Hi Thomas and Jammy,
I've got a regression report, and it's caused by
https://patchwork.freedesktop.org/patch/540015/
On this ast2600 server, the firmware says it has a DP output, but
physically, there is only one VGA output.
Before this commit, "ast->tx_chip_types |= BIT(AST_TX_ASTDP)" means it
will have both VGA and DP configured, but after this changed to
"ast->tx_chip_types = AST_TX_ASTDP_BIT" and the VGA connector disappear.
The EDID of the VGA monitor is not read anymore, and a wrong resolution
is setup causing a blank screen.
Of course fixing the firmware would be the best solution, it's not
always possible.
I'm considering different options:
- Add a kernel module parameter to override the tx_chip_types, something
like "ast.output=vga"
- Add a DMI quirk, to force vga on this particular motherboard.
What do you think?
Best regards,
--
Jocelyn
