On Sun, 26 May 2019, Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxx> wrote:
> Hi all,
>
> I've a workstation which has internal VGA that is detected as AST 2400 and
> with it EDID has been always quite flaky (except for some time it worked
> with 4.14 long enough that I thought the problems would be past until the
> problems reappeared also with 4.14). Thus, I've provided manually the EDID
> that I extracted from the monitor using other computer (the monitor itself
> worked just fine on the earlier computer so it is likely fine).
>
> I setup the manual EDID using drm_kms_helper.edid_firmware, however,
> after upgrading to 4.19.45 it stopped working (no "Got external EDID base
> block" appears in dmesg, the text mode is kept in the lower res mode, and
> Xorg logs no longer dumps the EDID info like it did with 4.14). So I guess
> the EDID I provided manually on the command line is not correctly put into
> use with 4.19+ kernels.
>
> The 4.19 dmesg indicated that drm_kms_helper.edid_firmware is deprecated
> so I also tested with drm.edid_firmware it suggested as the replacement
> but with no luck (but I believe also the drm_kms_helper one should have
> worked as it was only "deprecated").
>
> I also tried 5.1.2 but it did not work any better (and with it also tried
> removing all the manual *.edid_firmware from the command line so I still
> need to provide one manually to have it reliable working it seems).
This should be fixed by commit
commit 48eaeb7664c76139438724d520a1ea4a84a3ed92
Author: Jani Nikula <jani.nikula@xxxxxxxxx>
Date: Mon Jun 10 12:30:54 2019 +0300
drm: add fallback override/firmware EDID modes workaround
in drm-misc-fixes, cc: stable v4.15.
Thanks for the report.
BR,
Jani.
--
Jani Nikula, Intel Open Source Graphics Center
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