Debugging modesetting problem

[Michel Dänzer]

On 2018-03-15 12:52 AM, Jona Stubbe wrote:
> Hi AMD graphics developers,
> 
> I've recently hit a modesetting problem: when I used the DisplayPort KVM 
> switch that I got yesterday to connect my PC (running Arch Linux) to my 4K 
> monitor, it only worked in 3 out of about 60 times of switching/replugging the 
> cable (the BIOS always manages to put something onscreen, though).
> I've tried both graphics cards available to me right now: a Polaris (RX 480) 
> and a Cayman (HD 6950/6970) and neither of them modesets properly and 
> reliably.

With the Polaris card, does enabling DC help? (kernel >= 4.15,
CONFIG_DRM_AMD_DC=y, amdgpu.dc=1 on the kernel command line)


> PS: if there is a shorter-latency way of asking this kind of question (like an 
> IRC channel), I'd be interested too :)

There is #radeon on FreeNode.


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 224 bytes
Desc: OpenPGP digital signature
URL: <https://lists.freedesktop.org/archives/amd-gfx/attachments/20180315/100d76c9/attachment.sig>