There is an issue which we are observing with Parade LSPCON on KBL NUCs. Parade LSPCON forgets to turn off scrambling/bit clock rate when switching from a mode that needs them to a mode that does not. This manifests as a "no signal" followed by black screen on TV when tried to go from 4k to 1080p for example. If SCDC register manually poked over DDC, picture appears. Here's the OUI/fw revision for the LSPCON chip in question: DP branch: OUI 00-1c-f8 dev-ID 175IB0 HW-rev 1.0 SW-rev 7.32 quirks 0x0000 Connector Info: DP branch device present: yes Type: HDMI ID: 175IB0 HW: 1.0 SW: 7.32 Max TMDS clock: 600000 kHz Max bpc: 12 Issue has also been reproduced on KBL RVP + LSPCON chip as an external adaptor. OUI/fw revision for the LSPCON chip: DP branch: OUI 00-1c-f8 dev-ID 175IB0 HW-rev 1.2 SW-rev 7.35 quirks 0x0000 Connector Info: DP branch device present: yes Type: HDMI ID: 175IB0 HW: 1.2 SW: 7.35 Max TMDS clock: 600000 kHz Max bpc: 12
Issue is resolved after getting the latest fw from parade (SW:7.64) Testing done on KBL NUC. Resolving->Closing.
If we don't have a Linux firmware flasher that can be used by normal people this is still a problem.
Agree, we can update on CI but cannot close until FW available for masses.
Swati, please check if helped on CI? 2 systems got this update.
This issue was not caught on CI. Locally I have tested, issue not reproducible with new FW.
@Swati, can we close this issue?
As, Ville mentioned till the time we don't have Linux firmware flasher this is still a problem. Don't know about status of fw flasher.
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