RADEON DisplayPort - Monitor shows out of range in some modes

Submitted by Jan Burgmeier

Assigned to Default DRI bug account

Link to original bug (#97896)

Description

Created attachment 126733
dmesg output with drm.debug=0x1e log_buf_len=1M

Hi,

I have two monitors connected to my PC one via DVI and one via DP. The monitor connected via DP shows "frequency out of range" when some modes including the preferred one are used. This happens in X and in the KMS framebuffer. For example on the attached logs the preferred mode of 1680x1050 does not work where as 1680x945 works perfectly fine.

Kernel: 4.4.11
Xorg: 1.18.2
xf86-video-radeon: 7.7.0

Last working kernel: 3.19
First broken kernel: 4.0

Here is the bisect info, the 4.0 release segfaulted in the radeon driver but the change which broke this was before so I hope the bisect is right:

first bad commit: [e55bca26188e45f209597abf986c87cc5a49894a] radeon/audio: enable DP audio

After finding the bad commit I tried booting with radeon.audio=0 this made the display work for 3.19 kernel with that commit but did not work for the 4.4.11 kernel.

Attached log files:
- dmesg output with drm.debug=0x1e log_buf_len=1M
- lspci -vv output
- video card bios
- Xorg.0.log
- xrander --verbose output

**Attachment 126733**, "dmesg output with drm.debug=0x1e log_buf_len=1M":
dmesg_output