It is the truth the problem arised after mesa or kernel update, not after Xorg update. I am not sure but I give higher probability to mesa. Kernel updated on Jan 12-th (to 4.3.3-300 which I was running when problem arised first time), mesa on Jan 16-th. I am sure I had not this problem before Jan 12-th. I am not sure whether I had it between Jan 12-th and Jan 16-th.
Hardware:
Capabilities: <access denied>
01:00.0 VGA compatible controller: NVIDIA Corporation GT218 [GeForce 210] (rev a2) (prog-if 00 [VGA controller])
Subsystem: ASUSTeK Computer Inc. EN210 SILENT
Flags: bus master, fast devsel, latency 0, IRQ 45
Memory at fd000000 (32-bit, non-prefetchable) [size=16M]
Memory at c0000000 (64-bit, prefetchable) [size=256M]
Memory at d0000000 (64-bit, prefetchable) [size=32M]
I/O ports at e000 [size=128]
Expansion ROM at fe000000 [disabled] [size=512K]
Kernel driver in use: nouveau
Kernel modules: nouveau
Kernel: fc23.x86_ 64 #1 SMP Fri Jan 15 14:03:17 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
Linux marek.grepo.lan 4.3.3-301.
Mesa: drivers- 11.1.0- 2.20151218. fc23.i686
mesa-dri-
It is the truth the problem arised after mesa or kernel update, not after Xorg update. I am not sure but I give higher probability to mesa. Kernel updated on Jan 12-th (to 4.3.3-300 which I was running when problem arised first time), mesa on Jan 16-th. I am sure I had not this problem before Jan 12-th. I am not sure whether I had it between Jan 12-th and Jan 16-th.