https://bugs.freedesktop.org/show_bug.cgi?id=76490
--- Comment #121 from Franc[e]sco lolisamurai@tfwno.gf --- I removed the quirks for my r9 270x and I have no stability issues whatsoever, it's a really nice performance boost.
this is the line I commented out for my card: { PCI_VENDOR_ID_ATI, 0x6810, 0x174b, 0xe271, 85000, 90000 },
and here's full info on my system on this forum post: https://www.phoronix.com/forums/forum/linux-graphics-x-org-drivers/amd-linux...
let me know if you need any more testing on this, but I'm pretty sure it's stable