       for (retry = 0; retry < 4; retry++) {
+       for (retry = 0; retry < 16; retry++) {
                ret = radeon_process_aux_ch(auxch,
                                            msg, msg_bytes, reply, reply_bytes,
0, &ack);
                if (ret == -EBUSY)

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