- started with external monitor used in extended mode
- each running on one of the monitors
- on Sandy Bridge
don't support switching to clone mode. One of the glxgears will hang.
The issue will reproduce just starting compiz.
The issue will reproduce following the test step starting compiz.But that did not happen every time.At most of time, it can switch to clone mode and one of glxgears will black-screen.
Kernel: (drm-intel-fixes) 3f8ff0e72d75fdbe7f2cba2c4015fd9fdd9e13fd
Created attachment 40139 [details]
Created attachment 40140 [details]
Tests on intel workshop show:
Apparently this is fixed with the newest bits. Presumably a DRM issue.
per comment# 5, otherwise, please reopen, Gordon.
The issue is still there. The reproduce step is as below:
2,switch two monitors to extended mode with xrand.
3,run 2 glxgears.
4,ensure each glxgears running on one of the monitors.
5,switch to cloned mode. Then one of the glxgears turn to black.
1, the compiz is not necessary
2, If exchange step 2 and step 3, the issue disappeared.
The issue is fixed for us. Maybe you're using an old driver stack.
Zhenyu, can you reproduce this?
We can file a new bug if needed. I think Yi's stack new enough.