| Bug ID | 98324 |
|---|---|
| Summary | amd-staging-4.7: problems with unblanking displays when monitors are switched off |
| Product | DRI |
| Version | unspecified |
| Hardware | Other |
| OS | All |
| Status | NEW |
| Severity | normal |
| Priority | medium |
| Component | DRM/AMDgpu |
| Assignee | dri-devel@lists.freedesktop.org |
| Reporter | bugspam@moreofthesa.me.uk |
Created attachment 127405 [details]
Kernel log extract, showing the unblanking failure.
Setup: RX 470 with two monitors attached – one via DVI-and one via HDMI. (Both
are AOC monitors.)
* Ensure that outputs are blanked (via xset, time-out or similar).
* Switch off the monitors.
* Unblank the outputs.
* Switch on the monitors.
Invariably, in this situation, the DVI-connected monitor is unblanked and
displaying what it should be, but the HDMI-connected monitor is receiving no
signal (or at least nothing to display) and is therefore displaying nothing.
The HDMI-connected monitor can be restored by using xrandr to change mode or by
blanking and unblanking – so long as it's switched on while doing so.
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