I'd assume "AMD A8-7600 with onchip Radeon R7" uses the separate radeonSI mesa
driver and may not have this problem reported in this bug. Notice the bug is
against R600 driver.

I asked about the radeonSI drive in comment 6 but didn't get a reply. If you
could find out if you are running with it and rendering is fine, I would like
to know.