Created attachment 115874 [details] Xorg.log 10-bit Switching to 30-bit color depths makes the Xorg server unusable. Created the following section in /etc/xorg.conf.d/99-30bit.conf Section "Screen" Identifier "Screen0" Device "Device0" Monitor "Monitor0" DefaultDepth 30 SubSection "Display" Depth 30 EndSubSection EndSection GUI is very slow, any small animations consume a lot of CPU (Xorg.bin) Name : xorg-x11-server-Xorg Version : 1.16.3 Release : 2.fc21 Architecture: x86_64 Also reported here:https://bugzilla.redhat.com/show_bug.cgi?id=1218321
Have a look at the profiles. Your ddx supports acceleration with that color depth, so something else in the render chain is likely to be doing GetImage/PutImage fallback rendering.
Thanks for spending your time here. Could you please be more explicit on profiles ? Do you mean the problem lies in xorg-x11-drv-intel-2.99.916-3.20141117.fc21.x86_64 ?
I expect that the time spent in Xorg is expected based on the activity of the clients. By profile, start with sudo perf top (record + report for attaching) then narrow down into whether that time is indeed expected (e.g. if it is from GetImage/PutImage or similar, it is the client's fault).
Created attachment 115875 [details] perf top
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