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: d...@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.
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