Automatic modesetting fails when attaching monitors with some AMD hardware
With some configurations, adding an additional monitor to a system using AMD hardware can fail to activate the new hardware automatically.
The problem is currently under investigation.
To workaround the issue, system administrators should manually call xrandr(1) to enable the monitor.
Description of problem:
Upon hotplug of a new monitor, the ddx does not get a modeset request to light up the new display. Manually running xrandr is required to light it up.
Steps to Reproduce:
1. Hotplug a new display
The new display will light up.
This came up during QA for our amdgpu-pro driver. We are not seeing a modeset request. I think gnome-settings-daemon or the xserver may be dropping the randr event. The monitor shows up as connected in the xrandr output and can be enabled by running xrandr to manually light it up. We did not see this issue with older versions of RHEL.
From the call this worked correctly on a previous release of RHEL? Please confirm the most recent release of RHEL this worked correctly.
Please attach a sosreport from a system directly after seeing this issue?
I just confirmed this is a regression from RHEL 7.2.
Created attachment 1221595 [details]
RHEL7.2 sos report
Created attachment 1221596 [details]
RHEL 7.3 sos report
I wasn't aware of the issue until today, so no.
Created attachment 1288113 [details]
Alex, would it be possible for you to test this scratch build? It's for rhel 7.4 so you need to install the beta plus this rpm.
This will not be able to make RHEL 7.4. This is now requested for RHEL 7.5.
*** Bug 1366169 has been marked as a duplicate of this bug. ***
Waiting on test feedback from customer, so clearing need-info flag.
Please confirm if you are still seeing this issue on RHEL 7.4?
(In reply to Joseph Kachuck from comment #21)
> Hello Alex,
> Please confirm if you are still seeing this issue on RHEL 7.4?
> Thank You
> Joe Kachuck
Note that there is a test build in comment 16
I can confirm hotplug is working properly on 7.3. Haven't had a chance to test 7.4 yet.
From the last update. I am closing this BZ as current release. Please reopen if required.