I have a "Likom/Aqua/Multiscan" L4011ND monitor. This 14" monitor is working with 1024x768 only at 60Hz. In log file of DDC/EDID this is detected correctly. (II) VIA(0): 640x480@60Hz (II) VIA(0): 640x480@75Hz (II) VIA(0): 800x600@56Hz (II) VIA(0): 800x600@60Hz (II) VIA(0): 800x600@72Hz (II) VIA(0): 1024x768@87Hz (interlaced) (II) VIA(0): 1024x768@60Hz I have tested with recent Ubuntu Flight 7 release. It use other frequency (78 Hz or 75 Hz). In Control Center I can select 75, 70 and 60 Hz. With 60 Hz is work good. Also I try to detect the monitor in Control Center (displayconfig) I get "Plug'n'Play Monitor". May be Xorg also trying select interlace mode frequency at 75 Hz that is first in list of modes, but this card/chip has not supported interlace mode (from messages in log file Xorg.0.log). ******** This bug was submitted in Ubuntu and has also their log files: https://launchpad.net/bugs/29291
Sorry if I selected wrong component in bugzilla, please change to correct component. Thanks
This is a broken EDID block, it reports: (II) VIA(0): Ranges: V min: 47 V max: 104 Hz, H min: 30 H max: 65 kHz, PixClock max 110 MHz Please provide me with the output of get-edid (part of the read-edid package), so that the resulting EDID block can feature on http://people.freedesktop.org/~libv/edid/ Please also use a recent unichrome.sf.net driver version, this will use the edid information more intelligently: it should be interesting to see how it responds to your EDID block; it should choose the same resolution at this time though. A recent unichrome.sf.net will correctly detect the size of your FB memory.
Created attachment 5615 [details] Copy of the log posted at http://librarian.launchpad.net/2582579/Xorg.0.log
Created attachment 5616 [details] Copy of conf posted at http://librarian.launchpad.net/2582581/xorg.conf
Created attachment 5698 [details] Logs of get-edid, xorg.conf and xorg log file I've got output of get-edid. Also I have put option "DumpDDC" en xorg.conf in Monitor and Device section, but in /tmp directory I haven't a LKMxxx.edid file.
In this case monitor has these frequencies: (II) VIA(0): 1024x768@87Hz (interlaced) - I don't know if this is write o wrong (II) VIA(0): 1024x768@60Hz and videochip (or driver) can not support interlaced mode. Xorg must select reshresh rate only of non-interlaced mode - it's all write? Is a problem with "MODEVALIDATION" that pass incorrect mode? Which component of Xorg select best frequency of refresh rate for this case? Is a VIA driver or other component of Xorg? PS: I have free time for my Linux machine only at Saturday :-).
Sorry about the phenomenal bug spam, guys. Adding xorg-team@ to the QA contact so bugs don't get lost in future.
That's not broken. 87Hz interlaced field rate is 43.5Hz frame rate. We pick modes with higher frame rates by default. The driver might not support interlaced modes correctly, but that's not an EDID bug.
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