[Bug 105308] X log ballooning in size with "drmmode_wait_vblank failed for scanout update" and "get vblank counter failed"

https://bugs.freedesktop.org/show_bug.cgi?id=105308

--- Comment #7 from Bob Ham rah@settrans.net --- (In reply to Michel Dänzer from comment #6)

Please make sure the problem is actually occurring when you capture the dmesg debugging output.

I've discovered that the problem occurs when the monitor is switched off. With just the monitor off, the "get vblank counter failed: Invalid argument" error appears. With the monitor off while playing a video, both the aforementioned error and "drmmode_wait_vblank failed for scanout update: Invalid argument" appears. I'll attach two kernel logs as instructed, one for each condition.