Re: [Intel-gfx] [PATCH] drm/i915: Fix LSPCON TMDS output buffer enabling from low-power state

On Mon, 16 Apr 2018, Clint Taylor wrote: > On 04/16/2018 08:53 AM, Imre Deak wrote: >> LSPCON adapters in low-power state may ignore the first I2C write during >> TMDS output buffer enabling, resulting in a blank screen even with an >> otherwise enabled pipe. Fix this

Re: [Intel-gfx] [PATCH] drm/i915: Fix LSPCON TMDS output buffer enabling from low-power state

On Mon, Apr 16, 2018 at 06:53:09PM +0300, Imre Deak wrote: > LSPCON adapters in low-power state may ignore the first I2C write during > TMDS output buffer enabling, resulting in a blank screen even with an > otherwise enabled pipe. Fix this by reading back and validating the > written value a few

Re: [Intel-gfx] [PATCH] drm/i915: Fix LSPCON TMDS output buffer enabling from low-power state

On 04/16/2018 08:53 AM, Imre Deak wrote: LSPCON adapters in low-power state may ignore the first I2C write during TMDS output buffer enabling, resulting in a blank screen even with an otherwise enabled pipe. Fix this by reading back and validating the written value a few times. The problem

[Intel-gfx] [PATCH] drm/i915: Fix LSPCON TMDS output buffer enabling from low-power state

LSPCON adapters in low-power state may ignore the first I2C write during TMDS output buffer enabling, resulting in a blank screen even with an otherwise enabled pipe. Fix this by reading back and validating the written value a few times. The problem was noticed on GLK machines with an onboard