On 8/27/12 4:34 PM, Alex Deucher wrote:
On Mon, Aug 27, 2012 at 4:24 PM, Adam Jackson <ajax@xxxxxxxxxx> wrote:
Paul's FORCE_REDUCED_BLANKING series makes me nervous about what those
monitors will do over VGA, since from a conversation we had on IRC he hasn't
been able to test that.
I asked the closed driver display team about these to see if we had
any generic rules for whole classes of monitors and they do not. They
keep a small database of displays that need special tweaking and then
have a set of options that can be enabled by the user (always use
CVT-RB rather than GTF, etc.). There's no generic solution since EDID
1.3 doesn't give us enough info to really enable generic rules on
whole classes of monitors and most VGA connectors still use EDID 1.3
with no extension blocks. EDID 1.4 is better, but few VGA connectors
on monitors uses it. Other than that, they also rely on the EDID.
I really wish there were a useful way to identify the display controller
on the other end. DDC/CI will give it to you, kind of, but any monitor
that supports CI probably doesn't need quirking, at least not at this level.
Paul's series does pick specific vendor/model IDs as much as it can, but
when the model is "0" one is a little wary about whether the vendor
bothers to set the model ID meaningfully at all.
- ajax
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