Created attachment 70837 [details]
output of lspci -v
Using in-kernel DRM with my Radeon HD4870X2, resolutions above 1024x768 no
longer function. Selecting a higher resolution results in a blank, black
screen. Sometimes my monitor reports 'frequency out of range', but usually it
does not. Xorg otherwise functions as normal - if I blindly pull up a terminal
and switch resolution via xrandr, I regain my display. Various combinations of
xorg.conf options, including no xorg.conf at all, do not fix the problem.
This problem surfaced with v3.7.0-rc5, and is not fixed the version of DRM
present in current kernel git (3.7.0-rc7+). The problematic file is
drivers/gpu/drm/radeon/atombios_crtc.c - using the version of this file
included in 3.7.0-rc4 resolves my problem.
Steps to Reproduce:
Install kernel version > 3.7.0-rc4 on relevant hardware
startx
Actual Results:
Blank Screen
Expected Results:
X should display my desktop, rather than shutting off my display.
Platform:
Linux
Xorg 1.8.2*
xf86-video-ati 6.14.1*
libdrm 2.4.26*
mesalib 7.11.1*
* Version of these packages does not appear relevant to this bug
Additional Information:
See attached lscpi for my hardware
dmesg and Xorg.0.log have not been attached, as their output is identical
between working and non-working versions of this file.
I will happily provide any additional information or testing that would help
resolve this bug.