Comment # 4 on bug 90926 from Michel Dänzer

(In reply to Artivision from comment #3)
> Nothing has been logged into /var/log/dmesg.

How about /var/log/kern.log*?

> Do you need "dmesg | grep -i 'something'"?

Just the unfiltered output of dmesg, if the above doesn't help. Might be worth
capturing that once already before reproducing the problem, in case doing so
fills up the kernel message ring buffer.