At a customer, I encountered an interesting issue with Citrix Workspace App on IGEL OS.
The symptoms:
In a multi-monitor configuration, individual Citrix windows occasionally misbehaved. The session itself generally worked, but the logs showed X11 errors such as:
BadWindow
BadDrawable
BadGC
After some investigation, I narrowed the issue down to the interaction between IGEL OS, Citrix Workspace App and X11 window handling.
One interesting parameter provided by IGEL for Citrix Workspace App is:
app > cwa > wfclient > thinwire30 > ignorexerrors
Specific X11 errors can be ignored there using values such as
20.0/3, 55.0/9, 60.0/13
.
This mitigated the behavior in my case.
But be careful: this is not a true fix for the underlying cause.
IgnoreXErrors causes the relevant X11 errors to be ignored. These errors also stop appearing in the logs.
That must be considered during troubleshooting. A clean log afterwards does not automatically mean the underlying cause has disappeared.
My learning from this case:
If Citrix generally works on an IGEL endpoint but unusual window issues occur, particularly with multiple monitors, examine the CWA/X11 logs.
BadWindow, BadDrawable or BadGC can be useful clues.
And before dismantling the VDA, HDX Graphics or the entire Citrix infrastructure:
Check the endpoint first. 😉