#1201 - Black window with KDE5 plasma

X2Go Bug report logs - #1201
Black window with KDE5 plasma

Reported by: Klaus Fuerstberger <linuxbox@arcor.de>

Date: Fri, 18 Aug 2017 10:35:01 UTC

Severity: normal

Merged with 892

Found in versions 4.1.0.0-0x2go1.2, 4.0.1.19-3.fc22

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Subject: Re: Black window with KDE5 plasma
To: Klaus Fuerstberger <linuxbox@arcor.de>, 1201@bugs.x2go.org
References: <730dff47-1a1b-a7a0-3f05-ebd2905ac555@arcor.de>
 <handler.1201.B1201.15037575439869.ackinfo@bugs.x2go.org>
 <1a3dea91-6f46-091c-52df-80277c28dde2@arcor.de>
 <9376ae1f-5ea3-0c0d-f3ce-969dc2036276@ionic.de>
 <573978bc-4d55-ff42-4a8c-8276f037d616@arcor.de>
From: Mihai Moldovan <ionic@ionic.de>
Message-ID: <b608fe5c-3924-38e1-b811-df1e4562f167@ionic.de>
Date: Sun, 3 Sep 2017 08:30:07 +0200
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[Message part 1 (text/plain, inline)]

On 09/01/2017 12:42 PM, Klaus Fuerstberger wrote: > The nvidia driver installer removes the conflicting mesa drivers and > especially /usr/lib/x86_64-linux-gnu/libGL.so.1.2.0 > > If I backup this library bevor installing the nvidia driver and change > one symbolic link pointing to the systems library then x2go works fine. Are you really using the nVidia installer package? You shouldn't do that. Instead, use the packages your distribution provides. They do things differently and more importantly correct from a distribution viewpoint. For instance, they won't be removing MESA's libGL version. Debian (and probably thus also Ubuntu) uses its alternatives system to select the libraries provided by different implementations, one of which is nVidia. I don't know how it's done on other systems, but they probably do something like that as well. > Of course this workaround does not function, when started with the x2go > Xsession, because the user has no write permissions in > /usr/lib/x86_64-linux-gnu. > > I wonder why x2go worked bevor with KDE4 and the nvidia drivers. No idea, but software changes. Maybe nVidia's libGL was just compatible enough to work previously, but now isn't. In any case, we never intended to use anything but MESA's libGL. Just today I've had a report of a user that all Qt5-based applications didn't work any longer on his system (Debian Buster). Turned out that the nvidia drivers were installed and that this was the culprit. When we switched to MESA's implementation via sudo update-alternatives --set glx /usr/lib/mesa-diverted, things started to work again. Sadly, while this might fix X2Go sessions, it's not a viable option for users who also want to use their machines directly. Also, sadly, I didn't yet come up with any means of overriding libGL and whatever other library is being switched from X2Go Server's scripts. I'd like to just always force the MESA libraries for X2Go sessions only, but this stuff is rooted deep into the system. Mihai

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X2Go Bug report logs - #1201 Black window with KDE5 plasma

X2Go Bug report logs - #1201
Black window with KDE5 plasma