Xorg display refresh rate settings inaccurate or too conservative
Bug #77205 reported by
Obi Bok
This bug report is a duplicate of:
Bug #3731: Xorg resolution falling back to 640x480 and/or 800x600 when h/v freqs incorrect.
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Affects | Status | Importance | Assigned to | Milestone | |
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xorg (Ubuntu) |
New
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Undecided
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Unassigned |
Bug Description
Binary package hint: xserver-xorg
When going through many filed bugs (#77037, #63026, #61614, #47234, #42880) and forum posts I noticed that many users experience problems with display resolutions and refresh rates set in Xorg. Usually, simply increasing the H/V sync range fixes these issues.
I myself tested this on a BenQ FP731 LCD. Xorg sets HorizSync=28-64, VertRefresh=43-60; while the actual values as per the display manual are 28-81/43-76.
Perhaps Xorg sets these values in a too conservative way, based on the belief that it could damage old CRT monitors? How about implementing an option to extend the range of frequencies?
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Yes, the heuristics in xserver- xorg.postinst. in are approximate at best, and make a number of rather ambitious assumptions. These often work correctly, but sometimes result in bugs such as those reported.
Anecdotal evidence suggests that xorg itself (with no xorg.conf) can do a better job of detection in these circumstances, however this remains to be tested.