https://bugs.freedesktop.org/show_bug.cgi?id=57741
Priority: medium Bug ID: 57741 Assignee: dri-devel@lists.freedesktop.org Summary: [regression] Resolution crippled for HD4870X2 Severity: major Classification: Unclassified OS: Linux (All) Reporter: dev@blackshard.net Hardware: x86-64 (AMD64) Status: NEW Version: unspecified Component: DRM/Radeon Product: DRI
Created attachment 70837 --> https://bugs.freedesktop.org/attachment.cgi?id=70837&action=edit 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.