Comment # 74
on bug 79980
from jackdachef@gmail.com
(In reply to comment #71) > This bug was originally about a stability regression due to some GPUVM > changes in 3.15. If 3.14 is stable for you but newer kernels are not, then > it may be related. Otherwise, it's probably another issue. See bug 81644 > about stability issues with Chromium specifically. unfortunately 3.14 also isn't entirely stable it mostly is (99%) but here the problem is that very very seldomly X simply crashes, gpu doesn't simply turn black and recovers, so important data can be lost (when being worked on) - couldn't pinpoint the reason yet - the gpu just "reboots" no additional error messages dmesg or Xorg.0.log as far as I know can't say anything about kernel versions prior to that since this card is still a few days old gcc 4.9 also couldn't be the cause, at least with 3.16-rc* kernels and drm-next-3.17-rebased-on-fixes, since I've already added the patch manually and the kernel also isn *NOT* compiled with -Os (optimize for size) it seems to be more of general instability going towards 3.15 and 3.16 - but who I am to ask, I'm just a enthusiast user :P having read about stability issues with the new firmware somewhere how could I test and revert to the old firmware ? would it still work ? simply removing the PITCAIRN_mc2.bin (e.g. for the R9 270X) and leaving the other PITCAIRN files in /lib/firmware ? the graphics driver is loading as a module and not compiled into the kernel or included in initramfs I'd really like to upgrade to 3.16-rc* due to recent changes (especially in connection with Btrfs) an option to disable UVD entirely would have been nice (when still using 5850 and during the new introduction of DPM there was a patch which offered a module parameter to turn it manually off) - would that be an option to further troubleshoot this issue and to exclude UVD from the list of potential causes ? Thanks
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