Since 3.17-rc1 my radeon card (RV370 / X1050 card) causes screen corruption after a while in X + firefox. This still occurs with yesterday's HEAD of Linus' repo. 3.16 and ealier kernels are fine.
I ran a bisect, which identified:
commit 72a9987edcedb89db988079a03c9b9c65b6ec9ac Author: Michel Dänzer michel.daenzer@amd.com Date: Thu Jul 31 18:43:49 2014 +0900
drm/radeon: Always flush the HDP cache before submitting a CS to the GPU
as the cause of my screen corruption. Reverting this from 3.17-rc2 (which requires manual intervention due to subsequent changes in radeon_ring_commit()) eliminates the screen corruption.
User-space is vanilla Fedora 19 / x86_64 with updates. radeon_drv.so says:
[ 62.574] (II) LoadModule: "radeon" [ 62.574] (II) Loading /usr/lib64/xorg/modules/drivers/radeon_drv.so [ 62.574] (II) Module radeon: vendor="X.Org Foundation" [ 62.574] compiled for 1.14.0, module version = 7.1.99 [ 62.574] Module class: X.Org Video Driver [ 62.574] ABI class: X.Org Video Driver, version 14.1 ... [ 62.585] (--) RADEON(0): Chipset: "ATI Radeon X550 (RV370) 5B63 (PCIE)" (ChipID = 0x5b63)
See also my original report to LKML: http://marc.info/?l=linux-kernel&m=140829066726743&w=2
/Mikael