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At least on a Lenovo X220 the HPD bits of this are enabled at boot but cleared after resume, which means plug interrupts stop working. This also happens to fix DP displays re-lighting on resume. I'm quite certain that's an accident: the first DP link train inevitably fails on that machine, and it's only serendipity that we're getting multiple plug interrupts and the second train works. But I shall take my victories where I get them. Signed-off-by: Adam Jackson <ajax@redhat.com> Tested-by: Keith Packard <keithp@keithp.com> Reviewed-by: Keith Packard <keithp@keithp.com> Signed-off-by: Keith Packard <keithp@keithp.com> |
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