Try reinstalling graphics card drivers is the only thing I can think of. I can't find any evidence of it being reported before which makes me think something is just glitched. Have you restarted since this started happening?
Note: it's not a cvar, but an error option from the renderer gl.
ive traveled 3 hrs to peoples house to find out they didn't have batteries in the remote to turn their gas fireplace on... lol so you charge them $200 for 3 AA batteries.
Did you try removing your configs?
What looks suspisious to me is "MODE: -1, 0 x 0 windowed hz:60" - maybe OGL refuses to create window with 0 x 0 res? IDK if this log should look like that, maybe it's normal though.