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.
SHould be fixed with: http://cgit.freedesktop.org/~agd5f/linux/commit/?h=drm-fixes-3.7&id=fc58acdbf153f12783b80cb19c04cc9de121b518 Which will be upstream soon.
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