2015-12-04 09:53 keltezéssel, Christian König írta:
On 04.12.2015 00:26, cpaul@redhat.com wrote:
From: Lyude cpaul@redhat.com
HPD signals on DVI ports can be fired off before the pins required for DDC probing actually make contact, due to the pins for HPD making contact first. This results in a HPD signal being asserted but DDC probing failing, resulting in hotplugging occasionally failing.
This is somewhat rare on most cards (depending on what angle you plug the DVI connector in), but on some cards it happens constantly. The Radeon R5 on the machine used for testing this patch for instance, runs into this issue just about every time I try to hotplug a DVI monitor and as a result hotplugging almost never works.
Rescheduling the hotplug work for a second when we run into an HPD signal with a failing DDC probe usually gives enough time for the rest of the connector's pins to make contact, and fixes this issue.
Signed-off-by: Lyude cpaul@redhat.com
I find a second a bit long, but if it works so what?
Looks sane enough to me, patch is Reviewed-by: Christian König christian.koenig@amd.com
Does this patch help in case of the Radeon chip only has HDMI and DP outputs exposed (Zotac ZBOXNANO-AQ01) but used with DVI or VGA monitors with converter cables? We have some problems with such scenarios that sounds eerily similar to this description.
Inquiry-by: Zoltán Böszörményi zboszor@pr.hu ;-)
Thanks in advance.