[KRdp] [Bug 489097] krdpserver crashes when a connection comes from Remote Desktop Windows 11

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https://bugs.kde.org/show_bug.cgi?id=489097

--- Comment #7 from dalewyn at gmail.com ---
(In reply to Mike Smith from comment #6)
> (In reply to dalewyn from comment #5)
> > (In reply to Mike Smith from comment #4)
> > > Hey Gaël would you mind sharing your RDP setting for the client? I ask
> > > because I can connect from WIndows 11 and Windows 10 RDP client but only if
> > > "Persistent bitmap caching" is turned off on the client. 
> > > 
> > > You can find that setting if you click on the "Show Options" dropdown and go
> > > to the Experience tab of Remote Desktop Connection (clinet side).
> > > 
> > > Can you confirm if that is active or inactive in your test?
> > 
> > Not Gael, but I followed your suggestion and got a different error code
> > about a protocol error on my Windows 11 RDP client.
> > Googling that led me to a suggestion to drop the color resolution down.
> > 
> > So after disabling bitmap caching as you suggested and dropping the color
> > resolution down from 32-bit to 16-bit, I got it to connect. The actual video
> > feed looks like garbage, but it does work in a very janky sense.
> 
> Ok I've seen this before also. This time it's server side. 
> 
> On your krdp server in Fedora what do you have the "video quality" set to? I
> suspect it's in the middle? Set it to the highest quality. You should then
> be able to connect with 32-bit colour on the client. 
> 
> Report back :)

Huh... I admit I didn't see that Video Quality bar until you mentioned it.
Maybe I'm getting too old for this. :V

Setting that to max did indeed allow me to connect at 32-bit.

Getting it to connect is a bit flaky though, it seems fairly random whether I
get a protocol error or not. I've seen this both with 32-bit and 16-bit color
earlier.

I might get around to digging into journalctl and gdb again to see if I can
find something interesting, but it's late night here so that will have to wait
for another day. :V

Thanks a lot for the suggestions. I hope KRDP will better support Windows RDP
(or at least prominently recommend certain configurations) going forward.

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