https://bugs.freedesktop.org/show_bug.cgi?id=100387
--- Comment #10 from aceman acelists@atlas.sk --- 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.