Created attachment 926964 [details] A digital picture of my "black band error" (a screenshot appears to be completely normal with no black band) /-/--/-/--/-/--/-/--/-/--/-/--/-/--/-/--/-/--/-/--/-/--/-/--/-/--/-/--/-/--/-/ Please see original request for help (picture of error and links to dmesg output included) @ http://unix.stackexchange.com/questions/150169/drm-kernel-v3-11-issues Some details have been rewritten here V /-/--/-/--/-/--/-/--/-/--/-/--/-/--/-/--/-/--/-/--/-/--/-/--/-/--/-/--/-/--/-/ Description of problem: When booting into newer kernel versions, a black unhoverable band appears on the screen, splitting it into two unequal parts with the right of the expected screen on the left and vice-versa (see picture unix.stackexchange link for picture) Version-Release number of selected component (if applicable): kernel v3.11.10-301.fc20 working fine (as installed from installation media) kernel v3.15.8 and v3.15.7 produce the error How reproducible: 100% of the time with occasional no display at all (2px tall coloured band at top) Steps to Reproduce: 1.Select a kernel version greater than 3.11.10-301.fc20 from the GRUB2 Boot menu and boot from it 2.NOTE: Kernel efi certificate authentication error display does not yet suffer of black band display error (therefore assumed erroneous kernel module is DRM otherwise potentially the x.org radeon drivers) Actual results: An split screen Expected results: A non split screen Additional info: "-Occasionally, I get no video at all with the newer kernels; merely a 2px tall tripe at the top of my screen that does flash with the right colours (because I know the login so well :P). -Changing GRUB2's gfxpayload setting to 'auto' does nothing" Hardware/BIOS setup AMD 970 chipset (ASUS m5a97 R2.0) AMD FX-6600 AMD Radeon 6450 discrete graphics(Gigabyte silent edition) Booting shim.efi (secure boot) dmesg outputs: 3.15 (black band present as per picture). Link: http://1drv.ms/1uR67om 3.11 (black band not present): http://1drv.ms/1uR5Sd3
Created attachment 926976 [details] dmesg output of a boot 3.11 kernel (no black band)
Created attachment 926977 [details] dmesg output of a booted 3.15.8 kernel
Created attachment 926978 [details] dmesg output of a booted 3.15.8 kernel
First time formally using bugzilla. Please excuse any lacking of netiquette...
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