This bug affects me, too. I suspect libdrm update did this. (I am not sure though). They updated this package in order for changes HWE kernel (see http://changelogs.ubuntu.com/changelogs/pool/main/libd/libdrm/libdrm_2.4.91-2~16.04.1/changelog ) - but some people (including me) still use the GA kernel (4.4). The GA kernel should be supported for the entire lifespan of Ubuntu 16.04, so the graphics shouldn't be broken.
This bug affects me, too. I suspect libdrm update did this. (I am not sure though). They updated this package in order for changes HWE kernel (see http:// changelogs. ubuntu. com/changelogs/ pool/main/ libd/libdrm/ libdrm_ 2.4.91- 2~16.04. 1/changelog ) - but some people (including me) still use the GA kernel (4.4). The GA kernel should be supported for the entire lifespan of Ubuntu 16.04, so the graphics shouldn't be broken.