Re: glxgears needs 100% cpu since update to 256.35
Are you running a composite manager? What processes are using the CPU, besides glxgears? If it's the X server, then it's likely that something is triggering new code that detects when something is listening for Damage events and turns on some fairly expensive damage tracking in OpenGL. Do you see the same behavior if you stop GDM/KDM and just start a bare X server with xinit, then run glxgears from an xterm?