On 8/27/12 4:34 PM, Alex Deucher wrote:
On Mon, Aug 27, 2012 at 4:24 PM, Adam Jackson ajax@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