[Bug 82102] 4k monitor edid rejected: EDID timing clock 297.00 exceeds claimed max 115MHz, fixing

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Mon Sep 8 08:05:09 PDT 2014


--- Comment #7 from Wolfgang Rupprecht <wolfgang.rupprecht at gmail.com> ---
(In reply to comment #6)
> You GPU does not support 4k over HDMI.

I assume this was meant for someone else.  My GPU is the Radeon 6450 (card:
Sapphire Radeon HD 6450 1 GB DDR3 HDMI/DVI-D/VGA PCI-Express Graphics Card

The specs at AMD claim this GPU does HDMI 1.4a 2 lanes of 340 Mhz dot clock
each for a total of 640 Mhz.   Even if only one lane is populated on this card,
that should still be 340 Mhz.   The modeline only asks for 297 Mhz.

As for the framebuffer size, xrandr claims this card does a 16k x 16k virtual
buffer.  That too is enough for the  3840 x 2160 screen.   In fact the card
works just fine at 15hz (as evidenced below).   In fact I'm typing this bug
report at 3840x2160 at 15.00.

[wolfgang at capsicum ~]$ xrandr
Screen 0: minimum 320 x 200, current 3840 x 2160, maximum 16384 x 16384
HDMI-0 connected primary 3840x2160+0+0 (normal left inverted right x axis y
axis) 854mm x 481mm
   3840x2160_15.00  14.99* 
   1920x1080     60.00    50.00    59.94    24.00    23.98  
   1920x1080i    60.00    50.00    59.94  
   1440x900      59.89  
   1280x960      60.00  
   1280x720      60.00    50.00    59.94  
   1440x576i     50.00  
   1024x768      75.08    70.07    60.00  
   1440x480i     60.00    59.94  
   800x600       72.19    75.00    60.32  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       75.00    72.81    60.00    59.94  
   720x400       70.08  
DVI-0 disconnected (normal left inverted right x axis y axis)
VGA-0 disconnected (normal left inverted right x axis y axis)
[wolfgang at capsicum ~]$ 

If there is some document describing how to compile up the current Xorg I'd be
willing to give it a shot.   The world seems to have gotten more complicated
since the days of old when a "make world; make install" sufficed.

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