On 8/27/12 4:34 PM, Alex Deucher wrote: > On Mon, Aug 27, 2012 at 4:24 PM, Adam Jackson <ajax at redhat.com> 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
