On 04.12.2015 10:43, Boszormenyi Zoltan wrote: > 2015-12-04 09:53 keltezéssel, Christian König Ãrta: >> On 04.12.2015 00:26, cpaul at redhat.com wrote: >>> From: Lyude <cpaul at 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 at 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 at 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.
No, at least active converter cables are a completely different case. Regards, Christian. > > Inquiry-by: Zoltán Böszörményi <zboszor at pr.hu> > ;-) > > Thanks in advance. >
