Public bug reported:
I own an HP LP3065 monitor (http://www.amazon.com/dp/B000KB6E3G/) with a
BizLink displayport adapter (http://www.amazon.com/dp/B003XYBA72/). The command
"sudo get-edid -b 6 | parse-edid" correctly identifies the available
resolutions of the screen as 2560x1600 and 1280x800. However, the Ubuntu system
incorrectly identifies instead the resolutions 1024x768, 800x600, 848x480, and
640x480 which all don't work with the monitor. While I have to add manually the
correct resolutions with xrandr using the command "xrandr --newmode 2560x1600
268.00 2560 2608 2640 2720 1600 1603 1609 1646 -hsync +vsync && xrandr
--addmode DP1 2560x1600", I occasionally have the system attempting to use the
1024x768 resolution leading to an empty black screen. One potential solution
would be to remove the rogue resolutions so that they could not be
automatically chosen. I tried the command "xrandr --delmode DP1 1024x768" but
this is to no avail with the following output:
X Error of failed request: BadAccess (attempt to access private resource
denied)
Major opcode of failed request: 140 (RANDR)
Minor opcode of failed request: 19 (RRDeleteOutputMode)
Serial number of failed request: 42
Current serial number in output stream: 43
My understanding is that the system thinks to know better than the user and
disallows from removing native resolutions. However, it is clear that the
system is not designed well enough to know what the correct native resolutions
are. This is tremendously frustrating and ultimately it is combination of a bug
in properly detecting the native resolutions (gone unfixed for the last five
years) and a flawed design assuming detected resolutions would never need to be
removed. I am at a loss with regard who to and where to file this bug. I would
be tremendously grateful to anybody who could provide some directions.
** Affects: x11-xserver-utils (Ubuntu)
Importance: Undecided
Status: New
** Tags: xrandr
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https://bugs.launchpad.net/bugs/1437091
Title:
xrandr --delmode unable to remove incorrectly detected video
resolution modes
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