On Fri, Apr 13, 2012 at 11:41 AM, Takashi Iwai <tiwai@xxxxxxx> wrote: > At Fri, 13 Apr 2012 11:30:01 -0400, > Alex Deucher wrote: >> >> On Fri, Apr 13, 2012 at 11:13 AM, Takashi Iwai <tiwai@xxxxxxx> wrote: >> > At Fri, 13 Apr 2012 15:35:04 +0100, >> > Dave Airlie wrote: >> >> >> >> > I don't think we need to support all wild modes, too. But the _very_ >> >> > common modes like 1366x768 and 1600x900 should be really supported as >> >> > default. >> >> >> >> You guys still haven't answered the basic question, what HW is this broken? >> > >> > The reported problem is about HP laptops with i915 driver (no matter >> > chip chip is) and several monitors with resolutions more than the >> > laptop panel. >> > >> > The LVDS provides only the native resolution (either 1366x768 or >> > 1600x900) and a few other VESA ones (1024x768, 800x600 and 640x480). >> > Meanwhile, the monitor EDID doesn't provide such laptop-native >> > resolutions. >> > Thus, in clone mode, the only possible resolution is 1024x768 or >> > lower. That's the whole problem. It's too low and doesn't match with >> > 16:9 although both laptop and monitor panels are 16:9. >> > >> > HP wants the clone mode of the laptop-native resolution and/or a >> > higher resolution with the right aspect ratio like 1280x720. Neither >> > work as of now unless you add the extra mode manually. >> > >> >> One thing to be careful of is that some monitors (especially LCD >> panels) don't like modes that are not in their EDIDs. As such when >> you try and set them you often get a wonky display or more often a >> blank screen. We used to add a lot of inferred modes to the mode list >> in the xserver which resulted in a lot of blank screens when some odd >> mode was picked as the best match for a cloned display. The "fix" was >> to only add the inferred modes on analog monitors which were more >> likely to be able to support them. > > Thanks, it's good to know! > > Though, I still wonder whether adding inferred modes for 1366x768 or > 1600x900 would cause any big problems. On such monitors, 1360x768 or > 1440x900 (or 1680x1050) are usually seen in the supported list. > > Of course, it's never 100% safe. But not so bad odds? Probably ok on recent LCD panels as long as rb cvt modes are mostly used. Just something to keep in mind. Alex _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
