[Bug 93885] radeon: allow the user to set a maximum HDMI pixel clock (in MHz) by a kernel parameter

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Sun Feb 7 14:19:33 CET 2016


--- Comment #15 from Elmar Stellnberger <estellnb at elstel.org> ---
Created attachment 121572
  --> https://bugs.freedesktop.org/attachment.cgi?id=121572&action=edit
journal.log for patch001 radeon.hdmikhz=297000 radeon.hdmimhz=300

... and here comes a corresponding journal.log. If you grep the output of
drm.debug=1 you see that drm_calc_timestamping_constants seems to reduce the
frequency to 164250 kHz which is not sufficient for 3840x2160. In spite of
debugging and backtracing both function calls (drm_calc_timestamping_constants
and radeon_get_monitor_bpc) I have not found out by which function and in what
way they are called. Please help.

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