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I have an old Xorg server whose "Render" extension seems to be buggy (if enabled, most of the fonts are invisible, unless hovering over them -- after upgrading the packages with X clients and libraries).

So, the problem is solved for new instances of the Xorg server by adding to /etc/X11/xorg.conf:

Section "Extensions" Option "RENDER" "Disable" EndSection 

But what if I want to continue an X session, but make new clients not use the extension? (Of course, logically, old clients can't be made not to use it; but what about new ones?) Some options are:

1. Can I turn one of the server's extension off on the fly, while the server is running?
2. Can I tell the clients not to use it (e.g., those written with a specific toolkit)?
3. IS there an "X proxy" which could be used for my goal: the proxy could simply not advertise that it has a "Render" extension, or translate the requests that involve it, and forward everything to the "physical" X server, and my new clients would then connect to the proxy's DISPLAY.

I have an old Xorg server whose "Render" extension seems to be buggy (if enabled, most of the fonts are invisible, unless hovering over them -- after upgrading the packages with X clients and libraries).

So, the problem is solved for new instances of the Xorg server by adding to /etc/X11/xorg.conf:

Section "Extensions" Option "RENDER" "Disable" EndSection 

But what if I want to continue an X session, but make new clients not use the extension? (Of course, logically, old clients can't be made not to use it; but what about new ones?) Some options are:

1. Can I turn one of the server's extension off on the fly, while the server is running?
2. Can I tell the clients not to use it (e.g., those written with a specific toolkit)?
3. IS there an "X proxy" which could be used for my goal: the proxy could simply not advertise that it has a "Render" extension, or translate the requests that involve it, and forward everything to the "physical" X server, and my new clients would then connect to the proxy's DISPLAY.

I have an old Xorg server whose "Render" extension seems to be buggy (if enabled, most of the fonts are invisible, unless hovering over them -- after upgrading the packages with X clients and libraries).

So, the problem is solved for new instances of the Xorg server by adding to /etc/X11/xorg.conf:

Section "Extensions" Option "RENDER" "Disable" EndSection 

But what if I want to continue an X session, but make new clients not use the extension? (Of course, logically, old clients can't be made not to use it; but what about new ones?) Some options are:

1. Can I turn one of the server's extension off on the fly, while the server is running?
2. Can I tell the clients not to use it (e.g., those written with a specific toolkit)?
3. IS there an "X proxy" which could be used for my goal: the proxy could simply not advertise that it has a "Render" extension, or translate the requests that involve it, and forward everything to the "physical" X server, and my new clients would then connect to the proxy's DISPLAY.

I have an old Xorg server whose "Render" extension seems to be buggy (if enabled, most of the fonts are invisible, unless hovering over them -- after upgrading the packages with X clients and libraries).

So, the problem is solved for new instances of the Xorg server by adding to /etc/X11/xorg.conf:

Section "Extensions" Option "RENDER" "Disable" EndSection 

But what if I want to continue an X session, but make new clients not use the extension? (Of course, logically, old clients can't be made not to use it; but what about new ones?) Some options are:

1. Can I turn one of the server's extension off on the fly, while the server is running?
2. Can I tell the clients not to use it (e.g., those written with a specific toolkit)?
3. IS there an "X proxy" which could be used for my goal: the proxy could simply not advertise that it has a "Render" extension, or translate the requests that involve it, and forward everything to the "physical" X server, and my new clients would then connect to the proxy's DISPLAY.